Very-high-cycle fatigue crack initiation and propagation behaviours of magnesium alloy ZK60 |
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| Authors: | Chao He Yongjie Liu Jiukai Li Kun Yang Qiang Chen |
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| Affiliation: | 1. School of Architecture and Civil Engineering, Chengdu University, Chengdu, People's Republic of China;2. Micromechanics Laboratory, Faculty of Engineering, Kyushu University, Fukuoka, Japan;3. Key Laboratory of Deep Earth Science and Engineering, Ministry of Education, Sichuan University, Chengdu, People's Republic of China;4. Micromechanics Laboratory, Faculty of Engineering, Kyushu University, Fukuoka, Japan |
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| Abstract: | 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. |
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| Keywords: | Fatigue crack initiation fatigue crack propagation rate magnesium alloy very-high-cycle fatigue |
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