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

*この研究の対応する著者

研究成果: Article査読

77 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号12658
ジャーナルScientific reports
7
1
DOI
出版ステータスPublished - 2017 12 1
外部発表はい

ASJC Scopus subject areas

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