# US 2021/0276094 A1 · HYDROGENATION-DEHYDROGENATION METHOD FOR TiAl ALLOY AND METHOD FOR PRODUCING TiAl ALLOY POWDER

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- Number: US 2021/0276094 A1
- Document ID: US20210276094A1
- Status: Published application
- Kind: A1
- Application number: 16/319,643
- Filed: 2017-12-06
- Published: 2021-09-09
- Earliest claimed: 2016-12-07
- Assignees: Mitsubishi Heavy Industries Aero Engines, Ltd.
- Applicants: Mitsubishi Heavy Industries Aero Engines, Ltd.
- Inventors: Shintaro SOBU; Tadayuki HANADA
- Web page: https://patentgrep.com/patent/US20210276094A1

## CPC

- B22F 9/023: {Hydrogen absorption}
- B22F 9/04: starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C)
- C22C 14/00: Alloys based on titanium
- C22F 1/18: High-melting or refractory metals or alloys based thereon
- C22F 1/183: {of titanium or alloys based thereon}
- B22F 2201/013: Hydrogen
- B22F 2998/10: Processes characterised by the sequence of their steps
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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 hydrogenation-dehydrogenation method for a TiAl alloy includes performing hydrogenation treatment of the TiAl alloy in an environment of a set temperature equal to or higher than a temperature at which phase transformation to a β phase starts; and performing dehydrogenation treatment of the TiAl alloy which has been subjected to the hydrogenation treatment. The set temperature ranges from 1,100° C. to 1,600° C.

## Claims

### Claim 1

A hydrogenation-dehydrogenation method for a TiAl alloy, comprising:
performing hydrogenation treatment of the TiAl alloy in an environment of a set temperature equal to or higher than a temperature at which phase transformation to a β phase starts; and
performing dehydrogenation treatment of the TiAl alloy which has been subjected to the hydrogenation treatment
wherein the set temperature ranges from 1,100° C. to 1,600° C.

### Claim 2 (depends on 1)

The hydrogenation-dehydrogenation method for a TiAl alloy according to claim 1,
wherein the set temperature is equal to or higher than a temperature at which the TiAl alloy is completely phase-transformed to the β phase.

### Claim 3 (depends on 1)

The hydrogenation-dehydrogenation method for a TiAl alloy according to claim 1,
wherein the set temperature is a temperature lower than a melting point of the TiAl alloy.

### Claim 4

(canceled)

### Claim 5 (depends on 1)

The hydrogenation-dehydrogenation method for a TiAl alloy according to claim 1,
wherein the hydrogenation treatment is performed in an environment in which a partial pressure of hydrogen becomes equal to or higher than an atmospheric pressure.

### Claim 6 (depends on 1)

A method for producing a TiAl alloy powder, comprising:
crushing a TiAl alloy which has been subjected to the dehydrogenation treatment by the hydrogenation-dehydrogenation method for a TiAl alloy according to claim 1.

### Claim 7 (depends on 1)

A method for producing a TiAl alloy powder, comprising:
crushing a TiAl alloy which has been subjected to the hydrogenation treatment by the hydrogenation-dehydrogenation method for a TiAl alloy according to claim 1; and
performing dehydrogenation treatment of the crushed TiAl alloy.

### Claim 8 (depends on 1)

The hydrogenation-dehydrogenation method for a TiAl alloy according to claim 1, wherein the set temperature ranges from 1,300° C. to 1,600° C.