# US 2014/0150932 A1 · Multi-element alloy material and method of manufacturing the same

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- Number: US 2014/0150932 A1
- Document ID: US20140150932A1
- Status: Published application
- Kind: A1
- Application number: 13/727,131
- Filed: 2012-12-26
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Industrial Technology Research Institute
- Applicants: Industrial Technology Research Institute
- Inventors: Yu-Hsien Chou; Chih-Chao Yang
- Web page: https://patentgrep.com/patent/US20140150932A1

## CPC

- C22C 30/00: Alloys containing less than 50% by weight of each constituent
- C22C 27/04: Alloys based on tungsten or molybdenum
- C22C 27/06: Alloys based on chromium
- C22F 1/16: of other metals or alloys based thereon
- C22F 1/18: High-melting or refractory metals or alloys based thereon
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

A multi-element alloy material consists of Al, Cr, Fe, Mn, Mo and Ni. From an outer surface to a center of the multi-element alloy material exhibits a hardness gradient from high to low. A method of manufacturing a multi-element alloy material with hardness gradient includes melting and casting metals with a metal combination of Al, Cr, Fe, Mn, Mo and Ni to form an alloy body, subjecting the alloy body to a homogenization treatment, and subjecting the homogenized alloy body to a high temperature treatment to perform precipitation hardening at surface of the alloy body by heating, thereby forming a multi-element alloy material having hardness gradient.

## Claims

### Claim 1

A multi-element alloy material, consisting of Al, Cr, Fe, Mn, Mo and Ni, and exhibiting a hardness gradient from high to low correspondingly from an outer surface inward of the multi-element alloy material.

### Claim 2 (depends on 1)

The multi-element alloy material according to claim 1, wherein the outer surface exhibits a surface hardness with at least 400Hv, and at least a portion having a thickness of 1 mm horizontally inward from the outer surface exhibits the surface hardness.

### Claim 3 (depends on 2)

The multi-element alloy material according to claim 2, wherein a center of the multi-element alloy material has a core hardness of about 300Hv to 500Hv, while the surface hardness is in a range of about 700Hv to 1200Hv.

### Claim 4 (depends on 1)

The multi-element alloy material according to claim 1, wherein from the outer surface to the center of the multi-element alloy material presents no distinct interfaces.

### Claim 5 (depends on 1)

The multi-element alloy material according to claim 1, being a compound represented by AlxCryFe0.2Mn0.2MoZNi0.2, including 0.2 mole of Fe, 0.2 mole of Mn, 0.2 mole of Ni, x mole of Al, y mole of Cr and z mole of Mo, wherein x is ranged from 0.1 to 0.4, y is ranged from 2.5 to 4, and z is ranged from 1.5 to 2.5.

### Claim 6

A method for manufacturing a multi-element alloy material, comprising:
providing a metal combination, consisting of Al, Cr, Fe, Mn, Mo and Ni;
melting the metal combination to form an alloy;
casting the alloy to form an alloy body;
subjecting the alloy body to a homogenization treatment to form a homogenized alloy body; and
subjecting the homogenized alloy body to a high temperature treatment to perform precipitation hardening at surface of the alloy body by heating, thereby forming a multi-element alloy material having a hardness gradient.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the high temperature treatment is a high-frequency rapid heating treatment.

### Claim 8 (depends on 7)

The method according to claim 7, wherein a treating temperature of the high-frequency rapid heating treatment is in a range of about 500° C. to 1200° C.

### Claim 9 (depends on 7)

The method according to claim 7, wherein the high-frequency rapid heating treatment is conducted for about 8 minutes to 20 minutes.

### Claim 10 (depends on 6)

The method according to claim 6, wherein the multi-element alloy material is a compound represented by AlxCryFe0.2Mn0.2MoZNi0.2, including 0.2 mole of Fe, 0.2 mole of Mn, 0.2 mole of Ni, x mole of Al, y mole of Cr and z mole of Mo, wherein x is ranged from 0.1 to 0.4, y is ranged from 2.5 to 4, and z is ranged from 1.5 to 2.5.

### Claim 11 (depends on 6)

The method according to claim 6, wherein from the outer surface to the center of the multi-element alloy material presents no distinct interfaces.

### Claim 12 (depends on 6)

The method according to claim 6, wherein an outer surface exhibits a surface hardness with at least 400Hv, and at least a portion having a thickness of 1 mm horizontally inward from the outer surface exhibits the surface hardness.

### Claim 13 (depends on 6)

The method according to claim 6, wherein a center of the multi-element alloy material has a core hardness of 300Hv to 500Hv, while an outer surface of the multi-element alloy material exhibits a surface hardness of 700Hv to 1200Hv.