CN111850375B - Nano precipitation strengthening type high-strength high-plasticity multi-element alloy and preparation method thereof - Google Patents
Nano precipitation strengthening type high-strength high-plasticity multi-element alloy and preparation method thereof Download PDFInfo
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Abstract
A nanometer precipitation strengthening type high-strength high-plasticity multi-element alloy belongs to the technical field of metal materials, and comprises the following components in molar ratio of Al: cr: cu: fe: ni (17-26): (9-16): (6-12): (26-36): (20-32); the original crystal grains contain nano precipitated phases with face-centered cubic structures, the compressive strength is 1650-1850 MPa, the compressive yield strength is 1400-1550 MPa, and the plastic deformation rate is 11.0-12.5%. The preparation method comprises the following steps: 1): polishing the surfaces of pure metal simple substances Al, Cr, Cu, Fe and Ni to remove oxide skin, and weighing according to corresponding molar ratio for later use; 2) under the protection of argon, alloying vacuum arc melting is carried out on the weighed pure metal simple substance; 3) annealing treatment is carried out, and then the temperature is reduced to room temperature along with the furnace. The nano precipitation strengthening type high-strength high-plasticity multi-element alloy prepared by the invention can be directly applied to structural members bearing pressure load, and has the advantages of simple preparation process, convenient operation and contribution to popularization.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a nano precipitation-strengthened high-strength high-plasticity multi-element alloy and a preparation method thereof.
Background
The design concept of the multi-element alloy is derived from the high-entropy alloy, five or more elements are mixed in the alloy design, but the components of the alloy elements deviate from the equimolar proportion mode of the traditional high-entropy alloy. The alloy design mode enables the alloy to not only highlight the characteristic of certain high-content elements, but also retain the comprehensive properties of high strength, hardness, wear resistance, corrosion resistance and the like of the high-entropy alloy. The research results in recent years show that the main problem of the alloy consisting of a plurality of elements is how to improve the strength of the alloy in the environment of room temperature and keep the alloy to have better plasticity, namely the strengthening and toughening treatment of the multi-element alloy. Fine grain strengthening is a common strengthening and toughening method currently used for multi-element alloys, which increases the solidification speed during the smelting of the alloy or performs deformation treatment on the as-cast alloy, but the two methods have respective disadvantages: the solidification speed is too high, the internal stress of the alloy is too large, and the cast ingot is easy to crack; the alloy is required to have certain plasticity when being subjected to deformation treatment, and the alloy with poor plasticity cannot be realized. Therefore, the design development and application of the multi-element alloy need to solve the problem of strengthening and toughening treatment of the alloy.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multi-element alloy and a corresponding preparation method thereof, wherein a nano strengthening phase is precipitated in as-cast alloy grains, so that the strength and the plasticity of the alloy are greatly improved.
A nanometer precipitation strengthening type high-strength high-plasticity multi-element alloy comprises the following components in molar ratio of Al: cr: cu: fe: ni (17-26): (9-16): (6-12): (26-36): (20 to 32).
The multi-component alloy is of a single-phase structure with coarse grains in an as-cast state, the compressive strength is 850-950 MPa, and obvious yield and plasticity are avoided.
The multi-element alloy contains nano precipitated phases with face-centered cubic structures in original crystal grains, the compressive strength of the multi-element alloy is 1650-1850 MPa, the compressive yield strength of the multi-element alloy is 1400-1550 MPa, and the plastic deformation rate of the multi-element alloy is 11.0-12.5%.
The composition of the multi-component alloy is preferably, in terms of molar ratio, Al: cr: cu: fe: ni (19-25): (9-13): (8-10): (29-34): (25-31).
The multicomponent alloy preferably has a composition, in terms of molar ratio, of Al: cr: cu: fe: 20 parts of Ni: 10: 10: 30: 30, of a nitrogen-containing gas; the compressive yield strength of the multicomponent alloy in the proportion under the as-cast condition is 900MPa, and no obvious yield and plasticity exist; the compressive strength of the multi-component alloy in the proportion is 1700MPa, the compressive yield strength is 1450MPa, and the plastic deformation rate is 11.2%.
The preparation method of the nanometer precipitation strengthening type high-strength high-plasticity multi-element alloy comprises the following steps:
step 1: polishing the surfaces of pure metal simple substances Al, Cr, Cu, Fe and Ni to remove oxide skin, and weighing according to corresponding molar ratio for later use; the error between the actual mass and the theoretical calculated mass is within one percent;
step 2: under the protection of argon, alloying vacuum arc melting is carried out on the weighed pure metal simple substance; the smelting current is kept at 340-360A, electromagnetic stirring is added in the smelting process, and the ingot is repeatedly smelted for 6-8 times to ensure that the ingot is smelted uniformly;
and step 3: after the smelting is finished, annealing treatment is carried out, the annealing temperature is 1000-1300 ℃, and the heat preservation time is 4-8 h; then cooling to room temperature along with the furnace to obtain the multi-element alloy.
The preparation method of the multi-component alloy comprises the following steps:
in the steps 1 and 2, in order to ensure the purity of the metal simple substance raw materials and avoid the introduction of impurities, the five weighed pure metal simple substance raw materials are respectively put into an acetone solution for ultrasonic cleaning, and then are cleaned by alcohol and dried; the copper crucible in the smelting furnace also needs to be wiped by alcohol, so that the purity of the cast ingot is ensured as much as possible.
In the step 2, the cleaned pure metal simple substance raw materials are sequentially put into a water-cooled copper crucible from low to high according to the melting point temperature, the melting point is low, the metal is at the lower part, and the melting point is at the upper part. The purpose is to completely melt pure metal simple substances with high melting points and ensure that all metal elements can be fully mixed; it is possible to prevent the volatilization of the low melting point metal at an excessively high temperature, which causes the composition of the alloy ingot to deviate from the design composition.
In the steps 2 and 3, vacuumizing is carried out to ensure that the vacuum degree in the furnace is up to 10-4After the pressure is in the order of MPa, introducing argon as a protective gas until the pressure is 0.05MPa, starting arc striking smelting when the vacuum pumping is finished, and smelting the sponge titanium which is placed in another water-cooled copper crucible in advance to remove oxygen possibly remaining in a hearth and avoid oxidizing ingot casting by the remaining oxygen; and then, introducing the electric arc to the pure metal raw material to be smelted, increasing the power to keep the smelting current at 340-360A, adding electromagnetic stirring to ensure that the electric arc is completely above the pure metal simple substance raw material, repeatedly smelting for 6-8 times according to the method to ensure that the ingot is smelted uniformly, and obtaining the button ingot after smelting is finished. In order to avoid the oxidation of the cast ingot in the high-temperature annealing process, the cast ingot obtained by smelting is placed in a vacuum tube sealing mode; the temperature of a high-temperature box type resistance furnaceSetting the temperature to 1000-1300 ℃, opening the furnace door after the furnace temperature is reached, putting the vacuum tube sealed with the cast ingot into the resistance furnace, and closing the furnace door; and then, starting timing and heat preservation for 4-8 hours when the furnace temperature is stable at 1000-1300 ℃.
In the step 2, the obtained uniformly-smelted cast ingot is of a single-phase structure with coarse grains, the compressive strength is 850-950 MPa, and obvious yield and plasticity are avoided.
In the step 3, the multi-element alloy obtained after annealing precipitates a nano phase with a face-centered cubic structure in the original crystal grain, the compressive strength is improved to 1650-1850 MPa, the compressive yield strength is 1400-1550 MPa, and the plastic deformation rate is 11.0-12.5%.
Compared with the prior art, the invention has the beneficial effects that:
1. the multi-element alloy prepared by the invention adopts common Al, Cr, Cu, Fe and Ni elements, avoids the addition of noble Co element in the multi-element alloy and reduces the alloy cost; the content of the added Cu is low, so that the alloy can form a single-phase structure in an as-cast state, and the Cu segregation is avoided; the bulk alloy material can be obtained through vacuum arc melting, and the alloy preparation process is simpler; the nano strengthening phase can be separated out from the as-cast alloy through high-temperature annealing, the strength and the plasticity of the alloy are improved, and the treatment process is simple; the nano precipitation strengthening type high-strength high-plasticity multi-element alloy prepared by the invention can be directly applied to a structural member bearing the pressure load, or can be subjected to plastic processing to be manufactured into the structural member bearing the pressure load.
2. The multi-element alloy is a multi-element alloy material with high strength and high plasticity; after high-temperature annealing treatment, nano strengthening phase is precipitated in the original cast-state crystal grains, and the strength and the plasticity of the original cast-state alloy are greatly improved.
3. The invention only adopts a high-temperature annealing mode to treat the as-cast alloy, has simple process and convenient operation and is beneficial to popularization.
Drawings
FIG. 1 is an as-cast microstructure image of an Al20Cr10Cu10Fe30Ni30 multi-element alloy prepared in example 1 of the present invention;
FIG. 2 is an X-ray diffraction pattern of the as-cast Al20Cr10Cu10Fe30Ni30 multi-component alloy prepared in example 1 of the present invention;
FIG. 3 is a static room temperature compressive engineering stress-engineering strain curve of the Al20Cr10Cu10Fe30Ni30 multi-component alloy prepared in example 1 of the present invention in the as-cast state;
FIG. 4 is a low magnification microstructure image of Al20Cr10Cu10Fe30Ni30 multi-component alloy prepared in example 1 of the present invention;
FIG. 5 is a high magnification microstructure image of Al20Cr10Cu10Fe30Ni30 multi-component alloy prepared in example 1 of the present invention;
FIG. 6 is an X-ray diffraction pattern of an Al20Cr10Cu10Fe30Ni30 multi-component alloy prepared in example 1 of the present invention;
FIG. 7 is a static room temperature compressive engineering stress-engineering strain curve of the Al20Cr10Cu10Fe30Ni30 multi-component alloy prepared in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A nanometer precipitation strengthening type high-strength high-plasticity multi-element alloy comprises pure metal simple substances of Al, Cr, Cu, Fe and Ni with the purity of not less than 99.5 percent, wherein the molar ratio of the components is Al: cr: cu: fe: 20 parts of Ni: 10: 10: 30: 30.
the preparation method of the nanometer precipitation strengthening type high-strength high-plasticity multi-element alloy comprises the following steps:
step 1: and (3) polishing off the surface oxide skin of the pure metal elementary substance raw material by using No. 400 abrasive paper, wherein the surface oxide skin is polished off according to Al: cr: cu: fe: 20 parts of Ni: 10: 10: 30: weighing each metal simple substance according to the molar ratio of 30, wherein the error between the actual mass and the theoretical calculated mass is within one percent;
step 2: cleaning with acetone and ethanol, blow-drying, sequentially placing the pure metal simple substance raw materials into a water-cooled copper crucible from low melting point temperature to high melting point temperature, placing the pure metal simple substance raw materials with low melting point metal below and melting point metal belowHigh above; vacuumizing to make the vacuum degree in the furnace reach 10- 4Introducing argon as a protective gas after the MPa magnitude, until the pressure is 0.05MPa, and performing alloying vacuum arc melting after the vacuum pumping is finished; the smelting current is kept at 340-360A, electromagnetic stirring is added in the smelting process, smelting is carried out for 7 times, and uniform ingot casting smelting is guaranteed;
and step 3: after the smelting is finished, annealing treatment is carried out, the annealing temperature is 1000 ℃, and the heat preservation time is 4 hours; then cooling to room temperature along with the furnace to obtain the multi-element alloy.
As shown in FIG. 1, the as-cast microstructure of the multi-component alloy prepared in example 1 is a single-phase structure with relatively coarse grains formed in the as-cast condition of the Al20Cr10Cu10Fe30Ni30 multi-component alloy, and the grain boundary is clear;
the X-ray diffraction image of the as-cast multi-component alloy prepared in example 1 is shown in fig. 2, and it can be seen that the as-cast Al20Cr10Cu10Fe30Ni30 multi-component alloy has a single-phase body-centered cubic (BCC) structure, and the larger alloy grains make the diffraction peak wider;
the static room temperature compressive engineering stress-engineering strain curve of the as-cast multi-component alloy prepared in example 1 is shown in fig. 3, and it can be seen that the compressive strength of the Al20Cr10Cu10Fe30Ni30 multi-component alloy in the as-cast state is 900MPa, and there are almost no yield stage and plastic deformation stage;
the microstructure of the multi-element alloy prepared in example 1 under low magnification is shown in fig. 4, and it can be seen that the grain boundary characteristics of the original as-cast structure are still retained after the as-cast state of the Al20Cr10Cu10Fe30Ni30 multi-element alloy is subjected to high-temperature annealing, and an obvious precipitated phase appears in the interior of the grains;
the microstructure of the multi-element alloy prepared in example 1 under high magnification is shown in fig. 5, and it can be seen that a nano-scale lamellar structure is precipitated in grains after the Al20Cr10Cu10Fe30Ni30 multi-element alloy is subjected to high-temperature annealing in an as-cast state; the size of the precipitated phase is from 100nm to 5 mu m;
the X-ray diffraction image of the multi-component alloy prepared in example 1 is shown in fig. 6, and it can be seen that a new diffraction peak of a face-centered cubic (FCC) structure appears on the basis of the original as-cast alloy single-phase body-centered cubic (BCC) structure after the as-cast state of the Al20Cr10Cu10Fe30Ni30 multi-component alloy is subjected to high-temperature annealing; the precipitated nanophase after annealing is of an FCC structure;
the static room temperature compressive engineering stress-engineering strain curve of the multi-element alloy prepared in example 1 is shown in fig. 7, which shows that the compressive strength of the multi-element alloy in the as-cast state is increased to 1700MPa after high temperature annealing; the yield stage and the plastic deformation stage are obvious, the compressive yield strength is 1450MPa, and the plastic deformation rate is 11.2 percent; the alloy realizes strengthening and toughening.
Example 2
A nanometer precipitation strengthening type high-strength high-plasticity multicomponent alloy comprises pure metal simple substances of Al, Cr, Cu, Fe and Ni, wherein the purity of the pure metal simple substances is not less than 99.5%; the molar ratio of each component is, Al: cr: cu: fe: ni 17: 9: 6: 36: 32.
the specific implementation mode of the preparation method of the nanometer precipitation-strengthened high-strength high-plasticity multicomponent alloy is the same as that of example 1, and the differences are that: the molar ratio of each metal simple substance in the step 1 is Al: cr: cu: fe: ni 17: 9: 6: 36: 32, the other steps and conditions are the same as those of the embodiment 1, and correspondingly, the obtained multi-element alloy forms a single-phase structure with coarse grains in an as-cast state, the compressive strength is 850MPa, and the multi-element alloy has no yield and plasticity; after annealing treatment, a nano phase is precipitated in the original crystal grain in the cast state, the compressive strength of the multi-element alloy is improved to 1650MPa from the cast state, the compressive yield strength is 1400MPa, and the plastic deformation rate is 11.0%.
Example 3
A nanometer precipitation strengthening type high-strength high-plasticity multicomponent alloy comprises pure metal simple substances of Al, Cr, Cu, Fe and Ni, wherein the purity of the pure metal simple substances is not less than 99.5%; the molar ratio of each component is, Al: cr: cu: fe: 23 parts of Ni: 13: 10: 29: 25.
the specific implementation mode of the preparation method of the nanometer precipitation-strengthened high-strength high-plasticity multicomponent alloy is the same as that of example 1, and the differences are that: the molar ratio of each metal simple substance in the step 1 is Al: cr: cu: fe: 23 parts of Ni: 13: 10: 29: 25, the other steps and conditions are the same as those of the example 1, and accordingly the obtained multi-element alloy forms a single-phase structure with coarse grains in an as-cast state, the compressive strength is 950MPa, and yield and plasticity are avoided; after annealing treatment, a nano phase is precipitated in the original crystal grain in the as-cast state, the compressive strength of the multi-element alloy is improved to 1800MPa from the as-cast state, the compressive yield strength is 1500MPa, and the plastic deformation rate is 12.0 percent.
Example 4
A nanometer precipitation strengthening type high-strength high-plasticity multicomponent alloy comprises pure metal simple substances of Al, Cr, Cu, Fe and Ni, wherein the purity of the pure metal simple substances is not less than 99.5%; the molar ratio of each component is, Al: cr: cu: fe: 26 parts of Ni: 16: 12: 26: 20.
the specific implementation mode of the preparation method of the nanometer precipitation-strengthened high-strength high-plasticity multicomponent alloy is the same as that of example 1, and the differences are that: the molar ratio of each metal simple substance in the step 1 is Al: cr: cu: fe: 26 parts of Ni: 16: 12: 26: 20, the other steps and conditions are the same as those of the embodiment 1, and correspondingly, the obtained multi-element alloy forms a single-phase structure with coarse grains in an as-cast state, the compressive strength is 910MPa, and the multi-element alloy has no yield and plasticity; the nano phase is separated out from the original crystal grain after the as-cast state is annealed, the compressive strength of the multi-element alloy is improved to 1790MPa from the as-cast state, the compressive yield strength is 1480MPa, and the plastic deformation rate is 11.7 percent.
Example 5
The molar ratio of each component of the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is the same as that in the embodiment 1.
The specific implementation mode of the preparation method of the nanometer precipitation-strengthened high-strength high-plasticity multicomponent alloy is the same as that of example 1, and the differences are that: the annealing temperature in the step 3 is set to 1200 ℃, the heat preservation time is 8 hours, other steps and conditions are the same as those of the embodiment 1, and accordingly the obtained multi-element alloy forms a single-phase structure with coarse grains in an as-cast state, the compressive strength is 900MPa, and the multi-element alloy has no yield and plasticity; the nano phase is separated out in the original crystal grain after the as-cast state is annealed, the compressive strength of the multi-element alloy is improved to 1780MPa from the as-cast state, the compressive yield strength is 1510MPa, and the deformation rate is 12.1 percent.
Example 6
The molar ratio of each component of the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is the same as that in the embodiment 2.
The specific implementation mode of the preparation method of the nano precipitation-strengthened high-strength high-plasticity multi-element alloy is the same as that of the embodiment 2, and the differences are that: the annealing temperature in the step 3 is set to 1200 ℃, the heat preservation time is 8 hours, other steps and conditions are the same as those of the embodiment 2, and accordingly the obtained multi-element alloy forms a single-phase structure with coarse grains in an as-cast state, the compressive strength is 850MPa, and the multi-element alloy has no yield and plasticity; after annealing treatment, a nano phase is precipitated in the original crystal grain in the cast state, the compressive strength of the multi-element alloy is improved to 1720MPa from the cast state, the compressive yield strength is 1530MPa, and the plastic deformation rate is 11.7%.
Example 7
The molar ratio of each component of the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is the same as that in the embodiment 3.
The specific implementation mode of the preparation method of the nano precipitation-strengthened high-strength high-plasticity multi-element alloy is the same as that in example 3, and the differences are that: the annealing temperature in the step 3 is set to 1200 ℃, the heat preservation time is 8 hours, other steps and conditions are the same as those of the embodiment 3, and accordingly the multi-element alloy which forms a single-phase structure with coarse grains in an as-cast state is obtained, the compressive strength is 950MPa, and the multi-element alloy has no yield and plasticity; after the as-cast state is annealed, a nano phase is separated out from the original crystal grains, the compressive strength of the multi-element alloy is improved from the as-cast state to 1850MPa, the compressive yield strength is 1550MPa, and the plastic deformation rate is 12.5%.
Example 8
The molar ratio of each component of the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is the same as that in the embodiment 4.
The specific implementation mode of the preparation method of the nano precipitation-strengthened high-strength high-plasticity multi-element alloy is the same as that of example 4, and the differences are that: the annealing temperature in the step 3 is set to 1200 ℃, the heat preservation time is 8 hours, other steps and conditions are the same as those of the embodiment 4, and accordingly the multi-element alloy which forms a single-phase structure with coarse grains in an as-cast state is obtained, the compressive strength is 940MPa, and the multi-element alloy has no yield and plasticity; after annealing treatment, a nano phase is precipitated in the original crystal grain in the cast state, the compressive strength of the multi-element alloy is improved to 1810MPa from the cast state, the compressive yield strength is 1520MPa, and the plastic deformation rate is 12.3%.
Example 9
The molar ratio of each component of the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is the same as that in the embodiment 1.
The specific implementation mode of the preparation method of the nanometer precipitation-strengthened high-strength high-plasticity multicomponent alloy is the same as that of example 1, and the differences are that: the annealing temperature in the step 3 is set to 1300 ℃, the heat preservation time is 6h, other steps and conditions are the same as those of the embodiment 1, and accordingly the multi-element alloy which forms a single-phase structure with coarse grains in an as-cast state is obtained, the compressive strength is 880MPa, and the multi-element alloy has no yield and plasticity; the nano phase is separated out in the original crystal grain after the as-cast state is annealed, the compressive strength of the multicomponent alloy is improved from the as-cast state to 1715MPa, the compressive yield strength is 1493MPa, and the deformation rate is 11.8%.
Example 10
The molar ratio of each component of the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is the same as that in the embodiment 4.
The specific implementation mode of the preparation method of the nano precipitation-strengthened high-strength high-plasticity multi-element alloy is the same as that of example 4, and the differences are that: the annealing temperature in the step 3 is set to 1300 ℃, the heat preservation time is 6h, other steps and conditions are the same as those of the embodiment 4, and accordingly the multi-element alloy which forms a single-phase structure with coarse grains in an as-cast state is obtained, the compressive strength is 916MPa, and the multi-element alloy has no yield and plasticity; the nano phase is separated out in the original crystal grain after the as-cast state is annealed, the compressive strength of the multi-element alloy is improved to 1790MPa from the as-cast state, the compressive yield strength is 1460MPa, and the plastic deformation rate is 11.4 percent.
The technical idea of the present invention is described in the above technical solutions, and the protection scope of the present invention is not limited thereto, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention belong to the protection scope of the technical solutions of the present invention.
Claims (6)
1. A nano precipitation strengthening type high-strength high-plasticity multi-element alloy is characterized in that the composition of the multi-element alloy comprises the following components in mol ratio of Al: cr: cu: fe: ni = (17-26): (9-16): (6-12): (26-36): (20-32); the alloy is a single-phase structure with coarse grains in an as-cast state, the compressive strength is 850-950 MPa, and obvious yield and plasticity are avoided; the multi-element alloy contains nano precipitated phases with face-centered cubic structures in original crystal grains, the compressive strength is 1650-1850 MPa, the compressive yield strength is 1400-1550 MPa, and the plastic deformation rate is 11.0-12.5%.
2. The multi-element alloy of claim 1, wherein the composition of the multi-element alloy is, in terms of mole ratio, Al: cr: cu: fe: ni = (19-25): (9-13): (8-10): (29-34): (25-31).
3. The multi-element alloy of claim 2, wherein the composition of the multi-element alloy is, in terms of mole ratio, Al: cr: cu: fe: ni = 20: 10: 10: 30: 30.
4. the multi-element alloy of claim 3, wherein said multi-element alloy has a compressive yield strength of 900MPa in the as-cast state, no significant yield and plasticity; the compressive strength of the multi-component alloy is 1700MPa, the compressive yield strength is 1450MPa, and the plastic deformation rate is 11.2%.
5. The method for preparing the nano precipitation-strengthened high-strength high-plasticity multi-element alloy as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
step 1: polishing the surfaces of pure metal simple substances Al, Cr, Cu, Fe and Ni to remove oxide skin, and weighing according to corresponding molar ratio for later use;
step 2: under the protection of argon, alloying vacuum arc melting is carried out on the weighed pure metal simple substance; wherein the smelting current is kept at 340-360A, electromagnetic stirring is added in the smelting process, and the smelting is repeated for 6-8 times;
and step 3: after the smelting is finished, annealing treatment is carried out, the annealing temperature is 1000-1300 ℃, and the heat preservation time is 4-8 h; then the temperature is reduced to the room temperature along with the furnace, and the nano precipitation strengthening type high-strength high-plasticity multi-element alloy is obtained.
6. The preparation method according to claim 5, wherein in the step 2, when the pure metal simple substance is subjected to alloying vacuum arc melting, raw materials of the pure metal simple substance are sequentially put into a water-cooled copper crucible from low to high according to the melting point temperature, wherein the melting point is lower than that of the metal, and the melting point is higher than that of the metal.
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| KR102070059B1 (en) * | 2018-06-20 | 2020-03-02 | 충남대학교산학협력단 | High entropy alloys with intermetallic compound precipitates for strengthening and method for manufacturing the same |
| KR102273787B1 (en) * | 2018-10-22 | 2021-07-06 | 원진금속(주) | Complex copper alloy comprising high entropy alloy and method for manufacturing the same |
| CN109161780B (en) * | 2018-11-07 | 2021-04-16 | 安阳工学院 | Method for improving processing performance of FeCrNiAl-based high-entropy alloy |
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