CN117187628A - Brazing heat treatment-free aluminum alloy for die casting and preparation method thereof - Google Patents
Brazing heat treatment-free aluminum alloy for die casting and preparation method thereof Download PDFInfo
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- 238000004512 die casting Methods 0.000 title claims abstract description 146
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 107
- 238000005219 brazing Methods 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 32
- 239000000956 alloy Substances 0.000 claims abstract description 157
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 151
- 239000012535 impurity Substances 0.000 claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 32
- 229910052720 vanadium Inorganic materials 0.000 claims description 28
- 238000005266 casting Methods 0.000 claims description 26
- 229910052746 lanthanum Inorganic materials 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 229910052727 yttrium Inorganic materials 0.000 claims description 23
- 239000000155 melt Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 238000003723 Smelting Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- 238000002844 melting Methods 0.000 description 59
- 230000008018 melting Effects 0.000 description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 39
- 229910052782 aluminium Inorganic materials 0.000 description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 38
- 239000007788 liquid Substances 0.000 description 31
- 238000004458 analytical method Methods 0.000 description 30
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- 229910018520 Al—Si Inorganic materials 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 238000001035 drying Methods 0.000 description 10
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- 238000009864 tensile test Methods 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 6
- 239000010953 base metal Substances 0.000 description 5
- 230000000694 effects Effects 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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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 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 brazing heat treatment-free aluminum alloy for die casting and a preparation method thereof, and relates to the field of aluminum alloys. The alloy comprises, by mass, 0.05-0.6% of Si, 0.9-3.2% of Mn, 0.6-2.5% of Fe, 0.2-0.8% of Mg, 0.03-0.3% of Ti, 0.01-0.2% of V, 0.01-0.03% of Ga, 0.003-0.018% of Hf, 0.001-0.03% of Bi, 0.5-6.5% of RE, at least one of La/Ce/Y, the balance of Al and unavoidable impurities, the total amount of impurities is less than or equal to 0.2%, fe is less than Mn and less than 3.0%, si is less than 0.06< Mg and less than 3.5%, RE is less than 0.15< Mn and less than 7.5%. The aluminum alloy can meet the requirements of brazing and high-pressure die casting, solves the problem that die casting aluminum alloy cannot be brazed, and has good development prospect in the automobile manufacturing industry.
Description
Technical Field
The invention relates to the technical field of aluminum alloy materials, in particular to a braze-welded heat-treatment-free aluminum alloy for die casting 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 brazing heat treatment-free aluminum alloy for die casting 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 reduces the solubility of Mn in aluminum, increases Mn precipitation to reduce Mn segregation in aluminum, but the Fe content is not excessive, so that coarser Al is easily formed 6 (FeMn) phase, which belongs to hard and brittle phase and is distributed in a large flake shape in a structure, reduces the plasticity and strength of the alloy. 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 0.6%, 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.
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.
The addition of trace V can improve the tensile strength and the elongation of the aluminum alloy, and the V 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. Ti can effectively refine grains and has the function of improving the strength and toughness of the alloy.
The addition of trace Ga can promote the precipitation of Mg at the grain boundary, thereby promoting the strengthening phase Mg 2 The precipitation of Si can effectively improve the mechanical property of the alloy. 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. The trace Bi can improve the machining performance of castings and improve the wear resistance to a certain extent.
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 brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.05-0.6wt.%, mn:0.9-3.2wt.%, fe:0.6-2.5wt.%, mg:0.2-0.8wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.01-0.03wt.%, hf:0.003-0.018wt.%, 0.001-0.03wt.% Bi, 0.5-6.5wt.% RE, wherein RE comprises at least 1 or more of La, ce and Y, and the balance Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
As a further preferred aspect of the present invention, the brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.05-0.24wt.%, mn:2.7-3.2wt.%, fe:0.6-1.0wt.%, mg:0.66-0.8wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.01-0.015wt.%, hf:0.003-0.018wt.%, bi:0.001-0.03wt.%, RE:5.3-6.5wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
As a further preferred aspect of the present invention, the brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.25-0.55wt.%, mn:1.3-2.6wt.%, fe:1.1-2.0wt.%, mg:0.36-0.65wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.016-0.025wt.%, hf:0.003-0.018wt.%, bi:0.001-0.03wt.%, RE:1.9-5.2wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
As a further preferred aspect of the present invention, the brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.56-0.6wt.%, mn:0.9-1.2wt.%, fe:2.1-2.5wt.%, mg:0.2-0.35wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.026-0.03wt.%, hf:0.003-0.018wt.%, bi:0.001-0.03wt.%, RE:0.5-1.8wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
As a further preferred aspect of the present invention, the brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.08wt.%, mn:2.7wt.% Fe:0.6wt.%, mg:0.8wt.%, ti:0.03wt.%, V:0.1wt.%, ga:0.01wt.%, hf:0.012wt.%, bi:0.025wt.%, RE:5.3wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
As a further preferred aspect of the present invention, the brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, mg:0.55wt.%, ti:0.25wt.%, V:0.016wt.%, ga:0.02wt.%, hf:0.018wt.%, bi:0.01wt.%, RE:4.5wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
As a further preferred aspect of the present invention, the brazing aluminum alloy for die casting comprises the following components in percentage by mass:
si:0.6wt.%, mn:0.9wt.% Fe:2.5wt.%, mg:0.2wt.%, ti:0.2wt.%, V:0.09wt.%, ga:0.03wt.%, hf:0.015wt.%, bi:0.008wt.%, RE:0.5wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
As a further preferred aspect of the present invention, the die-casting brazable aluminum alloy has a solidus temperature of at least 639.85 ℃ (DSC curve analysis results show that the solidus temperature of the aluminum alloy is at least 639.85 ℃, which is higher than the vacuum brazing temperature, indicating that the aluminum alloy is suitable for brazing); the die-casting state tensile strength of the brazing aluminum alloy for die casting is more than or equal to 267MPa, the yield strength is more than or equal to 145MPa, and the elongation is more than or equal to 11.6%.
In the invention, the length of the test result of the fluidity die of the aluminum alloy is more than or equal to 1130mm.
The second technical scheme of the invention is as follows: the preparation method of the brazing aluminum alloy for die casting 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 450-600bar, the injection speed is 4.5-6.5m/s, the vacuum degree is less than 40mbar, the die casting temperature is 700-730 ℃, 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 200-220 ℃ and drying.
2) Alloy smelting: heating to 740-760 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 700-720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the Mg from being burnt on the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring to ensure complete melting.
3) Refining and degassing: preserving heat at 720-730 ℃, 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 0.2-0.5%, 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 450-600bar, the injection speed is 4.5-6.5m/s, the vacuum degree is less than 40mbar, the die casting temperature is 700-730 ℃, 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 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 2 of the present invention.
FIG. 2 is a graph showing the DSC curve of the alloy of example 5 of the present invention.
Fig. 3 is a graph showing the results of the flow mold test for the alloy of example 1 ((1)), example 5 ((2)), and example 3 ((3)) according to 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:3.2wt.% Fe:1.0wt.%, mg:0.7wt.%, ti:0.22wt.%, V:0.18wt.%, ga:0.015wt.%, hf:0.018wt.%, bi:0.018wt.%, RE:6.5wt.% of RE is La, ce and Y mixed rare earth, wherein the mass ratio of La, ce and Y is 4:5:1, 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, then respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible in order to prevent the Mg from being burnt on the liquid surface, finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible for melting and stirring, and ensuring 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 9min, 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, injection speed of 6m/s, vacuum degree of 20mbar, die casting temperature of 710 ℃ 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 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:0.25wt.%, mn:2.6wt.% Fe:2.0wt.%, mg:0.65wt.%, ti:0.3wt.%, V:0.2wt.%, ga:0.025wt.%, hf:0.003wt.%, bi:0.015wt.%, RE:5.2wt.% 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 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 450bar, the injection speed is 6.5m/s, the vacuum degree is 25mbar, the die casting temperature is 700 ℃, 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 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:0.08wt.%, mn:2.7wt.% Fe:0.6wt.%, mg:0.8wt.%, ti:0.03wt.%, V:0.1wt.%, ga:0.01wt.%, hf:0.012wt.%, bi:0.025wt.%, RE:5.3wt.% of RE is La, ce misch metal, wherein La, ce 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring complete melting.
3) Refining and degassing: preserving heat at 720 ℃, adding 0.2% 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 30mbar, the die casting temperature is 720 ℃, 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 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:0.56wt.%, mn:1.2wt.% Fe:2.1wt.%, mg:0.35wt.%, ti:0.18wt.%, V:0.01wt.%, ga:0.026wt.%, hf:0.016wt.%, bi:0.006wt.%, RE:1.8wt.% of 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the Mg from being burnt on the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 9min, 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 600bar, the injection speed is 6.5m/s, the vacuum degree is 25mbar, the die casting temperature is 730 ℃, and the die temperature is 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 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:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, mg:0.55wt.%, ti:0.25wt.%, V:0.016wt.%, ga:0.02wt.%, hf:0.018wt.%, bi:0.01wt.%, RE:4.5wt.% of RE is Ce and Y mixed rare earth, wherein the mass ratio of Ce to Y 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 9min, 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 500bar, the injection speed is 4.5m/s, the vacuum degree is 35mbar, the die casting temperature is 700 ℃, and the die temperature is 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 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:0.24wt.%, mn:3.0wt.% Fe:0.9wt.%, mg:0.66wt.%, ti:0.05wt.%, V:0.19wt.%, ga:0.014wt.%, hf:0.009wt.%, bi:0.028wt.%, RE:6.0wt.% of rare earth La, ce and Y, wherein the mass ratio of La, ce and Y is 4:5:1, 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 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 a die casting pressure of 600bar, a die casting speed of 5m/s, a vacuum degree of 25mbar, a die casting temperature of 720 ℃ 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 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:0.58wt.%, mn:1.1wt.% Fe:2.3wt.% Mg:0.3wt.%, ti:0.15wt.%, V:0.005wt.%, ga:0.028wt.%, hf:0.01wt.%, bi:0.015wt.%, RE:1.5wt.% 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 9min, 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 590bar, the injection speed is 6.5m/s, the vacuum degree is 25mbar, the die casting temperature is 730 ℃, and the die temperature is 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:0.55wt.%, mn:1.3wt.% Fe:1.1wt.% Mg:0.36wt.%, ti:0.09wt.%, V:0.12wt.%, ga:0.016wt.%, hf:0.014wt.%, bi:0.002wt.%, RE:1.9wt.% of RE is La, ce mixed rare earth, wherein the mass ratio of La to Ce 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 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, and performing die casting at a die casting speed of 4.5m/s, a vacuum degree of 20mbar and 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.
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:0.6wt.%, mn:0.9wt.% Fe:2.5wt.%, mg:0.2wt.%, ti:0.2wt.%, V:0.09wt.%, ga:0.03wt.%, hf:0.015wt.%, bi:0.008wt.%, RE:0.5wt.% of RE is La, ce and Y mixed rare earth, wherein the mass ratio of La, ce and Y is 6:3:1, 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 220 ℃ and drying.
2) Alloy smelting: heating to 750 ℃, firstly melting pure aluminum, respectively adding Al-Si intermediate alloy, al-Mn intermediate alloy, al-Fe intermediate alloy, al-Ti intermediate alloy, al-V intermediate alloy, al-Hf intermediate alloy, al-Bi intermediate alloy and RE rare earth alloy for melting, cooling to 720 ℃ after melting, adding pure Mg, pressing the Mg into the bottom of a crucible by a tool for preventing the burning of the liquid surface, and finally pressing the Ga wrapped by aluminum foil into the bottom of the crucible by the tool for melting and stirring, thereby ensuring 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 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 600bar, a die casting speed of 6m/s, a vacuum degree of 20mbar, a die casting temperature of 720 ℃ 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:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, ti:0.25wt.%, V:0.016wt.%, hf:0.018wt.%, bi:0.01wt.%, RE:4.5wt.% of RE is Ce and Y mixed rare earth, wherein the mass ratio of Ce to Y 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 of this comparative example is the same as in example 5.
Comparative example 2
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, ti:0.25wt.%, V:0.016wt.%, ga:0.02wt.%, bi:0.01wt.%, RE:4.5wt.% of RE is Ce and Y mixed rare earth, wherein the mass ratio of Ce to Y 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 of this comparative example is the same as in example 5.
Comparative example 3
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, ti:0.25wt.%, ga:0.02wt.%, hf:0.018wt.%, bi:0.01wt.% 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 5.
Comparative example 4
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, mg:0.55wt.%, ti:0.25wt.%, bi:0.01wt.% 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 5.
Comparative example 5
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, mg:0.55wt.%, ti:0.25wt.%, ga:0.02wt.%, balance Al and unavoidable impurities, wherein the total amount of impurities is not more than 0.2%.
The preparation method of the aluminum alloy of this comparative example is the same as in example 5.
Comparative example 6
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, mg:0.55wt.%, ti:0.25wt.% of Bi, 0.01wt.% of 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 of this comparative example is the same as in example 5.
Comparative example 7
The aluminum alloy of the comparative example comprises the following components in percentage by mass: si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.% 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 5.
Table 1 (mass fraction wt.%)
Table 2 (mechanical Properties, solidus temperature, flowability)
Table 1 shows the mass fractions of the aluminum alloy materials of examples 1 to 9 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 comparative analysis of the results of the examples and comparative examples in the above tables 1 and 2, the comparison of the example 5 and the comparative examples 1 to 7 shows that when the Mg, V, ga, hf, bi, RE rare earth elements 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, ga, hf, bi, 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 2 of the present invention, and it can be observed that the microstructure morphology phase of the alloy of the present invention is that the gray block in the alloy matrix structure is AlMnFe phase, the bright white stripe is Al rare earth phase, and the dispersed particles are MgSi phase, and these second phases are uniformly dispersed, have good morphology, and play a key role in improving the mechanical properties of the alloy. FIG. 2 is a graph of DSC curve analysis results of the alloy of example 5 of the present invention, and the test results show that the solidus temperature of the alloy is 644.03 ℃, which is higher than the temperature 610 ℃ during general vacuum brazing, and can meet the use requirements of the brazing aluminum alloy. Fig. 3 is a graph showing the results of the flow mold test for the alloys of example 1 ((1)), example 5 ((2)), and example 3 ((3)) according to the present invention, and the test shows that the alloys have good flow properties and good die-casting properties.
In conclusion, the invention optimizes the alloy components based on the Al-Mn series alloy, and the toughening mechanism of various elements is furthest exerted by adding Si, fe, mg, V, ti and trace elements Hf, ga, bi and RE rare earth elements according to a certain proportion, and the elements play a synergistic strengthening role mutually, so that the high mechanical property can be achieved without heat treatment. In the alloy system range, the inventor aims at improving the solidus temperature of the aluminum alloy on the basis of ensuring the mechanical property by regulating the proportion of elements, and the result shows that the solidus temperature of the alloy is greatly higher than the brazing temperature, thereby completely meeting the practical requirement, 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 brazing aluminum alloy for die casting is characterized by comprising the following components in percentage by mass:
si:0.05-0.6wt.%, mn:0.9-3.2wt.%, fe:0.6-2.5wt.%, mg:0.2-0.8wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.01-0.03wt.%, hf:0.003-0.018wt.%, 0.001-0.03wt.% Bi, 0.5-6.5wt.% RE, wherein RE comprises at least 1 or more of La, ce and Y, and the balance Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
2. The die casting brazing aluminum alloy as claimed in claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.05-0.24wt.%, mn:2.7-3.2wt.%, fe:0.6-1.0wt.%, mg:0.66-0.8wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.01-0.015wt.%, hf:0.003-0.018wt.%, bi:0.001-0.03wt.%, RE:5.3-6.5wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
3. The die casting brazing aluminum alloy as claimed in claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.25-0.55wt.%, mn:1.3-2.6wt.%, fe:1.1-2.0wt.%, mg:0.36-0.65wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.016-0.025wt.%, hf:0.003-0.018wt.%, bi:0.001-0.03wt.%, RE:1.9-5.2wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
4. The die casting brazing aluminum alloy as claimed in claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.56-0.6wt.%, mn:0.9-1.2wt.%, fe:2.1-2.5wt.%, mg:0.2-0.35wt.%, ti:0.03-0.3wt.%, V:0.01-0.2wt.%, ga:0.026-0.03wt.%, hf:0.003-0.018wt.%, bi:0.001-0.03wt.%, RE:0.5-1.8wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2%;
wherein the mass percentage content ratio of Fe to Mn is as follows: fe is more than 0.18 and Mn is less than 3.0; the mass percentage content ratio of Si to Mg is as follows: 0.06< Si: mg <3.5; the mass percentage content ratio of RE to Mn is as follows: 0.15< RE: mn <7.5.
5. The die casting brazing aluminum alloy as claimed in claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.08wt.%, mn:2.7wt.% Fe:0.6wt.%, mg:0.8wt.%, ti:0.03wt.%, V:0.1wt.%, ga:0.01wt.%, hf:0.012wt.%, bi:0.025wt.%, RE:5.3wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
6. The die casting brazing aluminum alloy as claimed in claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.45wt.%, mn:2.1wt.% Fe:1.8wt.%, mg:0.55wt.%, ti:0.25wt.%, V:0.016wt.%, ga:0.02wt.%, hf:0.018wt.%, bi:0.01wt.%, RE:4.5wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
7. The die casting brazing aluminum alloy as claimed in claim 1, wherein the alloy comprises the following components in percentage by mass:
si:0.6wt.%, mn:0.9wt.% Fe:2.5wt.%, mg:0.2wt.%, ti:0.2wt.%, V:0.09wt.%, ga:0.03wt.%, hf:0.015wt.%, bi:0.008wt.%, RE:0.5wt.%; RE comprises at least 1 or more of La, ce and Y, and the balance of Al and unavoidable impurities, wherein the total amount of the impurities is less than or equal to 0.2 percent.
8. The die casting brazable aluminum alloy of any one of claims 1-7, wherein the die casting brazable aluminum alloy has a solidus temperature of greater than or equal to 639.85 ℃; the die-casting state tensile strength of the brazing aluminum alloy for die casting is more than or equal to 267MPa, the yield strength is more than or equal to 145MPa, and the elongation is more than or equal to 11.6%.
9. A method for producing a brazeable aluminum alloy for die casting according to 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 450-600bar, the injection speed is 4.5-6.5m/s, the vacuum degree is less than 40mbar, the die casting temperature is 700-730 ℃, and the die temperature is 200-230 ℃.
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| CN118081179A (en) * | 2024-04-26 | 2024-05-28 | 龙门实验室 | Amorphous aluminum silicon-based brazing filler metal and preparation method and brazing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102978472A (en) * | 2012-11-09 | 2013-03-20 | 安徽欣意电缆有限公司 | Al-Fe-Bi-RE aluminum alloy, and preparation method and power cable thereof |
| WO2022139007A1 (en) * | 2020-12-22 | 2022-06-30 | 주식회사 에프티넷 | Aluminum alloy for high-toughness casting and manufacturing method therefor |
| CN116574944A (en) * | 2023-05-10 | 2023-08-11 | 山西瑞格金属新材料有限公司 | Heat treatment-free aluminum alloy for new energy automobile battery pack and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102978472A (en) * | 2012-11-09 | 2013-03-20 | 安徽欣意电缆有限公司 | Al-Fe-Bi-RE aluminum alloy, and preparation method and power cable thereof |
| WO2022139007A1 (en) * | 2020-12-22 | 2022-06-30 | 주식회사 에프티넷 | Aluminum alloy for high-toughness casting and manufacturing method therefor |
| CN116574944A (en) * | 2023-05-10 | 2023-08-11 | 山西瑞格金属新材料有限公司 | Heat treatment-free aluminum alloy for new energy automobile battery pack and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118081179A (en) * | 2024-04-26 | 2024-05-28 | 龙门实验室 | Amorphous aluminum silicon-based brazing filler metal and preparation method and brazing method thereof |
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