CN110157959A - A kind of pack alloy of high-intensity and high-tenacity and preparation method thereof - Google Patents
A kind of pack alloy of high-intensity and high-tenacity and preparation method thereof Download PDFInfo
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- CN110157959A CN110157959A CN201910546570.3A CN201910546570A CN110157959A CN 110157959 A CN110157959 A CN 110157959A CN 201910546570 A CN201910546570 A CN 201910546570A CN 110157959 A CN110157959 A CN 110157959A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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Abstract
The present invention provides pack alloys of a kind of high-intensity and high-tenacity and preparation method thereof, are related to metal material field.The pack alloy of the high-intensity and high-tenacity, its chemical component includes: that the content of Si is 9.0-12.0% by mass percentage, the content of Zn is 8.0-12.0%, the content of Mg is 0.3-0.5%, and the content of Fe is 0.2-0.5%, and the content of Mn is 0.3-0.65%, the content of RE is 0.05-0.1%, the content of B is 0.01-0.03%, and impurity content≤0.15%, remaining is Al.The alloy has drawn the advantages of Al-Si series and Al-Zn series alloy, has the characteristics that good casting property, feeding capacity are strong, thermal expansion coefficient is small and intensity is high, good from strengthening effect, is suitable for die-casting process production.
Description
Technical field
The present invention relates to metal material fields, pack alloy and its preparation more particularly, to a kind of high-intensity and high-tenacity
Method.
Background technique
As automobile fuel efficiency and energy-saving and environment-friendly requirement are continuously improved, lightweight has become a weight of auto industry
Want one of developing direction.Existing research shows that can effectively mitigate the weight of automobile using light-weight high-strength material.Aluminium alloy have than
Intensity, specific stiffness are high, processing forming is good, can 100% recycling the advantages that, become one of ideal material of automotive light weight technology.According to
Statistics, it is 150 kilograms or so that each passenger car, which averagely uses aluminum amount, and wherein aluminium alloy castings account for about the 77% of automobile aluminum amount, and
Die casting accounts for 85% or more of casting total amount.The intensity of common die casting is lower, exists in the prior art and utilizes solution heat treatment
Mode to promote its intensity, but during heat treatment, the surface of die casting will form bubbling, influence surface quality of continuous castings
And dimensional accuracy.It can thus be appreciated that common die casting generallys use heat treatment raising mechanical castings, the effect is unsatisfactory, casting
Part performance is not generally high, limited come the effect of loss of weight by Optimal Structure Designing, develops a kind of height that obstructed Overheating Treatment is strengthened
The die-cast aluminum alloy material of performance is very necessary.
Currently, traditional pack alloy mainly includes two series of Al-Si system and Al-Mg system, wherein YL114
(YZAlSi9Cu4) performance is best, tensile strength >=320MPa, elongation percentage >=3.5%.
Patent CN101914709B discloses a kind of high-toughness casting aluminum alloy, the main component of alloy are as follows: Mg
9.5%-11.0%, Ti 0.1%-0.4%, RE 0.1%-0.3%, Si 0.15%-0.30%, obtained casting pass through
Intensity is more than 300MPa after solid solution and timeliness, and elongation reaches 8.6% or more.
Patent CN108034870A discloses a kind of pack alloy of high-strength and high ductility, the quality point of alloy composition
Number is Si:8.0-9.0%, Mg:0.2-0.3%, Mn:0.3-0.5%, Cu:0.1-0.2%, Fe:0.15-0.2%, Y:
0.4-0.6%, Er:0.2-0.3%, Ti:0.01-0.02%, B:0.03-0.06%, surplus Al.The die casting of acquisition is closed
Golden tensile strength >=300MPa, elongation percentage >=6%.
Patent CN103243245A discloses a kind of high-intensitive and high-plasticity die-cast aluminum alloy material, the chemistry of the alloy material
At being grouped as including Si:11.0-12.0%, Fe:0.2%；Cu:0.2%；Mn:0.5-0.8%；Mg:0.1%；Zn:
0.5%；Ti:0.1-0.2%；Al: surplus.Tensile strength can reach 328MPa, yield strength under the alloy die cast state
150-170MPa, elongation are more than 5.0%.
In above-mentioned high-toughness casting aluminum alloy, Cu content is high in YL114, and hot cracking tendency is big；Patent CN101914709B is
Al-Mg series cast aluminium alloy gold, melt is easy scaling loss when Mg content is higher, the defects of oxide inclusion easily occurs.Patent
Y, Er rare precious metal content in CN108034870A is higher, higher cost.The yield strength of patent CN103243245A alloy
It is relatively low, using limited.
In consideration of it, special propose the application.
Summary of the invention
The purpose of the present invention is to provide a kind of pack alloy of high-intensity and high-tenacity, the high, thermal conductivity with intensity
Good, the with higher toughness of energy, is suitable for die-casting process.
Another object of the present invention is to provide a kind of preparation method of the pack alloy of high-intensity and high-tenacity, the preparations
Method is simple, obtains without being heat-treated by high temperature solid solution, reduces process, energy saving.
The embodiment of the present invention adopts the following technical scheme that realization:
The embodiment of the invention provides a kind of pack alloys of high-intensity and high-tenacity, and chemical component is by weight percent
Meter includes: that the content of Si is 9.0-12.0%, and the content of Zn is 8.0-12.0%, and the content of Mg is 0.3-0.5%, Fe's
Content is 0.2-0.5%, and the content of Mn is 0.3-0.65%, and the content of RE is 0.05-0.1%, and the content of B is 0.01-
0.03%, impurity content≤0.15%, remaining is Al.
Optionally, in other embodiments of the invention, the content of above-mentioned Zn is 10-12%, preferably 10.9-
12%.
Optionally, in other embodiments of the invention, the content of above-mentioned B is 0.01-0.02%, preferably
0.01-0.018%.
Optionally, in other embodiments of the invention, above-mentioned impurity element includes one of Cr, Cu, Ti and Na
Or it is a variety of.
Optionally, in other embodiments of the invention, the tension of the pack alloy of above-mentioned high-intensity and high-tenacity is strong
Degree is 320-400MPa；Preferably, the yield strength of the pack alloy of high-intensity and high-tenacity is 240-290MPa；It is preferred that
Ground, the elongation percentage of the pack alloy of high-intensity and high-tenacity are 4.5-8.0%；Preferably, the die casting aluminium of high-intensity and high-tenacity closes
The hardness of gold is 100-130HV.
The embodiment of the invention also provides a kind of preparation methods of the pack alloy of high-intensity and high-tenacity comprising: it will
The pack alloy raw material of the high-intensity and high-tenacity prepared heats fusing, then by melt casting ingot or casting and forming.
Optionally, in other embodiments of the invention, the system of the pack alloy melt of above-mentioned high-intensity and high-tenacity
Standby process includes: first to add to the raw material of Al, Si, Zn, Fe and Mn in smelting furnace, is warming up to 750-800 DEG C；Comparative alloy is set
Ingredient and actual measurement ingredient are counted, is adjusted in alloying component to scope of design, and be transferred to holding furnace, melt temperature is down to furnace
700-720 DEG C；It is subsequently added into the raw material of Mg, B and RE, stir-melting is at melt.
Optionally, in other embodiments of the invention, the raw material of the raw material of above-mentioned Si and Al, Zn, Fe and Mn are together
It is added, alternatively, adding the raw material of Si after the melting sources of Al, Zn, Fe and Mn.
Optionally, above-mentioned when the raw material of Mg, B and RE is added in other embodiments of the invention, by by Mg, B
It is added with the mode inside the raw material indentation melt of RE.
Optionally, above-mentioned before melt is cast ingot or casting and forming in other embodiments of the invention, also
Including carrying out degasification removal of impurities to melt；Preferably, by the way that refining agent is sprayed into melt to carry out degasification removal of impurities；Preferably, it uses
Refining agent is sprayed into melt as carrier by inert gas.
The beneficial effect of the embodiment of the present invention includes:
A kind of pack alloy of high-intensity and high-tenacity of the invention, the alloy have drawn Al-Si series and Al-Zn system
The advantages of column alloy, have that good casting property, feeding capacity is strong, thermal expansion coefficient is small and intensity is high, from the spies such as strengthening effect is good
Point is suitable for die-casting process production.Si content in alloy is located near Al-Si eutectic composition point, has ensured that alloy has most
Good casting character, while the hot cracking tendency of high Zn content aluminium alloy can be effectively reduced, improve the air-tightness of alloy.In alloy
Zn content is up to 8.0-12.0%, belongs to high Zn aluminium alloy, and the elements such as Zn and Al, Mg can form Al2Mg3Zn3And MgZn2Strengthen
Phase has ensured that alloy possesses very high intensity, while can no longer need to again easily obtained from quenching structure through high temperature solid solution heat
Processing obtains high-intensitive alloy, advantageously reduces process, energy saving.The presence of two kinds of elements of Fe and Mn advantageously reduces aluminium
Melt usually requires that the mass fraction of the two reaches 0.8%-1.1% to the corrode of metal die, but in order to eliminate harmfulness
Bigger primary Fe-rich phase and needle-shaped Fe-riched phase need the absolute content and relative amount of both strict control Mn and Fe.B element energy
Fe-riched phase is effectively reduced is initially formed temperature, to effectively inhibit the formation of primary Fe-rich phase in melt.RE element has
Very strong chemical activity and surface-active, melt can not only effectively be purified by being added in aluminum melt, while to structure refinement, Fe-riched phase
Modification also has certain facilitation, but RE too high levels easily form coarse rare-earth phase, influence the raising of the plasticity of alloy, because
This additive amount control of the present invention has no significant effect cost of alloy within 0.1%, and crystal grain refinement, helps to improve strong
Degree, while also improving toughness and reducing brittle transition temperature, improve alloy ductility.The alloy material of ingredient preparation is not only
Have many advantages, such as good casting character and from quenching property, also there is high-intensitive, high tenacity, room temperature tensile intensity 320-
400MPa, yield strength 240-290MPa, elongation percentage 4.5-8.0%, hardness 100-130HV are suitable for die-casting process.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the microscopic structure map (5000 times) for the alloy-steel casting that the embodiment of the present invention 1 provides.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
Pack alloy of high-intensity and high-tenacity of the embodiment of the present invention and preparation method thereof is specifically described below.
The embodiment of the invention provides a kind of pack alloys of high-intensity and high-tenacity, and chemical component is by weight percent
Meter includes: that the content of Si is 9.0-12.0%, and the content of Zn is 8.0-12.0%, and the content of Mg is 0.3-0.5%, Fe's
Content is 0.2-0.5%, and the content of Mn is 0.3-0.65%, and the content of RE is 0.05-0.1%, and the content of B is 0.01-
0.03%, impurity content≤0.15%, remaining is Al.
In the present embodiment, Si can be obtained as the main component for improving mobile performance from eutectic to hypereutectic in aluminium alloy
To good mobile phase, but the nascent Si phase formed easily forms hard spot, and machinability is made to be deteriorated, and in the application, the content of Si
For 9.0-12.0%, it is located near Al-Si eutectic composition point, the content of Si is higher in the application, and it is good to have ensured that alloy has
Good mobility and optimal casting character, while the hot cracking tendency of high Zn content aluminium alloy can be effectively reduced, improve alloy
Air-tightness.
It joined Zn and Mg in the application simultaneously in aluminium, form hardening constituent Al2Mg3Zn3And MgZn2, ensured that alloy is gathered around
There is very high intensity, while can subtract easily obtained from quenching structure without being heat-treated by high temperature solid solution to promote intensity again
Few process, it is energy saving.The content of Zn in the application is up to 8.0-12.0%, belongs to high Zn aluminium alloy, and the content of Mg is
0.3-0.5%, Zn and Mg in the application be different from the prior art completely middle Zn and Mg amount ranges (usual situation zinc and
The ratio of magnesium is controlled at 2.7 or so, stress corrosion, and cracking resistance is maximum), form a kind of high Zn aluminium alloy.
Fe can form acicular beta-Al with Al, Si5FeSi phase, since die casting is chilling, so the Fe-riched phase being precipitated is very thin,
Fe content easily occurs the phenomenon that mucous membrane lower than 0.8%, damages mould and die accuracy and service life.The presence of two kinds of elements of Fe and Mn, which has, to be conducive to
Aluminum melt is reduced to the corrode of metal die, so in the prior art, usually requiring that the mass fraction of the two reaches 0.8%-
1.1%, but in order to eliminate the bigger primary Fe-rich phase of harmfulness and needle-shaped Fe-riched phase, need the absolute of both strict controls Mn, Fe
Content and relative amount.And Mn, which is added, can greatly reduce the quantity and size of needle-shaped Fe-riched phase, or even make needle-shaped Fe-riched phase
It completely disappears.Therefore, the content of Fe is 0.2-0.5% in the application, and the content of Mn is 0.3-0.65%, being capable of effective guarantee
The quantity and size of needle-shaped Fe-riched phase are smaller, are conducive to promote die casting performance.
It is further noted that boron (B) element is also added into the chemical component of the application, through inventor the study found that B
The temperature that is initially formed of Fe-riched phase can be effectively reduced in element, and B has significantly Al-Si alloy grain degree, Fe-riched phase
Refining effect；After B element is added, can inhibit the formation of coarse nascent iron phase, promote Fe-riched phase by coarse starlike nascent iron phase,
Large scale dendroid, netted symbiosis Fe-riched phase become to the high dendroid of small size consistency, Chinese character shape and granular Fe-riched phase shape, into
And the formation of primary Fe-rich phase in melt is effectively inhibited, and then improve toughness.
The content of RE in the application is 0.05-0.1%, and RE element has very strong chemical activity and surface-active, adds
Melt can not only effectively be purified by entering in aluminum melt, while also have certain facilitation, but RE to structure refinement, Fe-riched phase modification
Too high levels easily form coarse rare-earth phase, and the plasticity for influencing alloy must improve, therefore the present invention selects reserves big, at low cost
Two kinds of lightweight rare earth elements of La, Ce, and additive amount control has no significant effect cost of alloy, and crystal grain is thin within 0.1%
Change, help to improve intensity, while also improving toughness and reducing brittle transition temperature, improves alloy ductility.The La in RE
With no restrictions with the mass ratio of Ce, it can be adjusted according to the actual situation.
In addition, impurity element includes one of Cr, Cu, Ti and Na or a variety of, the content of above-mentioned impurity element≤
0.15%.
By not only having in the application to the alloy material that the strict control of the content of each chemical component prepares
Good casting character and from quenching property, also has many advantages, such as high-intensitive, high tenacity, room temperature tensile intensity 320-400MPa,
Yield strength 240-290MPa, elongation percentage 4.5-8.0%, hardness 100-130HV are suitable for die-casting process.
In addition, it should be noted that, the minor change of any one alloying element contained can for alloy
Significantly change its second phase amount, object facies type, grain size and distribution, thus significantly change the performance of alloy, this
Also the content of other alloying elements in directly influencing, so as to cause even identical chemical component, chemical component
Content is different, it is also possible to have entirely different mechanical property.
A certain constituent content increases or decreases, and while the alliage effect for bringing its own, can also generate very much
Other attached adverse effects, need increasing or decreasing for other one or more constituent contents at this time, with overcome it is above-mentioned not
Benefit influences.On this basis, inventor by long-term research, constantly selects alloy compositions and is adjusted to provide
A kind of chemical component of the pack alloy with high-intensity and high-tenacity, chemical component includes: Si by mass percentage
Content be 9.0-12.0%, the content of Zn is 8.0-12.0%, and the content of Mg is 0.3-0.5%, and the content of Fe is
The content of 0.2-0.5%, Mn are 0.3-0.65%, and the content of RE is 0.05-0.1%, and the content of B is 0.01-0.03%,
Impurity content≤0.15%, remaining is Al.By the selection of the content of above-mentioned chemical component, so that preparing high intensity
The pack alloy of high tenacity have good casting property, feeding capacity is strong, thermal expansion coefficient is small and intensity is high, good from strengthening effect
The features such as, it is suitable for die-casting process production.The alloy material of ingredient preparation not only has good casting character and quenches certainly
Performance, also has many advantages, such as high-intensitive, high tenacity, room temperature tensile intensity 320-400MPa, and yield strength 240-290MPa prolongs
Rate 4.5-8.0% is stretched, hardness 100-130HV is suitable for die-casting process.
In addition, present invention also provides a kind of preparation methods of the pack alloy of above-mentioned high-intensity and high-tenacity comprising
The raw material of the pack alloy of the high-intensity and high-tenacity prepared is heated into fusing, then by melt casting ingot or casting and forming.
Specifically comprising following steps:
S1, the scaling loss and recovery rate for considering element calculate weight needed for each raw material component under set component；
S2, first the raw material of Al, Si, Zn, Fe and Mn in the raw material prepared added in smelting furnace, is warming up to 750-800
℃；
Wherein, Al material selection commercial-purity aluminium, Si material can choose Al-Si or simple substance Si, Zn material selection technical pure Zn, Fe
Material can choose Al-Fe or Fe agent, and Mn material can choose Al-Mn or Mn agent.
Si material therein can choose to be added together with the raw material of Al, Zn, Fe and Mn, at this point, the Si material being added is preferably
Al-Si intermediate alloy.Also it can choose after fusing is added in the raw material of Al, Zn, Fe and Mn, then row is added, the Si being added at this time
Material is preferably simple substance Si.When substep is added, melt temperature can be reduced, and advantageously reduce the scaling loss of Si material.
S3, the design ingredient of comparative alloy and actual measurement ingredient, adjust in alloying component to scope of design, and be transferred to heat preservation
Furnace, melt temperature are down to 700-720 DEG C with furnace；
S4, then with titanium tool by inside the raw material of proportioned Mg, B and RE indentation melt, stirring melt after fusing；
Wherein, Mg material is pure magnesium, and B material is Al-B, and RE material is Al-RE intermediate alloy.
In the application, by the way that the raw material of Mg, B and RE to be pressed into the inside of melt, the raw material of Mg, B and RE can be avoided
It is contacted with air, less melting loss of elements, improves element recovery rate.The mode of operation that substep is added simultaneously, so that Al, Si, Zn, Fe
Melting is carried out under the conditions of 750-800 DEG C with the raw material of Mn, when temperature is reduced to 700-720 DEG C, adds Mg, B and RE
Raw material, the scaling loss of the raw material of Mg, B and RE can be reduced at this time, thus save the cost.
S5, as carrier refining agent is sprayed into melt using high purity inert gas, degasification removal of impurities, subsequent sampling and testing is molten
Body chemical component, it is ensured that alloying component is qualified.It skims after standing 15 minutes, starting chain type ingot casting system casting ingot preparation is high-strength
Tough cast aluminium alloy material.
S6, the chemical component of beta alloy ingot, mechanical property, and tracking and testing its die casting mechanical property observe alloy
Metallographic structure.
With reference to embodiments to pack alloy of high-intensity and high-tenacity of the invention and preparation method thereof further into
Row illustrates.
Embodiment 1
It is designed to be divided into: 10%Si, 11%Zn, 0.35%Mg, 0.45%Fe, 0.4%Mn, 0.08%RE, 0.012%B.
When considering the scaling loss of Mg, RE, the quality of various raw material needed for 25t alloy is calculated.
(1) commercial-purity aluminium, Al-Si, Zn, Al-Fe, Al-Mn in the raw material prepared are added in smelting furnace, is warming up to 800
℃；
(2) after raw material is completely melt in furnace, gentle agitation melt is sampled in the middle part of melt with sample spoon, chemically examines alloy
Ingredient；The design ingredient and actual measurement ingredient of comparative alloy, adjust in alloying component to scope of design, and be transferred to holding furnace, melt
Temperature is down to 700 DEG C with furnace；
(3) proportioned simple substance Mg, Al-B and Al-RE intermediate alloy is pressed into inside melt with titanium tool, fusing
Stirring melt afterwards；
(4) refining agent is sprayed into melt as carrier using high purity inert gas, degasification removal of impurities, subsequent sampling and testing is molten
Body chemical component, it is ensured that alloying component is qualified.It skims after standing 15 minutes, starting chain type ingot casting system casting ingot preparation is high-strength
Tough cast aluminium alloy material.
(5) chemical component of beta alloy ingot, and tracking and testing its die casting mechanical property observe alloy microstructure,
As shown in Figure 1, microscopic structure map when its alloy-steel casting amplifies 5000 times, it will be seen from figure 1 that after die cast, alloy
Tissue is mainly made of tiny α-Al matrix phase and eutectic silicon, the former particle size range is 1-5 μm, and the latter's length is
0.2-1.5 μm.There are a small amount of granular Fe-riched phase and zinc-rich phase, sizes to be respectively less than 0.5 μm for eutectic area, significantly reduces pair
The harm of alloy plasticity.Remaining Zn is with Mg2Zn, AlMgZn Dispersed precipitate in the base, strengthen matrix.
Embodiment 2:
It is designed to be divided into: 12%Si, 9.5%Zn, 0.45%Mg, 0.30%Fe, 0.55%Mn, 0.1%RE, 0.02%B.
When considering the scaling loss of Mg, RE, the quality of various raw material needed for 25t alloy is calculated.
(1) commercial-purity aluminium, Al-Si, Zn, Fe agent, Mn agent in the raw material prepared are added in smelting furnace, is warming up to 780 DEG C；
(2) after raw material is completely melt in furnace, gentle agitation melt is sampled in the middle part of melt with sample spoon, chemically examines alloy
Ingredient；The design ingredient and actual measurement ingredient of comparative alloy, adjust in alloying component to scope of design, and be transferred to holding furnace, melt
Temperature is down to 710 DEG C with furnace；
(3) proportioned simple substance Mg, Al-B and Al-RE intermediate alloy is pressed into inside melt with titanium tool, fusing
Stirring melt afterwards；
(4) refining agent is sprayed into melt as carrier using high purity inert gas, degasification removal of impurities, subsequent sampling and testing is molten
Body chemical component, it is ensured that alloying component is qualified.It skims after standing 15 minutes, starting chain type ingot casting system casts ingot, and preparation is high
Strong high toughness casting aluminum alloy material.
(5) chemical component of beta alloy ingot, and tracking and testing its die casting mechanical property observe alloy microstructure.
Embodiment 3:
It is designed to be divided into: 9.0%Si, 8.0%Zn, 0.5%Mg, 0.5%Fe, 0.35%Mn, 0.05%RE, 0.03%B.
When considering the scaling loss of Mg, RE, the quality of various raw material needed for 25t alloy is calculated.
(1) it will be added in smelting furnace among commercial-purity aluminium in the raw material prepared, Zn, Fe agent, Al-Mn, be warming up to 760 DEG C；
(2) after raw material is completely melt in furnace, simple substance Si is added.After simple substance Si is completely melt, gentle agitation melt is used
Sample spoon samples in the middle part of melt, chemically examines alloying component；
(3) the design ingredient of comparative alloy and actual measurement ingredient, adjust in alloying component to scope of design, and be transferred to heat preservation
Furnace, melt temperature are down to 710 DEG C with furnace；
(4) proportioned simple substance Mg, Al-B and Al-RE intermediate alloy is pressed into inside melt with titanium tool, fusing
Stirring melt afterwards；
(5) refining agent is sprayed into melt as carrier using high purity inert gas, degasification removal of impurities, subsequent sampling and testing is molten
Body chemical component, it is ensured that alloying component is qualified.It skims after standing 15 minutes, pours into holding furnace direct-furnish die-cast formation equipment, prepare
High strength high toughness casting aluminum alloy die casting.
(6) chemical component, the mechanical property of casting are tested, and observes its metallographic structure.
Embodiment 4:
It is designed to be divided into: 10.5%Si, 12.0%Zn, 0.30%Mg, 0.4%Fe, 0.6%Mn, 0.1%RE, 0.02%
B.When considering the scaling loss of Mg, RE, the quality of various raw material needed for 25t alloy is calculated.
(1) commercial-purity aluminium, Zn, Al-Fe, Mn agent in the raw material prepared are added in smelting furnace, is warming up to 750 DEG C；
(2) after raw material is completely melt in furnace, simple substance Si is added.After simple substance Si is completely melt, gentle agitation melt is used
Sample spoon samples in the middle part of melt, chemically examines alloying component；
(3) the design ingredient of comparative alloy and actual measurement ingredient, adjust in alloying component to scope of design, and be transferred to heat preservation
Furnace, melt temperature are down to 720 DEG C with furnace；
(4) proportioned simple substance Mg, Al-B and Al-RE intermediate alloy is pressed into inside melt with titanium tool, fusing
Stirring melt afterwards；
(5) refining agent is sprayed into melt as carrier using high purity inert gas, degasification removal of impurities, subsequent sampling and testing is molten
Body chemical component, it is ensured that alloying component is qualified.It skims after standing 15 minutes, pours into holding furnace direct-furnish die-cast formation equipment, prepare
High strength high toughness casting aluminum alloy die casting.
(6) chemical component, the mechanical property of casting are tested, and observes its metallographic structure.
The chemical component comparison of embodiment 1-4 aluminium alloy is shown in Table 1.
The chemical component (wt.%) of aluminium alloy in 1. embodiment 1-4 of table
| Embodiment | Si | Zn | Mg | Fe | Mn | RE | B | Impurity element | Al |
| 1 | 9.89 | 10.95 | 0.36 | 0.46 | 0.43 | 0.08 | 0.010 | 0.14 | Surplus |
| 2 | 11.96 | 9.51 | 0.44 | 0.32 | 0.58 | 0.08 | 0.016 | 0.15 | Surplus |
| 3 | 9.06 | 7.98 | 0.49 | 0.50 | 0.38 | 0.05 | 0.026 | 0.13 | Surplus |
| 4 | 10.40 | 11.96 | 0.32 | 0.44 | 0.55 | 0.09 | 0.018 | 0.14 | Surplus |
In embodiment 1-4, other impurity elements may is that Cr, Cu, Ti, Na.
The mechanical property comparison of embodiment 1-4 aluminium alloy is shown in Table 2.
The mechanical property of aluminium alloy in 2. embodiment 1-4 of table
| Embodiment | Tensile strength/MPa | Surrender tensile strength/MPa | Elongation/% | Microhardness/HV |
| 1 | 370 | 275 | 4.98 | 120 |
| 2 | 345 | 250 | 6.53 | 116 |
| 3 | 330 | 240 | 7.05 | 112 |
| 4 | 395 | 280 | 4.53 | 126 |
In conclusion a kind of pack alloy of high-intensity and high-tenacity of the invention, which has drawn Al-Si series
The advantages of with Al-Zn series alloy, with good casting property, feeding capacity is strong, thermal expansion coefficient is small and intensity is high, strengthens certainly
The features such as effect is good is suitable for die-casting process production.Si content in alloy is located near Al-Si eutectic composition point, ensures
Alloy has optimal casting character, while the hot cracking tendency of high Zn content aluminium alloy can be effectively reduced, and improves the airtight of alloy
Property.Zn content in alloy is up to 8.0-12.0%, belongs to high Zn aluminium alloy, and the elements such as Zn and Al, Mg can form Al2Mg3Zn3
And MgZn2Hardening constituent has ensured that alloy possesses very high intensity, while again can be easily obtained from quenching structure, without passing through
High temperature solid solution heat treatment reduces process to promote intensity, energy saving.It is molten that the presence of two kinds of elements of Fe and Mn advantageously reduces aluminium
Body usually requires that the mass fraction of the two reaches 0.8%-1.1% to the corrode of metal die, but in order to eliminate harmfulness more
Big primary Fe-rich phase and needle-shaped Fe-riched phase need the absolute content and relative amount of both strict controls Mn, Fe.B element can have
Effect reduction Fe-riched phase is initially formed temperature, to effectively inhibit the formation of primary Fe-rich phase in melt.RE element has very
Strong chemical activity and surface-active, melt can not only effectively be purified by being added in aluminum melt, while be changed to structure refinement, Fe-riched phase
Property is also by certain facilitation, but RE too high levels easily form coarse rare-earth phase, and the plasticity for influencing alloy must improve, therefore
Two kinds of lightweight rare earth elements of La, Ce that the present invention selects reserves big, at low cost, and additive amount controls within 0.1%, to alloy
Cost has no significant effect, and crystal grain refinement, helps to improve intensity, while also improving toughness and reducing brittle transformation temperature
Degree improves alloy ductility.The alloy material of ingredient preparation not only has good casting character and from quenching property, also has
The advantages that high intensity, high tenacity, room temperature tensile intensity 320-400MPa, yield strength 240-290MPa, elongation percentage 4.5-
8.0%, hardness 100-130HV are suitable for die-casting process.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of pack alloy of high-intensity and high-tenacity, which is characterized in that its chemical component includes: Si by mass percentage
Content be 9.0-12.0%, the content of Zn is 8.0-12.0%, and the content of Mg is 0.3-0.5%, and the content of Fe is
The content of 0.2-0.5%, Mn are 0.3-0.65%, and the content of RE is 0.05-0.1%, and the content of B is 0.01-0.03%,
Impurity content≤0.15%, remaining is Al.
2. the pack alloy of high-intensity and high-tenacity according to claim 1, which is characterized in that the content of the Zn is
10-12%, preferably 10.9-12%.
3. the pack alloy of high-intensity and high-tenacity according to claim 1, which is characterized in that the content of the B is
0.01-0.02%, preferably 0.01-0.018%.
4. the pack alloy of high-intensity and high-tenacity according to claim 1, which is characterized in that the impurity element includes
One of Cr, Cu, Ti and Na or a variety of.
5. the pack alloy of high-intensity and high-tenacity according to claim 1, which is characterized in that the high-intensity and high-tenacity
Pack alloy tensile strength be 320-400MPa；
Preferably, the yield strength of the pack alloy of the high-intensity and high-tenacity is 240-290MPa；
Preferably, the elongation percentage of the pack alloy of the high-intensity and high-tenacity is 4.5-8.0%；
Preferably, the hardness of the pack alloy of the high-intensity and high-tenacity is 100-130HV.
6. a kind of preparation method of the pack alloy of high-intensity and high-tenacity as described in any one in claim 1-5, feature
It is comprising: the raw material of the pack alloy of the high-intensity and high-tenacity prepared is heated into fusing, then melt is cast
Ingot or casting and forming.
7. the preparation method of the pack alloy of high-intensity and high-tenacity according to claim 6, which is characterized in that will be described
The preparation process of the pack alloy melt of high-intensity and high-tenacity includes:
First the raw material of Al, Si, Zn, Fe and Mn are added in smelting furnace, are warming up to 750-800 DEG C；
The design ingredient and actual measurement ingredient of comparative alloy, adjust in alloying component to scope of design, and be transferred to holding furnace, melt
Temperature is down to 700-720 DEG C with furnace；
It is subsequently added into the raw material of Mg, B and RE, stir-melting is at melt.
8. the preparation method of the pack alloy of high-intensity and high-tenacity according to claim 7, which is characterized in that the original of Si
Expect to be added together with the raw material of Al, Zn, Fe and Mn, alternatively, adding the original of Si after the melting sources of Al, Zn, Fe and Mn
Material.
9. the preparation method of the pack alloy of high-intensity and high-tenacity according to claim 7, which is characterized in that be added
When the raw material of Mg, B and RE, it is added by the way that the raw material of Mg, B and RE to be pressed into the mode inside melt.
10. the preparation method of the pack alloy of high-intensity and high-tenacity according to claim 6, which is characterized in that inciting somebody to action
It further include that degasification removal of impurities is carried out to the melt before the melt casting ingot or casting and forming；
Preferably, by the way that refining agent is sprayed into the melt to carry out the degasification removal of impurities；
Preferably, the refining agent is sprayed into as carrier by the melt using inert gas.
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| CN113046606A (en) * | 2019-12-26 | 2021-06-29 | 比亚迪股份有限公司 | Aluminum alloy, preparation method thereof and aluminum alloy structural part |
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Address after: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee after: Institute of materials and processing, Guangdong Academy of Sciences Patentee after: ZHAOQING SOUTHERN ALUMINUM RECYCLING Co.,Ltd. Patentee after: SOUTH CHINA University OF TECHNOLOGY Address before: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee before: Guangdong Institute Of Materials And Processing Patentee before: ZHAOQING SOUTHERN ALUMINUM RECYCLING Co.,Ltd. Patentee before: SOUTH CHINA University OF TECHNOLOGY |
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Effective date of registration: 20230317 Address after: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee after: Institute of new materials, Guangdong Academy of Sciences Patentee after: ZHAOQING SOUTHERN ALUMINUM RECYCLING CO.,LTD. Patentee after: SOUTH CHINA University OF TECHNOLOGY Address before: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee before: Institute of materials and processing, Guangdong Academy of Sciences Patentee before: ZHAOQING SOUTHERN ALUMINUM RECYCLING CO.,LTD. Patentee before: SOUTH CHINA University OF TECHNOLOGY |