# Detrimental Effects of βo-Phase on Practical Properties of TiAl Alloys

https://mdr.nims.go.jp/datasets/3a5a3588-603d-43f2-ae2e-244720cefb78

## File

- [metals-14-00908.pdf](https://mdr.nims.go.jp/filesets/5e883280-b730-4481-9387-edec1cb3f631/download) ([Detail](https://mdr.nims.go.jp/filesets/5e883280-b730-4481-9387-edec1cb3f631.md))

## Id

3a5a3588-603d-43f2-ae2e-244720cefb78

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-08-23T00:45:24.017423Z

## Updated at

2024-08-30T07:30:54.082948Z

## Published at

2024-08-30T07:30:54.177096Z

## Doi



## First published url

https://doi.org/10.3390/met14080908

## Date published

2024-08-09

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Detrimental Effects of βo-Phase on Practical Properties of TiAl Alloys
  title_type: original
  lang: en

## Description

- description: The TNM alloy, a βo-phase-containing TiAl alloy, has been withdrawn
    from use as a last-stage turbine blade in commercial jet engines as it suffered
    frequent impact fractures in service, raising doubts regarding the necessity of
    the βo-phase in practical TiAl alloys. Here, we evaluate the prac-tical properties
    required for jet engine blades for various TiAl alloys, and investigate the effects
    of the βo-phase thereupon. First, we explore the influence of the βo-phase content
    on the impact re-sistance and machinability for forged Ti–43.5Al–xCr and cast
    Ti–46.0Al–xCr alloys; the properties deteriorate significantly at increasing βo-phase
    contents. Subsequently, two practical TiAl al-loys—TNM alloy and TiAl4822—were
    prepared with and without the βo-phase by varying the heat treatment temperature
    for the former and the Cr concentration for the latter. In addition to impact
    resistance and machinability the creep strength is significantly reduced by the
    presence of the βo-phase. Overall, these findings suggest that the βo-phase is
    an undesirable phase in practical TiAl alloys, especially those used for jet engine
    blades, because, although the disordered β-phase is soft at high temperatures,
    it changes to significantly more brittle and harder βo-phase after cooling.
  description_type: abstract
  lang: und

## Creator

- name: Toshimitsu Tetsui
  role: author
  orcid: https://orcid.org/0000-0003-1278-5223
  organization: National Institute for Materials Science
- name: Kazuhiro Mizuta
  role: author

## Contact agent



## Publisher

organization: MDPI AG

## Managing organization



## Keyword

- subject: titanium aluminides
  schema: not_defined
- subject: impact resistance
  schema: not_defined
- subject: machinability
  schema: not_defined
- subject: creep strength
  schema: not_defined
- subject: " jet engine blades"
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Metals
  issn: '20754701'
  volume: '14'
  issue: '8'
  article_number: '908'

## Conference



## Related item



## Funding

- identifier: AS0216001
  funder_name: Japan Science and Technology Agency

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 5e883280-b730-4481-9387-edec1cb3f631
  filename: metals-14-00908.pdf
  content_type: application/pdf
  size: 6805258
  md5: 4c6e5908c891c2e2943373ff56bb3c73

## Thumbnail

fileset_id: 5e883280-b730-4481-9387-edec1cb3f631
filename: metals-14-00908.pdf