Enhanced very high cycle fatigue resistance of solution treated Mg–10Gd–3Y–1Zn–0.5Zr magnesium alloy containing long-period stacking ordered phase

X. H. Shao, H. Q. Liu, H. J. Yang, C. He, N. Su, Y. J. Wu, Q. Chen, X. L. Ma

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

We explored the very high cycle fatigue (VHCF) behavior of solution treated Mg–10Gd–3Y–1Zn–0.5Zr (wt. %, GWZ1031K-T4) alloy containing long-period stacking ordered (LPSO) structures. The fatigue strength of GWZ1031K-T4 alloy at 109 cycles is about 115.0 MPa, and the corresponding fatigue ratio is approximately 0.44. Crack initiation that causes fatal failure was found to occur primarily from the specimen surface in the high cycle fatigue regime and the subsurface in the very high cycle fatigue regime, accompanied by crystallographic facet formation irrespective of a lifetime. Our results reveal that the basal slip activated in the matrix grain substantially alleviated strain localization during VHCF testing. The unique microstructure, featuring block-shaped LPSO structures scattered at the grain boundary, a large amount of thin LPSO phase and stacking faults enriched with solute atoms (SFs) homogenously distributing in the alloy matrix, and supersaturated Gd and Y atoms in the nano-scale Mg layers in the grain, is proposed to account for the enhanced fatigue failure resistance of GWZ1031K-T4 alloy.

本文言語英語
論文番号100672
ジャーナルMaterialia
11
DOI
出版ステータス出版済み - 6 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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