CN109897997B - Lithium-containing aluminum magnesium silicon two-phase enhanced eutectic light medium-entropy alloy and preparation method thereof - Google Patents
Lithium-containing aluminum magnesium silicon two-phase enhanced eutectic light medium-entropy alloy and preparation method thereof Download PDFInfo
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- CN109897997B CN109897997B CN201910267401.6A CN201910267401A CN109897997B CN 109897997 B CN109897997 B CN 109897997B CN 201910267401 A CN201910267401 A CN 201910267401A CN 109897997 B CN109897997 B CN 109897997B
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 82
- 239000000956 alloy Substances 0.000 title claims abstract description 82
- 230000005496 eutectics Effects 0.000 title claims abstract description 21
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 12
- -1 aluminum magnesium silicon Chemical compound 0.000 title claims abstract description 6
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000011777 magnesium Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 12
- 238000005275 alloying Methods 0.000 claims description 9
- 229910018464 Al—Mg—Si Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000012856 weighed raw material Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010931 gold Substances 0.000 abstract description 2
- 229910052737 gold Inorganic materials 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000008018 melting Effects 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 239000006023 eutectic alloy Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
The invention relates to a lithium-containing aluminum magnesium silicon two-phase enhanced eutectic light medium-entropy alloy and a preparation method thereof, belonging to the field of metal material preparation. Designed light eutectic medium entropy alloyThe component molecular expression of gold is Al80Mg10Cu2Zn2Si5Li1. The designed alloy is a dual-phase reinforced eutectic structure alloy, has good fluidity and has application prospects of conventional casting and pressure casting. The alloy is smelted by a vacuum induction method, and is cast into a steel mould by gravity to obtain an alloy ingot, and the alloy ingot is simple in preparation process and low in cost.
Description
Technical Field
The invention belongs to the field of metal material preparation, and particularly relates to a lithium-containing high-strength aluminum-magnesium-silicon two-phase reinforced eutectic light medium-entropy alloy and a preparation method thereof
Background
For traditional alloys, the high-entropy alloy is a brand-new alloy design concept and thought, and based on the fact that the applicant has applied an invention patent and has obtained an authorization, the patent numbers: 201710946804.4, the alloy system has good mechanical property. However, there are some problems that although the designed target alloy has reached a certain strength, the influence of the addition of the alloying element on the alloy system has not been studied in depth, and particularly, the influence of the addition of the Si element on the alloy performance has not been studied. Si is used as a common added alloying element, has the characteristics of low density, high strength and low price, and can correspondingly improve the fluidity of the alloy, and correspondingly, because the melting point of the simple substance Si is higher, the application temperature condition of the alloy can be correspondingly improved, but the excessive addition of Si can also have bad influence on the plasticity of the alloy. In addition, the applicant's last patent did not focus on the castability of the alloy.
Disclosure of Invention
The invention provides a high-strength high-toughness light medium-entropy eutectic alloy component, which has the room-temperature fracture strength of more than 850MPa, the compression plasticity of more than 20 percent and the alloy density of less than 2.7g/cm3The structure of the casting powder is characterized by having two reinforcing phases, showing a eutectic structure, having good fluidity and excellent casting performance, and having good casting and pressure casting application prospects.
A lithium-containing Al-Mg-Si biphase reinforced eutectic light medium-entropy alloy is characterized by comprisingThe molecular formula of gold is Al80Mg10Cu2Zn2Si5Li1Wherein each alloying element is in a molar ratio.
The preparation method of the lithium-containing aluminum magnesium silicon two-phase reinforced eutectic light medium entropy alloy is characterized by comprising the following steps of:
(1) removing a surface oxide layer of the prepared alloy raw material by using a grinding wheel machine, and weighing each component raw material by using an electronic balance;
(2) putting the weighed raw materials into a graphite crucible, putting the graphite crucible into an induction coil, vacuumizing to 20Pa, and introducing protective gas to 0.3 MPa;
(3) heating by using a high-frequency induction device, and preserving heat after the alloy is melted;
(4) and turning off the power supply, and casting the alloy into a steel die to obtain an alloy ingot.
Further, the alloy raw material in the step (1) is industrial pure aluminum (99.70%), the Li is added by adopting Mg-20Li intermediate alloy, the purity of other raw materials is 99.9%, and the alloy proportioning error is controlled to be +/-0.3%.
Furthermore, the raw materials in the step (2) are added in the order of the intermediate alloy, so that the volatilization of the molten intermediate alloy is less, and the stability of the alloy components is ensured.
Further, the temperature of the heat preservation in the step (3) is controlled within 850 ℃ and the time is controlled within 20-30min, so as to ensure that the alloying elements are fully diffused.
Further, the alloy ingot is obtained by adopting the conventional induction melting and gravity casting method for melting the alloy.
Based on the optimal components of the 201710946804.4 patent, the applicant properly adds a trace amount of alloying element Li to improve the morphology of a precipitated phase in the alloy aiming at the influence of the addition of the alloying element Si on the alloy structure and performance, and basically considers that the addition of the trace amount of Si has a bad influence on the mechanics of the alloy for the traditional aluminum alloy. However, the addition of a large amount of Si element can often improve the high-temperature application condition of the alloy, but the traditional Al-Si alloy often only has single-phase Si precipitation phase reinforcement, which is based on an Al-Si phase diagram, the designed eutectic Si and hypereutectic alloy with Si addition amounts of 10-30% of the alloy are designed, and the relation of Si element to the composition and structure properties of the alloy under various precipitation phase conditions and high alloying element conditions is not studied. Li is used as the lightest metal element, has low atomic number, can obtain a large amount of atomic molar ratio by adding trace amount, and can effectively control the alloy cost; in addition, researches find that the addition of a trace amount of Li can refine the morphology of a precipitated phase, promote the formation of a eutectic structure in a system and inhibit the growth of a primary phase. Based on the applicant, the high-alloying medium-entropy alloy of the system is designed, and the casting performance of the alloy is focused by improving the structural performance characteristics of the alloy. Because the eutectic alloy has a low melting point, the eutectic alloy has higher fluidity under the same casting temperature compared with the traditional alloy. Finally, corresponding optimized alloy components are obtained through relevant experiments, alloy components with eutectic structures are obtained, and finally, the medium-entropy alloy components with the eutectic structures are designed. A novel low-cost light high-strength eutectic medium-entropy alloy is prepared by adopting a vacuum induction melting method and combining a gravity casting method. The preparation method designed by the invention is a conventional preparation method, namely an induction melting method, and the preparation process is simple.
Drawings
FIG. 1 shows an alloy Al designed according to the present invention80Mg10Zn2Cu2Si5Li1Scanning Electron Microscope (SEM) picture of the light weight, high strength and high entropy alloy.
FIG. 2 shows Al of example of the present invention80Mg10Zn2Cu2Si5Li1Compressive stress-strain curve of light weight, high strength and high entropy alloy.
Detailed Description
Examples
The molecular formula of the light high-strength Li-containing eutectic high-entropy alloy prepared by the embodiment is Al80Mg10Zn2Cu2Si5Li1The preparation method comprises the following specific steps: shearing industrial grade pure aluminum and Mg-20Li intermediate alloy into small pieces, grinding by using a grinding wheel machine to remove oxide skin, putting high-purity (99.9) particle raw materials Mg, Zn, Cu and Si on an electronic balance according to the pre-calculated mass, weighing within the range of +/-0.3 percent, wherein the total mass of the raw materials is 150 g. Then the prepared raw materials are sequentially put into a graphite crucible, vacuumized, pumped to 20Pa by a mechanical pump, and then filled with high-purity argon for protection to 0.3 MPa. And then carrying out induction heating, and after the alloy is melted, keeping the temperature for 20-30min to ensure that the added alloy elements are uniformly diffused, wherein the melting temperature is controlled at 850 ℃ of 700-. And finally, closing the induction heating power supply, and casting the alloy melt into a steel die with the diameter of 30mm to obtain the alloy cast ingot.
Claims (6)
1. The lithium-containing aluminum magnesium silicon two-phase reinforced eutectic light medium entropy alloy is characterized in that the molecular formula of the alloy is Al80Mg10Cu2Zn2Si5Li1Wherein each alloying element is in a molar ratio.
2. The method for preparing the lithium-containing Al-Mg-Si two-phase reinforced eutectic light entropy alloy as claimed in claim 1, which is characterized by comprising the following steps:
(1) removing a surface oxide layer of the prepared alloy raw material by using a grinding wheel machine, and weighing each component raw material by using an electronic balance;
(2) putting the weighed raw materials into a graphite crucible, putting the graphite crucible into an induction coil, vacuumizing to 20Pa, and introducing protective gas to 0.3 MPa;
(3) heating by using a high-frequency induction device, and preserving heat after the alloy is melted;
(4) and turning off the power supply, and casting the alloy into a steel die to obtain an alloy ingot.
3. The method for preparing the lithium-containing Al-Mg-Si two-phase reinforced eutectic light entropy alloy as claimed in claim 2, wherein the raw material of the alloy in the step (1) is industrial pure aluminum with a purity of 99.70%, the Li is added by Mg-20Li intermediate alloy, the purity of other raw materials is 99.9%, and the alloy proportioning error is controlled within +/-0.3%.
4. The method for preparing the lithium-containing Al-Mg-Si two-phase reinforced eutectic light entropy alloy as claimed in claim 2, wherein the alloy is added in the step (2) in the sequence of the intermediate alloy, so as to ensure that the intermediate alloy is less volatilized after being melted and ensure the stability of the alloy components.
5. The method for preparing the lithium-containing Al-Mg-Si two-phase reinforced eutectic light entropy alloy as claimed in claim 2, wherein the heat preservation time in the step (3) is controlled within 20-30min to ensure that the alloy elements are fully diffused, and the alloy smelting temperature is controlled at 700-850 ℃.
6. The method for preparing the lithium-containing Al-Mg-Si two-phase reinforced eutectic light entropy alloy as claimed in claim 2, wherein the alloy is smelted by adopting conventional induction smelting and gravity casting to obtain an alloy ingot.
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| CN112643003A (en) * | 2020-12-01 | 2021-04-13 | 中南大学 | Method for preparing aluminum-based medium-entropy alloy through electromagnetic stirring casting |
| CN114622121B (en) * | 2022-03-25 | 2022-11-08 | 赣南师范大学 | Medium-entropy alloy and preparation method thereof |
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| US5599467A (en) * | 1993-11-19 | 1997-02-04 | Honda Giken Kogyo Kabushiki Kaisha | Aluminum weldment and method of welding aluminum workpieces |
| KR20150011717A (en) * | 2013-07-23 | 2015-02-02 | 주식회사 한라캐스트 | Aluminum alloy for die casting and its die casting product thereof |
| CN103572117A (en) * | 2013-10-21 | 2014-02-12 | 姚富云 | High-strength aluminum alloy with high corrosion resistance and weldability |
| CN103981405B (en) * | 2014-05-09 | 2015-05-13 | 曹帅 | Low-density high-damping aluminum based damping alloy and preparation method thereof |
| CN104630576B (en) * | 2014-12-29 | 2017-01-11 | 江苏中色锐毕利实业有限公司 | Hypoeutectic aluminum-silicon alloy with excellent thermal conductivity, preparation method and application thereof |
| CN104711463B (en) * | 2015-03-17 | 2017-01-04 | 中南大学 | A kind of Al-Mg-Zn-Li alloy and sheet material preparation method thereof |
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| CN105525156A (en) * | 2016-02-01 | 2016-04-27 | 安徽乾通教育制造有限公司 | Novel aluminum-silicon-copper-magnesium alloy material and preparation method thereof |
| US20170314097A1 (en) * | 2016-05-02 | 2017-11-02 | Korea Advanced Institute Of Science And Technology | High-strength and ultra heat-resistant high entropy alloy (hea) matrix composites and method of preparing the same |
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