Effect of microstructure inhomogeneity and crack initiation environment on the very high cycle fatigue behavior of a magnesium alloy

被引：31
作者：
Chen, Yao [1 ,2 ,3 ]
He, Chao [1 ]
Liu, Fulin [1 ]
Wang, Chong [1 ]
Xie, Qing [4 ]
Wang, Qingyuan [1 ,5 ]
Liu, Yongjie [1 ,2 ,3 ]
机构：
[1] Sichuan Univ, MOE Key Lab Deep Earth Sci & Engn, Coll Architecture & Environm, Chengdu, Sichuan, Peoples R China
[2] Sichuan Univ, Failure Mech & Engn Disaster Prevent, Chengdu, Sichuan, Peoples R China
[3] Sichuan Univ, Mitigat Key Lab Sichuan Prov, Chengdu, Sichuan, Peoples R China
[4] Chengdu MCT Technol Co Ltd, Chengdu, Sichuan, Peoples R China
[5] Chengdu Univ, Sch Architecture & Civil Engn, Chengdu, Sichuan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 131卷
基金：
中国国家自然科学基金;
关键词：
Very high cycle fatigue; Fatigue crack initiation; Microstructure inhomogeneity; Fatal facet; Fatigue life; PROPAGATION BEHAVIOR; GIGACYCLE FATIGUE; MECHANISM; MG; STRENGTH; STRESS; GROWTH; INCLUSIONS; SIZE; LIFE;
D O I：
10.1016/j.ijfatigue.2019.105376
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The VHCF behaviors of an extruded magnesium alloy are investigated. Due to the microstructure inhomogeneity, fatigue damages prefer to concentrate in the few larger grains. Basal slip deformations are supposed to be responsible for the transgranular crack initiations, and form the similar faceted morphologies. Under same stress amplitude, internal failures present longer fatigue lives than surface failures due to the requirement of larger initial crack and the deceleration rate in the vacuum-like environment at specimen interior.
引用
收藏
页数：9
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