期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 167, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.107331
关键词
Titanium alloy; Very high cycle fatigue; Twinning; Nanograins; Cracking mechanism
This paper reveals that nanograins are present in locally high-stress areas during the very high cycle fatigue of TC17 alloy, and nanograin formation is mainly attributed to twinning. The locally high stress induces twinning or slip in preferentially oriented alpha grains. Subsequently, the interaction between twin systems or dislocations leads to the formation of dislocation cells or walls, initiation of microbands, and ultimately the formation of nanograins. As a result, the regions with nanograins and the boundaries between the nanograin and coarse grain regions become preferential sites for crack initiation and early growth. Finite element analysis demonstrates the fatigue cracking behavior related to nanograins.
This paper shows that nanograins appear in a locally high-stress region for very high cycle fatigue of TC17 alloy, and twinning is a main contributor to nanograin formation. The locally high stress results in twinning or slip in preferentially oriented alpha grains. Then, the interaction between twin systems or dislocations induces the forma-tion of dislocation cells or walls, nucleation of microbands, and finally the nanograins. As a result, the nanograin regions and the boundaries between the nanograin and coarse grain regions become preferential sites for crack initiation and early growth. The finite element analysis demonstrates the nanograin-related fatigue cracking behavior.
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