The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

Te Kang Tsao, An Chou Yeh, Chen Ming Kuo, Koji Kakehi, Hideyuki Murakami, Jien Wei Yeh, Sheng Rui Jian

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

This article presents the high temperature tensile and creep behaviors of a novel high entropy alloy (HEA). The microstructure of this HEA resembles that of advanced superalloys with a high entropy FCC matrix and L12 ordered precipitates, so it is also named as "high entropy superalloy (HESA)". The tensile yield strengths of HESA surpass those of the reported HEAs from room temperature to elevated temperatures; furthermore, its creep resistance at 982 °C can be compared to those of some Ni-based superalloys. Analysis on experimental results indicate that HESA could be strengthened by the low stacking-fault energy of the matrix, high anti-phase boundary energy of the strengthening precipitate, and thermally stable microstructure. Positive misfit between FCC matrix and precipitate has yielded parallel raft microstructure during creep at 982 °C, and the creep curves of HESA were dominated by tertiary creep behavior. To the best of authors' knowledge, this article is the first to present the elevated temperature tensile creep study on full scale specimens of a high entropy alloy, and the potential of HESA for high temperature structural application is discussed.

Original languageEnglish
Article number12658
JournalScientific reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy'. Together they form a unique fingerprint.

Cite this