The Microstructure Stability of Precipitation Strengthened Medium to High Entropy Superalloys

Te Kang Tsao, An Chou Yeh, Hideyuki Murakami

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Medium and high entropy superalloys based on the Ni-Co-Fe system with strengthening L12 γ′ precipitates have been developed. The present study has shown that by controlling the elemental partitioning between γ/γ′, thermal stability of γ′ can be enhanced in the high entropy γ matrix. Most importantly, high entropy superalloys exhibit stable γ–γ′ microstructures with no TCP phases after long-term exposure at elevated temperatures. Therefore, a new alloy design space for stable γ–γ′ microstructure has been presented. Furthermore, due to relatively high content of Fe and Ti, their raw materials cost and alloy density can potentially be lower than those of conventional superalloys.

Original languageEnglish
Pages (from-to)2435-2442
Number of pages8
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume48
Issue number5
DOIs
Publication statusPublished - 2017 May 1
Externally publishedYes

Fingerprint

heat resistant alloys
Superalloys
Entropy
entropy
microstructure
Microstructure
Precipitates
precipitates
Raw materials
Thermodynamic stability
thermal stability
costs
matrices
Costs
Temperature
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

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AB - Medium and high entropy superalloys based on the Ni-Co-Fe system with strengthening L12 γ′ precipitates have been developed. The present study has shown that by controlling the elemental partitioning between γ/γ′, thermal stability of γ′ can be enhanced in the high entropy γ matrix. Most importantly, high entropy superalloys exhibit stable γ–γ′ microstructures with no TCP phases after long-term exposure at elevated temperatures. Therefore, a new alloy design space for stable γ–γ′ microstructure has been presented. Furthermore, due to relatively high content of Fe and Ti, their raw materials cost and alloy density can potentially be lower than those of conventional superalloys.

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