# Challenging the Limit of Strengthening by γ/γ′ Lattice Misfit on the High Temperature Creep Properties of Ni-Base Single Crystal Superalloy

https://mdr.nims.go.jp/datasets/301df220-6a80-4842-99f3-6380225f0f3c

## File

- [2026 Utada Challenging the Limit of Strengthening by γ-γ′ Lattice Misfit on the High Temperature Creep Properties of Ni-Base Single Crystal Superalloy.pdf](https://mdr.nims.go.jp/filesets/a45a2390-492b-4f3a-920b-29207e29a2b4/download) ([Detail](https://mdr.nims.go.jp/filesets/a45a2390-492b-4f3a-920b-29207e29a2b4.md))

## Id

301df220-6a80-4842-99f3-6380225f0f3c

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-04-20T03:26:31.109845Z

## Updated at

2026-04-20T04:48:18.943209Z

## Published at

2026-04-20T07:27:31.794664Z

## Doi



## First published url

https://doi.org/10.1007/s11661-025-08089-5

## Date published

2026-01-07

## Recorded date published

2026-5

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Challenging the Limit of Strengthening by γ/γ′ Lattice Misfit on the High
    Temperature Creep Properties of Ni-Base Single Crystal Superalloy
  title_type: original
  lang: en

## Description

- description: 'In the previous study, TMS-238MoIr achieved a creep rupture life of
    4044 h at 1100 °C / 137 MPa, more than twice that of the sixth-generation Ni-based
    single crystal superalloy TMS-238, corresponding to a temperature capability of
    1136 °C (Larson-Millar conversion by 1000 h rupture life under 137 MPa). This
    alloy was designed to enhance the high-temperature low-stress creep performance
    of TMS-238 by adding 1.5 at. % Mo and 2 at. % Ir. In this study, creep testing
    and microstructural analysis were conducted to evaluate creep properties and γ/γ′
    phase stability of TMS-238MoIr and its counterpart TMS-238MoRu (TMS-238 + 1.5
    at.% Mo and 2 at.% Ru) to understand the possibility and limit of these conceptual
    alloys. In contrast to TMS-238MoIr, TMS-238MoRu exhibited a significantly shorter
    rupture life of 870 h due to extensive TCP phase precipitation. Both modified
    alloys showed refined γ/γ′ interfacial dislocation networks, attributed to increased
    magnitude of negative lattice misfit from Mo partitioning into the γ phase. However,
    severe internal stress also induced planar faults in the γ matrix during heat
    treatment, which likely acted as nucleation sites for Topologically Closed Packed
    (TCP) phases at intermediate temperature around 900°C. TCP phase promoted void-assisted
    recrystallization and crack propagation, significantly reducing creep life of
    the concept alloys at 900 ºC and 392 MPa. These findings demonstrate that lattice
    misfit tuning must be balanced with phase stability to optimize creep performance
    in advanced Ni-base superalloys. '
  description_type: abstract
  lang: und

## Creator

- name: Satoshi Utada
  role: author
  orcid: https://orcid.org/0000-0001-6783-9968
- name: Tadaharu Yokokawa
  role: author
- name: Toshiharu Kobayashi
  role: author
- name: Michinari Yuyama
  role: author
  orcid: https://orcid.org/0000-0001-7350-2608
- name: Hiroshi Harada
  role: author
- name: Toshio Osada
  role: author
  orcid: https://orcid.org/0000-0003-1539-9264
- name: Kyoko Kawagishi
  role: author
  orcid: https://orcid.org/0000-0001-7652-9232

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Ni-base single crystal superalloy
  schema: not_defined
- subject: Creep
  schema: not_defined
- subject: Dislocation
  schema: not_defined
- subject: Time Temperature Transformation diagram
  schema: not_defined
- subject: Topologically closed packed phase
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Metallurgical and Materials Transactions A
  issn: '10735623'
  volume: '57'
  issue: '5'
  start_page: 1794
  end_page: 1812

## Conference



## Related item



## Funding

- identifier: JPNJAL1302
  funder_name: 科学技術振興機構
  description: ALCA「超合金タービン翼の直接完全リサイクル法の開発」

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## Chemical composition



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## Fileset

- id: a45a2390-492b-4f3a-920b-29207e29a2b4
  filename: 2026 Utada Challenging the Limit of Strengthening by γ-γ′ Lattice Misfit
    on the High Temperature Creep Properties of Ni-Base Single Crystal Superalloy.pdf
  content_type: application/pdf
  size: 4772457
  md5: 358b2d2bb0d89454582a515511f8bb03

## Thumbnail

fileset_id: a45a2390-492b-4f3a-920b-29207e29a2b4
filename: 2026 Utada Challenging the Limit of Strengthening by γ-γ′ Lattice Misfit
  on the High Temperature Creep Properties of Ni-Base Single Crystal Superalloy.pdf