CN117187629A - Heat-treatment-free high-melting-point die-casting aluminum alloy suitable for brazing and preparation method thereof - Google Patents
Heat-treatment-free high-melting-point die-casting aluminum alloy suitable for brazing and preparation method thereof Download PDFInfo
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- 238000004512 die casting Methods 0.000 title claims abstract description 153
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 106
- 238000005219 brazing Methods 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title abstract description 34
- 239000012535 impurity Substances 0.000 claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims description 166
- 229910045601 alloy Inorganic materials 0.000 claims description 160
- 238000007670 refining Methods 0.000 claims description 37
- 229910052746 lanthanum Inorganic materials 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 35
- 229910052725 zinc Inorganic materials 0.000 claims description 35
- 239000002994 raw material Substances 0.000 claims description 34
- 229910052742 iron Inorganic materials 0.000 claims description 33
- 229910052748 manganese Inorganic materials 0.000 claims description 32
- 229910052720 vanadium Inorganic materials 0.000 claims description 30
- 238000005266 casting Methods 0.000 claims description 27
- 229910052706 scandium Inorganic materials 0.000 claims description 22
- 239000000155 melt Substances 0.000 claims description 14
- 238000003723 Smelting Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 41
- 230000008018 melting Effects 0.000 description 37
- 238000002844 melting Methods 0.000 description 37
- 238000004458 analytical method Methods 0.000 description 34
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- 229910052782 aluminium Inorganic materials 0.000 description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 30
- 238000012360 testing method Methods 0.000 description 27
- 239000000463 material Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 24
- 230000008569 process Effects 0.000 description 18
- 229910052761 rare earth metal Inorganic materials 0.000 description 18
- 150000002910 rare earth metals Chemical class 0.000 description 14
- 229910001122 Mischmetal Inorganic materials 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 11
- 238000001035 drying Methods 0.000 description 11
- 238000004626 scanning electron microscopy Methods 0.000 description 10
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- 238000009864 tensile test Methods 0.000 description 10
- 238000005728 strengthening Methods 0.000 description 8
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- 229910052684 Cerium Inorganic materials 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 239000010953 base metal Substances 0.000 description 5
- 229910018131 Al-Mn Inorganic materials 0.000 description 4
- 229910018461 Al—Mn Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 239000011159 matrix material Substances 0.000 description 4
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- 238000001938 differential scanning calorimetry curve Methods 0.000 description 3
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- 229910015136 FeMn Inorganic materials 0.000 description 2
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- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a heat treatment-free high-melting-point die-casting aluminum alloy suitable for brazing and a preparation method thereof, and relates to the field of aluminum alloys. 0.05-0.7% of Si, 1.3-3.4% of Mn, 0.7-2.4% of Fe, 0.25-0.9% of Mg, 0.06-0.28% of Ti, 0.005-0.16% of V, 0.5-3.5% of Zn, 0.003-0.016% of Hf, 0.01-2.5% of RE, RE including at least one of La/Ce/Sc, and the balance of Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%; and 0.2 < Fe: mn <2, 0.05< Si: mg <3,0.01< RE: mn <2,0.1 < Zn: mn < 2.7. The aluminum alloy can simultaneously meet the requirements of high-pressure die casting and brazing, solves the problem of brazing of the traditional die casting aluminum alloy, and greatly improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of aluminum alloy materials, in particular to a heat treatment-free high-melting-point die-casting aluminum alloy suitable for brazing and a preparation method thereof.
Background
In recent years, die-casting aluminum alloy materials are widely applied in the automobile industry, and high-vacuum die-casting technology is widely adopted for some automobile parts for a long time, but the die-casting aluminum alloy materials cannot meet the welding requirement in connection. Because of the characteristics of the cast aluminum alloy, the welding between different aluminum alloys (such as deformed aluminum alloys) can be problematic, and the weldability depends on the physical property, chemical property, metallurgical and mechanical property difference between two base metals, so that new base metals, welding wires, welding processes and the like are developed, which is an urgent problem to be solved by the application of the automobile industry.
Brazing is a welding technique in which a brazing filler metal having a melting temperature lower than that of an aluminum alloy base metal is used, and the base metal is joined together by the melted brazing filler metal at an operating temperature lower than the solidus of the base metal and higher than the liquidus of the brazing filler metal. Currently 3000 series alloys (such as AA 3003) are conventional aluminum alloys for automotive heat exchangers that can be used in almost all brazing processes, whereas the single 5000 series and 6000 series are commonly used for vacuum brazing. The automotive industry is moving towards lighter weight, and aluminum brazing has become a key technology.
At present, the common process is to weld aluminum profiles and aluminum plates after mechanical processing, but the method is time-consuming and high in cost, and is not an ideal production process. The conventional cast aluminum alloy is mainly aluminum-silicon alloy, has good casting formability but low melting point (590 ℃) of the material, has high temperature (610 ℃) during high-temperature brazing, can soften after being soaked for a period of time, is easy to generate air hole defects, cannot produce qualified products, and cannot meet the use requirement.
Disclosure of Invention
The invention aims to provide a heat treatment-free high-melting-point die-casting aluminum alloy suitable for brazing and a preparation method thereof, so as to solve the problems in the prior art.
The alloy material of the invention carries out component design and regulation again on the basis of Al-Mn series alloy, and realizes good brazability and castability through the optimization of alloy components. The Al-Mn alloy is a common deformed aluminum alloy and has the advantages of good corrosion resistance, high specific strength, good heat conduction performance and the like. Mn can prevent the recrystallization process of aluminum and aluminum alloy, raise the recrystallization temperature and obviously refine grains. The equilibrium phase diagram of the Al-Mn alloy shows that the eutectic point at 658 ℃ is 1.82%, and the eutectic intermetallic compound Al is formed 6 Mn phase is the main phase, a certain content of Mn can ensure that the alloy has better fluidity and is suitable for die casting, and the melting point of the alloy is higher than the temperature required by brazing and is suitable for brazing.
The addition of Fe to the alloy can reduce the solubility of Mn in aluminum and increase the precipitation of Mn to reduce the segregation of Mn in aluminum, but the Fe content cannot be excessive, and a coarser Al6 (FeMn) phase is easily formed, and belongs to a hard and brittle phase which is distributed in a large sheet-like manner in a structure, so that the plasticity and the strength of the alloy are reduced. Fe can also improve the fluidity of the alloy, is beneficial to demolding during die casting, and is beneficial to the die casting process.
Si is added into the system of the invention, which has little influence on the improvement of fluidity, and the intermetallic compound Al is easily formed when the content is excessive 15 (FeMn) 3 Si 2 The phase is a harmful phase, the solidus temperature can be greatly reduced, and the brazing requirement cannot be met, so that the invention strictly controls the Si content to be below 0.7%, and a large amount of second phases which are distributed in a tiny and dispersed way can be formed within a certain range by the Fe and Si content, and the toughness of the alloy can be obviously improved.
After Zn is added into the alloy, the fluidity of the alloy can be obviously improved, and MgZn phase is easy to form with Mg, so that the strength of the alloy is improved, and the mechanical property of the alloy is improved.
Mg is added into the alloy to form Mg 2 Si reinforcing phase has the effect of solid solution strengthening to improve the yield strength of the alloy, but too much addition can reduce the brazability, on one hand, because the content of Mg can greatly reduce the melting point of the alloy, and in addition, the Mg has the tendency of chemical reaction with the brazing filler metal, so that the welding quality is easily affected, and therefore, the Mg in the alloy cannot be excessively added. Ti can effectively refine grains and has improved grain compositionStrength and toughness effects of gold.
The addition of the trace element V can improve the tensile strength and the elongation of the aluminum alloy, and the V element can separate out spherical AlFeSi (Mn+V) phases in the matrix, so that the flaky iron-rich phases in the matrix are effectively reduced, and the toughness of the aluminum alloy is improved. Trace amounts of Hf form a high temperature stable compound Al with aluminum 3 Hf can better improve the heat resistance of the alloy, and as a nucleation point, improves the heterogeneous nucleation capability of the alloy, so that the alloy structure is thinned to a certain degree.
RE rare earth element has obvious strengthening effect in aluminum alloy, mainly has fine crystal strengthening, limited solid solution strengthening and second phase strengthening of rare earth compound, can improve the fluidity of the alloy, reduce the hydrogen content of aluminum alloy liquid, reduce the probability of generating gas impurity defects and play a good role in purifying aluminum liquid. The die casting is easy to cause the casting to contain gas, and the brazing process ensures that the requirement on the gas content is high in a vacuum state, and the rare earth element can be added to play a remarkable improving role.
The invention provides the following technical scheme:
one of the technical schemes of the invention is as follows: the aluminum alloy for die casting is suitable for brazing, and comprises the following components in percentage by mass:
si:0.05-0.7wt.%, mn:1.3-3.4wt.%, fe:0.7-2.4wt.%, mg:0.25-0.9wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:0.5-3.5wt.%, hf:0.003-0.016wt.%, RE:0.01-2.5wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
As a further preferred aspect of the present invention, the brazing-suitable aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.05-0.2wt.%, mn:2.7-3.4wt.%, fe:0.7-1.0wt.%, mg:0.7-0.9wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:0.5-1.5wt.%, hf:0.003-0.016wt.%, RE:2.1-2.5wt.%, RE including at least 1 or more of La, ce and Sc, the balance being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
As a further preferred aspect of the present invention, the brazing-suitable aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.21-0.5wt.%, mn:2.0-2.6wt.%, fe:1.1-2.0wt.%, mg:0.36-0.6wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:1.6-3.0wt.%, hf:0.003-0.016wt.%, RE:1.6-2.0wt.%, RE including at least 1 or more of La, ce and Sc, the balance being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
As a further preferred aspect of the present invention, the brazing-suitable aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.51-0.7wt.%, mn:1.3-1.9wt.%, fe:2.1-2.4wt.%, mg:0.25-0.35wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:3.1-3.5wt.%, hf:0.003-0.016wt.%, RE:0.01-1.5wt.%, RE including at least 1 or more of La, ce and Sc, the balance being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
As a further preferred aspect of the present invention, the brazing-suitable aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.05wt.%, mn:3.4wt.% Fe:1.0wt.%, mg:0.9wt.%, ti:0.06wt.%, V:0.16wt.% Zn:1.5wt.%, hf:0.015wt.%, RE:2.5wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
As a further preferred aspect of the present invention, the brazing-suitable aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.5wt.%, mn:2.0wt.% Fe:1.8wt.%, mg:0.36wt.%, ti:0.08wt.%, V:0.13wt.% Zn:1.6wt.%, hf:0.013wt.%, RE:2.0wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
As a further preferred aspect of the present invention, the brazing-suitable aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.7wt.%, mn:1.3wt.% Fe:2.2wt.% Mg:0.25wt.%, ti:0.12wt.%, V:0.10wt.% Zn:3.3wt.%, hf:0.012wt.%, RE:0.01wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
As a further preferred aspect of the present invention, the aluminum alloy for die casting suitable for brazing has a solidus temperature of not less than 631.15 ℃ (DSC curve analysis results show that the aluminum alloy has a solidus temperature of not less than 631.15 ℃, which is higher than that in vacuum brazing, and the alloy is suitable for brazing); the die-casting aluminum alloy for brazing has the die-casting tensile strength of more than or equal to 262MPa, the yield strength of more than or equal to 144MPa and the elongation of more than or equal to 11.2 percent.
According to the invention, the length of the test result of the die casting aluminum alloy fluidity die suitable for brazing is more than or equal to 1133mm.
The second technical scheme of the invention is as follows: the preparation method of the die-casting aluminum alloy suitable for brazing comprises the following steps: smelting raw materials according to the alloy component ratio, refining and exhausting the melt, casting to obtain an aluminum alloy ingot, and die-casting the aluminum alloy ingot to obtain the brazing aluminum alloy for die casting.
As a further preferred aspect of the present invention, the die casting conditions are: the pressure of die casting is 400-550bar, the injection speed is 4-6m/s, the vacuum degree is less than 40mbar, the die casting temperature is 690-730 ℃, and the die temperature is 200-230 ℃.
A more preferred preparation method of the invention comprises the following steps:
1) Preheating raw materials: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 740-760 ℃, adding pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE rare earth into a melting furnace for melting, cooling to 700-720 ℃ after melting, adding pure Mg, and ensuring complete melting in order to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion.
3) Refining and degassing: preserving heat at 720 ℃, adopting rotary jetting degassing equipment, introducing nitrogen with refining agent powder into the melt for powder jetting refining, wherein the adding amount of the refining agent is 0.3-0.5%, refining and degassing the melt for 8-10min, and standing for 10min after scum on the liquid surface is removed.
4) Casting ingot casting: and (5) pouring the small sample for component analysis, and pouring the qualified components into an ingot.
5) Die casting procedure: the aluminum alloy cast ingot is melted and subjected to high-pressure die casting, the die casting process is adopted, the die casting pressure is 400-550bar, the injection speed is 4-6m/s, the vacuum degree is less than 40mbar, the die casting temperature is 690-730 ℃, and the die temperature is 200-230 ℃.
The invention discloses the following technical effects:
the aluminum alloy material can simultaneously meet the requirements of high-pressure die casting and high-temperature vacuum brazing, effectively solves the problem that the traditional die casting aluminum alloy cannot be brazed, can be widely applied to the automobile manufacturing industry, and greatly improves the production efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a Scanning Electron Microscope (SEM) microstructure image of an alloy of example 9 of the invention.
FIG. 2 is a graph showing the DSC curve of the alloy of example 4 of the present invention.
FIG. 3 is a graph showing the results of the fluidity mold test of the alloy of example 1 of the present invention.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
Example 1
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.05wt.%, mn:3.4wt.% Fe:1.0wt.%, mg:0.9wt.%, ti:0.06wt.%, V:0.16wt.% Zn:1.5wt.%, hf:0.015wt.%, RE:2.5wt.% of RE is La, ce misch metal, wherein La, ce mass ratio is 4:6, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 740 ℃, adding all the raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La, ce mixed rare earth) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.5% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 10min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, adopting a die casting process to obtain die casting pressure of 550bar, and performing die casting at a die casting speed of 6m/s, a vacuum degree of 25mbar, a die casting temperature of 710 ℃ and a die temperature of 220 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 2
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.65wt.%, mn:1.9wt.% Fe:2.1wt.%, mg:0.35wt.%, ti:0.15wt.%, V:0.015wt.%, zn:3.1wt.% Hf:0.012wt.%, RE:1.5wt.% of RE is La, sc misch metal, wherein La, sc mass ratio is 5:5, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, adding all the raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La, sc misch metal) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a liquid level combustion tool and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.3% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 8min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, the aluminum alloy cast ingot is melted and subjected to high-pressure die casting, the die casting process is adopted, the die casting pressure is 550bar, the injection speed is 5.5m/s, the vacuum degree is 20mbar, the die casting temperature is 700 ℃, and the die temperature is 220 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 3
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.4wt.%, mn:2.5wt.% Fe:2.0wt.%, mg:0.45wt.%, ti:0.18wt.%, V:0.012wt.%, zn:2.5wt.%, hf:0.014wt.%, RE:0.06wt.%, RE is Ce, sc misch metal, wherein the mass ratio of Ce to Sc is 7:3, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, adding all raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (Ce, sc misch metal) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.3% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 8min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, and adopting a die casting process to obtain die casting pressure of 500bar, injection speed of 6m/s, vacuum degree of 25mbar, die casting temperature of 710 ℃ and die temperature of 220 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 4
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.51wt.%, mn:1.6wt.% Fe:2.4wt.%, mg:0.3wt.%, ti:0.28wt.%, V:0.005wt.% Zn:3.5wt.%, hf:0.003wt.%, RE:1.0wt.% of RE is La, sc misch metal, wherein La, sc mass ratio is 6:4, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 740 ℃, adding all the raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La, sc misch metal) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.5% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 10min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, adopting a die casting process to obtain die casting pressure of 500bar, injection speed of 5m/s, vacuum degree of 30mbar, die casting temperature of 690 ℃, and die temperature of 200 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 5
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.7wt.%, mn:1.3wt.% Fe:2.2wt.% Mg:0.25wt.%, ti:0.12wt.%, V:0.1wt.% Zn:3.3wt.%, hf:0.012wt.%, RE:0.01wt.% RE is La rare earth, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, adding all the raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La rare earth) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a liquid level combustion tool and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.4% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 8min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, adopting a die casting process to obtain die casting pressure of 450bar, injection speed of 6m/s, vacuum degree of 26mbar, die casting temperature of 700 ℃ and die temperature of 230 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 6
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.5wt.%, mn:2.0wt.% Fe:1.8wt.%, mg:0.36wt.%, ti:0.08wt.%, V:0.13wt.% Zn:1.6wt.%, hf:0.013wt.%, RE:2.0wt.% of RE is La, ce and Sc mixed rare earth, wherein the mass ratio of La, ce and Sc is 3:5:2, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, adding all raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La, ce and Sc mixed rare earth) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.5% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 10min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: the aluminum alloy cast ingot is melted and then subjected to high-pressure die casting, the aluminum alloy cast ingot is melted and subjected to high-pressure die casting, the die casting process is adopted, the die casting pressure is 400bar, the injection speed is 4.5m/s, the vacuum degree is 30mbar, the die casting temperature is 710 ℃, and the die temperature is 210 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 7
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.08wt.%, mn:3.0wt.% Fe:0.9wt.%, mg:0.8wt.%, ti:0.25wt.%, V:0.008wt.% Zn:1.0wt.%, hf:0.015wt.%, RE:2.3wt.% of RE is Ce and Sc mixed rare earth, wherein the mass ratio of Ce to Sc is 7:3, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 740 ℃, adding all the raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (Ce, sc misch metal) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.4% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 10min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, adopting a die casting process to obtain die casting pressure of 550bar, and performing injection speed of 6m/s, vacuum degree of 20mbar, die casting temperature of 710 ℃ and die temperature of 200 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 8
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.21wt.%, mn:2.6wt.% Fe:1.1wt.% Mg:0.6wt.%, ti:0.19wt.%, V:0.016wt.%, zn:3.0wt.%, hf:0.016wt.%, RE:1.6wt.% of RE is Ce and Sc mixed rare earth, wherein the mass ratio of Ce to Sc is 8:2, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, adding all raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (Ce, sc misch metal) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.5% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 10min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, adopting a die casting process to obtain die casting pressure of 500bar, injection speed of 5m/s, vacuum degree of 30mbar, die casting temperature of 700 ℃ and die temperature of 200 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 9
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, mg:0.7wt.%, ti:0.13wt.%, V:0.008wt.% Zn:0.5wt.%, hf:0.008wt.%, RE:2.1wt.% of RE is La, ce misch metal, wherein La, ce mass ratio is 4:6, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 740 ℃, adding all the raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La, ce mixed rare earth) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.4% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 8min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, adopting a die casting process to obtain a die casting pressure of 450bar, a die casting speed of 6m/s, a vacuum degree of 25mbar, a die casting temperature of 710 ℃ and a die temperature of 210 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Example 10
The embodiment relates to a brazing heat treatment-free aluminum alloy for die casting, which comprises the following components in percentage by mass:
si:0.35wt.%, mn:2.5wt.% Fe:1.5wt.%, mg:0.5wt.%, ti:0.08wt.%, V:0.14wt.% Zn:2.0wt.%, hf:0.015wt.%, RE:1.8wt.% of RE is La, ce and Sc mixed rare earth, wherein the mass ratio of La, ce and Sc is 5:3:2, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy comprises the following steps:
1) Material preparation and preheating: preparing materials according to the alloy component proportion, preheating the raw materials to be melted to 200 ℃ and drying.
2) Alloy smelting: heating to 740 ℃, adding all raw materials with calculated proportion into a furnace, melting the raw materials including pure aluminum, pure Zn, al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy and RE (La, ce and Sc mixed rare earth) alloy, and adding pure Mg when the alloy is melted and cooled to 720 ℃, so as to prevent the Mg from being pressed into the bottom of a crucible by a tool for liquid level combustion and ensure complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.5% of refining agent into the aluminum liquid, degassing the melt by using argon-introducing rotary powder-spraying refining degassing equipment for 10min, and standing for 10min after removing scum on the liquid surface.
4) Casting ingot casting: pouring the small sample for spectral component analysis, and pouring into ingots after the components are qualified.
5) Die casting procedure: and (3) melting the aluminum alloy cast ingot, performing high-pressure die casting, and adopting a die casting process to obtain die casting pressure of 500bar, a die casting speed of 5.5m/s, a vacuum degree of 25mbar, a die casting temperature of 710 ℃ and a die temperature of 230 ℃.
6) The die casting die is a die for testing the fluidity of a flat die, and mechanical property testing is carried out by taking a tensile test piece on a die casting flat die casting body, and fluidity is synchronously measured. The flat plate mold body was sampled for SEM scanning electron microscopy for microstructure analysis and for solidus temperature analysis by DSC differential thermal scanner.
Comparative example 1
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, mg:0.7wt.%, ti:0.13wt.% Zn:0.5wt.%, hf:0.008wt.% of Al and unavoidable impurities, the balance being less than or equal to 0.2% of total impurities.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Comparative example 2
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, mg:0.7wt.%, ti:0.13wt.%, V:0.008wt.% Zn:0.5wt.% of Al and unavoidable impurities, the balance being less than or equal to 0.2% of total impurities.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Comparative example 3
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, ti:0.13wt.%, V:0.008wt.% Hf:0.008wt.% of Al and unavoidable impurities, the balance being less than or equal to 0.2% of total impurities.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Comparative example 4
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, ti:0.13wt.% Zn:0.5wt.%, RE:2.1wt.% of RE is La, ce misch metal, wherein La, ce mass ratio is 4:6, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Comparative example 5
The aluminum alloy of the comparative example comprises the following components in percentage by mass:
si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, ti:0.13wt.%, V:0.008wt.%, RE:2.1wt.% of RE is La, ce misch metal, wherein La, ce mass ratio is 4:6, the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Comparative example 6
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, mg:0.7wt.%, ti:0.13wt.% of Al and unavoidable impurities, the balance being less than or equal to 0.2% of total impurities.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Comparative example 7
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.2wt.% Mn:2.7wt.% Fe:0.7wt.%, ti:0.13wt.% of Al and unavoidable impurities, the balance being less than or equal to 0.2% of total impurities.
The preparation method of the aluminum alloy of this comparative example is the same as in example 9.
Table 1 (mass fraction wt.%)
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Table 2 (mechanical Properties, solidus temperature, flowability)
Table 1 shows the mass fractions of the aluminum alloy materials of examples 1 to 10 and comparative examples 1 to 7, and Table 2 shows the mechanical properties, solidus temperature and fluidity test results of the die-cast aluminum alloys corresponding to Table 1. According to the analysis of the results of each example and comparative example in the above tables 1 and 2, it is shown by comparing example 9 with comparative examples 1 to 7 that when the elements of Mg, V, zn, hf, RE rare earth are not added into the alloy, the mechanical properties of the alloy are greatly reduced, the solidus temperature is reduced and the fluidity is poor, which indicates that when Mg, V, zn, hf, RE rare earth is added into an aluminum matrix according to a certain proportion, the synergistic strengthening effect is achieved, the tensile strength, the yield strength and the elongation of the alloy can be effectively improved, and the effect of stabilizing the mechanical properties of the alloy is achieved.
Fig. 1 is a Scanning Electron Microscope (SEM) microstructure image of the alloy of example 9 of the present invention, in which the microstructure morphology of the alloy of the present invention is observed, and in the alpha-Al matrix, there are a network-distributed Al rare earth phase, a square AlMnFe phase, and a dispersed particulate MgSi phase, and it is observed that the second phase distribution is relatively uniform, and a better strengthening effect is achieved. FIG. 2 is a graph of DSC curve analysis results of the alloy of example 4 of the present invention, and the test results show that the solidus temperature of the alloy is 631.15 ℃, which is higher than 610 ℃ in the conventional vacuum brazing process, and can meet the use requirements of the brazing aluminum alloy. Fig. 3 is a graph of the test results of the fluidity mold of the alloy of example 1 according to the present invention, and the test shows that the fluidity of the alloy is good, and the material has good die casting performance.
In summary, the invention optimizes the alloy composition based on Al-Mn series alloy, and by adding Si, fe, mg, zn, V, ti and trace element Hf and RE rare earth element in a certain proportion, RE comprises at least 1 or more of La/Ce/Sc. The toughening mechanism of various elements is exerted to the maximum extent, the elements play a synergistic strengthening role, and high mechanical properties can be achieved without heat treatment so as to meet the use requirements. In the range of the alloy system, the solidus temperature of the aluminum alloy is effectively improved on the basis of ensuring good mechanical properties by regulating the element proportion, and the result shows that the solidus temperature of the alloy is greatly higher than the brazing temperature, thereby completely meeting the practical requirements, and the alloy has good fluidity and is suitable for high-pressure casting. In conclusion, the alloy has excellent brazeability and good castability, not only effectively solves the problem of low melting point of the aluminum alloy for brazing in the current industry, but also effectively couples the die casting technology and the brazing technology to achieve the aim of improving the efficiency of production links, and therefore, the alloy has very wide application prospect in the future automobile production field.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. The die-casting aluminum alloy suitable for brazing is characterized by comprising the following components in percentage by mass:
si:0.05-0.7wt.%, mn:1.3-3.4wt.%, fe:0.7-2.4wt.%, mg:0.25-0.9wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:0.5-3.5wt.%, hf:0.003-0.016wt.%, RE:0.01-2.5wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
2. The aluminum alloy for die casting suitable for brazing according to claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.05-0.2wt.%, mn:2.7-3.4wt.%, fe:0.7-1.0wt.%, mg:0.7-0.9wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:0.5-1.5wt.%, hf:0.003-0.016wt.%, RE:2.1-2.5wt.%, RE including at least 1 or more of La, ce and Sc, the balance being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
3. The aluminum alloy for die casting suitable for brazing according to claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.21-0.5wt.%, mn:2.0-2.6wt.%, fe:1.1-2.0wt.%, mg:0.36-0.6wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:1.6-3.0wt.%, hf:0.003-0.016wt.%, RE:1.6-2.0wt.%, RE including at least 1 or more of La, ce and Sc, the balance being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
4. The aluminum alloy for die casting suitable for brazing according to claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.51-0.7wt.%, mn:1.3-1.9wt.%, fe:2.1-2.4wt.%, mg:0.25-0.35wt.%, ti:0.06-0.28wt.%, V:0.005-0.16wt.%, zn:3.1-3.5wt.%, hf:0.003-0.016wt.%, RE:0.01-1.5wt.%, RE including at least 1 or more of La, ce and Sc, the balance being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein, the mass percentage content of Fe and Mn satisfies: fe is more than 0.2 and Mn is more than 2; the mass percentage content of Si and Mg is as follows: 0.05< Si: mg <3; the mass percentage content of RE and Mn is as follows: 0.01< RE: mn <2; the mass percentage content of Zn and Mn is as follows: zn is more than 0.1 and Mn is more than 2.7.
5. The aluminum alloy for die casting suitable for brazing according to claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.05wt.%, mn:3.4wt.% Fe:1.0wt.%, mg:0.9wt.%, ti:0.06wt.%, V:0.16wt.% Zn:1.5wt.%, hf:0.015wt.%, RE:2.5wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
6. The aluminum alloy for die casting suitable for brazing according to claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.5wt.%, mn:2.0wt.% Fe:1.8wt.%, mg:0.36wt.%, ti:0.08wt.%, V:0.13wt.% Zn:1.6wt.%, hf:0.013wt.%, RE:2.0wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
7. The aluminum alloy for die casting suitable for brazing according to claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.7wt.%, mn:1.3wt.% Fe:2.2wt.% Mg:0.25wt.%, ti:0.12wt.%, V:0.10wt.% Zn:3.3wt.%, hf:0.012wt.%, RE:0.01wt.%, RE comprises at least 1 or more of La, ce and Sc, and the balance is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%.
8. The aluminum alloy for die casting suitable for brazing according to any one of claims 1 to 7, wherein the aluminum alloy for die casting suitable for brazing has a solidus temperature of not less than 631.15 ℃; the die-casting aluminum alloy for brazing has the die-casting tensile strength of more than or equal to 262MPa, the yield strength of more than or equal to 144MPa and the elongation of more than or equal to 11.2 percent.
9. A method for producing an aluminum alloy for die casting suitable for brazing as recited in any one of claims 1 to 8, comprising the steps of: smelting raw materials according to the alloy component ratio, refining and exhausting the melt, casting to obtain an aluminum alloy ingot, and die-casting the aluminum alloy ingot to obtain the brazing aluminum alloy for die casting.
10. The method according to claim 9, wherein the die casting conditions are: the pressure of die casting is 400-550bar, the injection speed is 4-6m/s, the vacuum degree is less than 40mbar, the die casting temperature is 690-730 ℃, and the die temperature is 200-230 ℃.
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