On The Superior High Temperature Hardness of Precipitation Strengthened High Entropy Ni-Based Alloys

Te Kang Tsao, An Chou Yeh*, Chen Ming Kuo, Hideyuki Murakami

*この研究の対応する著者

研究成果: Article査読

25 被引用数 (Scopus)

抄録

The microstructure and high temperature hardness of two face-centered cubic high entropy Ni-based alloys with L12 γ′ precipitates have been studied. Both alloys exhibit higher mixing entropy and with the advantages in lower density and lower cost of raw materials than conventional Ni-based superalloys. Their γ′ solvus are above 1 150 °C, and the γ–γ′ microstructure can be thermodynamically stable after isothermal ageing from 700 to 1 100 °C for at least 500 h. By XRD peak deconvolution, positive lattice misfits between γ and γ′ have been shown till elevated temperatures. The results from nano-indentation test indicate that their highly alloyed γ′ phase have rendered more significant strengthening, and the underlying mechanism can be attributed to the higher anti-phase boundary energy. Therefore, with minor refractory additions, the bulk hardness of present alloys can surpass that of commercial superalloy from room to high temperature.

本文言語English
論文番号1600475
ジャーナルAdvanced Engineering Materials
19
1
DOI
出版ステータスPublished - 2017 1 1
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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