# US 11,898,229 B2 · High-strength and high-plasticity casting high-entropy alloy (HEA) and preparation method thereof

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- Number: US 11,898,229 B2
- Document ID: US11898229B2
- Status: Granted
- Kind: B2
- Application number: 17/862,197
- Filed: 2022-07-11
- Published: 2023-01-19
- Granted: 2024-02-13
- Earliest claimed: 2021-07-19
- Assignees: Shanghai Institute of Technology
- Applicants: Shanghai Institute of Technology
- Inventors: Zemin Wang; Jiajun Li; Yu Dong; Min Liu; Linghuan Pang; Bin Fu; Zhanyong Wang
- Web page: https://patentgrep.com/patent/US11898229B2

## CPC

- C22C 30/02: containing copper
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 1/023: {Alloys based on nickel}
- C22C 19/05: with chromium
- C22C 19/058: {without Mo and W}
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

The present disclosure provides a high-strength and high-plasticity casting high-entropy alloy (HEA), having a general formula of AlaCobCrcTidFeeNifCug, where 6.0<a≤8.0, 18.0<b≤23.0, 7.5≤c<12.5, 2.0<d≤8.5, 15.5<e≤20.0, 28.0<f≤37.0, 0.2<g≤10.0, and a+b+c+d+e+f+g=100. The casting HEA can be prepared in one step and has excellent mechanical properties. The various metal raw materials are environmental-friendly and suitable for large-scale industrial production.

## Claims

### Claim 1

A casting alloy, having a general formula of AlaCobCrcTidFeeNifCug, wherein 6.0<a<8.0, 18.0<b≤23.0, 7.5≤c<12.5, 2.0<d≤8.5, 15.5<e≤21.9, 28.0<f≤37.0, 0.2<g≤0.6, and a+b+c+d+e+f+g=100.

### Claim 2 (depends on 1)

The casting alloy according to claim 1, wherein in the general formula of the casting alloy, 6.9<a≤7.5, 20.2<b≤21.9, 10.1≤c<11.0, 4.6<d≤5.0, 20.2<e≤21.9, 30.3<f≤32.9, and 0.5<g≤0.6.

### Claim 3 (depends on 1)

The casting alloy HEA according to claim 1, wherein the casting alloy HEA has a tensile strength of 900 MPa to 1,200 MPa and an elongation of 15% to 24%.

### Claim 4 (depends on 1)

A preparation method of the casting alloy according to claim 1, comprising the following steps:
step 1): completely cleaning bulk particles of Al, Co, Cr, Cu, Fe, Ni, and Ti elementary substances, and weighing according to a proportion;
step 2): vacuumizing a vacuum smelting furnace to not more than 6.0×10-4 Pa, and introducing a protective gas; adding Ti into the vacuum smelting furnace for deoxidation, adding the rest of the elementary substances for melting, and stirring for smelting; and
step 3): after the smelting is completed, pouring an alloy obtained in step 2) into a water cooling plate-shaped copper mold for casting, cooling to room temperature, and collecting a finished product.

### Claim 5 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in the general formula of the casting alloy, 6.9<a≤7.5, 20.2<b≤21.9, 10.1≤c<11.0, 4.6<d≤5.0, 20.2<e≤21.9, 30.3<f≤32.9, and 0.5<g≤0.6.

### Claim 6 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein the casting alloy has a tensile strength of 900 MPa to 1,200 MPa and an elongation of 15% to 24%.

### Claim 7 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in step 1), the elementary substances each have a purity of not less than 99.95%.

### Claim 8 (depends on 5)

The preparation method of the casting alloy according to claim 5, wherein in step 1), the elementary substances each have a purity of not less than 99.95%.

### Claim 9 (depends on 6)

The preparation method of the casting alloy according to claim 6, wherein in step 1), the elementary substances each have a purity of not less than 99.95%.

### Claim 10 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in step 2), the vacuum smelting furnace is a vacuum arc smelting furnace or a vacuum induction smelting furnace.

### Claim 11 (depends on 5)

The preparation method of the casting alloy according to claim 5, wherein in step 2), the vacuum smelting furnace is a vacuum arc smelting furnace or a vacuum induction smelting furnace.

### Claim 12 (depends on 6)

The preparation method of the casting alloy according to claim 6, wherein in step 2), the vacuum smelting furnace is a vacuum arc smelting furnace or a vacuum induction smelting furnace.

### Claim 13 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in step 2), the protective gas is argon or other gas that does not react with metal raw materials, having a purity of 99.999%.

### Claim 14 (depends on 5)

The preparation method of the casting alloy according to claim 5, wherein in step 2), the protective gas is argon or other gas that does not react with metal raw materials, having a purity of 99.999%.

### Claim 15 (depends on 6)

The preparation method of the casting alloy according to claim 6, wherein in step 2), the protective gas is argon or other gas that does not react with metal raw materials, having a purity of 99.999%.

### Claim 16 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in step 2), the smelting is conducted by overturning type smelting 5 times with 5 min in each time.

### Claim 17 (depends on 5)

The preparation method of the casting alloy according to claim 5, wherein in step 2), the smelting is conducted by overturning type smelting 5 times with 5 min in each time.

### Claim 18 (depends on 6)

The preparation method of the casting alloy according to claim 6, wherein in step 2), the smelting is conducted by overturning type smelting 5 times with 5 min in each time.

### Claim 19 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in step 3), the alloy has a thickness of not less than 8 mm.

### Claim 20 (depends on 4)

The preparation method of the casting alloy according to claim 4, wherein in step 3), the alloy has a uniformly-distributed dendritic structure.