Very-high-cycle fatigue crack initiation and propagation behaviours of magnesium alloy ZK60

被引：18
|
作者：
He, Chao [1 ,3 ]
Liu, Yongjie [2 ]
Li, Jiukai [2 ]
Yang, Kun [2 ]
Wang, Qingyuan [1 ,2 ]
Chen, Qiang [3 ]
机构：
[1] Chengdu Univ, Sch Architecture & Civil Engn, Chengdu, Sichuan, Peoples R China
[2] Sichuan Univ, Key Lab Deep Earth Sci & Engn, Minist Educ, Chengdu 610065, Sichuan, Peoples R China
[3] Kyushu Univ, Micromech Lab, Fac Engn, Fukuoka, Japan
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2018年 / 34卷 / 06期
关键词：
Fatigue crack initiation; fatigue crack propagation rate; magnesium alloy; very-high-cycle fatigue; HIGH-STRENGTH STEELS; DUPLEX STAINLESS-STEEL; VHCF REGIME; TITANIUM-ALLOY; GIGACYCLE FATIGUE; INCLUSIONS; DAMAGE; MECHANISMS; FRACTURE; SLIP;
D O I：
10.1080/02670836.2017.1407556
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The aim of this paper is to assess the very-high-cycle fatigue (VHCF) behaviour of a magnesium alloy (ZK60). Results indicate that the fatigue crack initiates from an area consisting of many distributed facets, while the region of early crack propagation is characterised by parallel traces, based on a fractographic analysis. The significant differences in morphology around the crack initiation area result from the interaction between the deformation twinning and the plastic zone at the crack tip. In addition, the fatigue crack propagation rate around the crack initiation site is also estimated based on a modified Murakami model. It is found that the formation stage for the fatigue crack is of great importance to the fatigue failure mechanism in the VHCF regime.
引用
收藏
页码：639 / 647
页数：9
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