Fatigue Crack Growth Behavior and Associated Microstructure in a Metastable High-Entropy Alloy

Takeshi Eguchi, Motomichi Koyama, Yoshihiro Fukushima, Cemal Cem Tasan, Kaneaki Tsuzaki

研究成果: Conference article査読

5 被引用数 (Scopus)

抄録

High-entropy alloys (HEAs) containing different kinds of high-concentration solute atoms provide new concepts for obtaining excellent balance of strength and ductility. In particular, a metastable dual-phase HEA (Fe30Mn10Cr10Co; FCC matrix and HCP second phase) shows superior ductility and strength owing to the transformation-induced plasticity effect associated with deformation-induced HCP-martensitic transformation. In this context, the fatigue properties of metastable HEAs are to be investigated towards practical applications as structure materials. In this study, the fatigue crack growth behaviors of HEA and type 316L austenitic stainless steel (FCC single phase) were comparatively examined. The crack growth rate of HEA was comparable to that of 316L. In HEA, the fatigue crack was covered by a large amount of HCP-martensite. In general, the HCP-martensite was cracked easily because of the smaller number of slip systems. However, the negative effect of HCP-martensite did not appear in the fatigue crack growth rate of HEA. By electron channeling contrast imaging, we found that the HCP-martensite beneath the fracture surface contained significant orientation gradient and high density of dislocations, indicating that HCP-martensite in the present Fe30Mn10Cr10Co HEA had high plastic deformability and associated stress accommodation capacity.

本文言語English
ページ(範囲)831-836
ページ数6
ジャーナルProcedia Structural Integrity
13
DOI
出版ステータスPublished - 2018
外部発表はい
イベント22nd European Conference on Fracture, ECF 2018 - Belgrade, Serbia
継続期間: 2018 8 252018 8 26

ASJC Scopus subject areas

  • 機械工学
  • 材料力学
  • 土木構造工学
  • 材料科学(全般)

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