Effect of heat treatments on the microstructural evolution of a single crystal high-entropy superalloy

Takuma Saito, Yung Ta Chen, Yuji Takata, Kyoko Kawagishi, Wei Che Hsu, An Chou Yeh, Hideyuki Murakami

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The effect of solution heat treatment as well as primary and secondary aging treatment conditions on the microstructural evolution of a high-entropy superalloy was investigated. The as-cast sample shows coarsened γ precipitates and other extra phases at interdendrite region due to microsegregation. This microsegregation makes γ solvus unclear and decreases the solidus. After conducting the solution treatment determined in this study, primary aging conditions showing an aligned cubic γ phase at 1050C for 4 h and random spherical γ precipitates at 950C for 20 h in similar size were found. By using both samples, secondary aging conditions showing coarsened secondary γ precipitates and γ particles inside the γ precipitates at 800C for 20 h and fine secondary γ precipitates at 850 and 870C for 20 h were found.

Original languageEnglish
Article number1600
Pages (from-to)1-17
Number of pages17
JournalMetals
Volume10
Issue number12
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Gamma prime
  • Heat treatment
  • Microstructure
  • Single crystal
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)

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