Influence of Ca Content on Ultra-High Cycle Fatigue Fracture Behavior of AMCa Magnesium Alloy

ZHANG Yanbin; SUN Dongyang; ZHANG Jiwang

doi:10.3969/j.issn.0258-2724.20170831

Volume 54 Issue 2

Jun. 2019

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Journal of Southwest Jiaotong University > 2019 > 54(2): 381-387.

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ZHANG Yanbin, SUN Dongyang, ZHANG Jiwang. Influence of Ca Content on Ultra-High Cycle Fatigue Fracture Behavior of AMCa Magnesium Alloy[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 381-387. doi: 10.3969/j.issn.0258-2724.20170831

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Influence of Ca Content on Ultra-High Cycle Fatigue Fracture Behavior of AMCa Magnesium Alloy

doi: 10.3969/j.issn.0258-2724.20170831

Received Date: 12 Dec 2017
Rev Recd Date: 15 Apr 2018

Available Online: 27 Dec 2018

Publish Date: 01 Apr 2019

Abstract

Abstract

In order to investigate the effect of Ca content on the fatigue properties of magnesium alloys, the ultra-high cycle fatigue tests were carried out for two AMCa magnesium alloys using a rotating bending fatigue machine. The fracture morphologies of the fatigue specimens were observed by using scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). Based on the experimental results, the fatigue S-N (fatigue strength-fatigue life) curves features and the fatigue fracture behavior were analyzed. Then, the influence of the Ca content on the fatigue life and fatigue crack initiation mechanism was discussed. The results indicate that the S-N curve of the AM1.77 Ca magnesium alloy shows a trend of continuous decline without a traditional fatigue limit, and the AM1.85 Ca magnesium alloy shows double S-N curve characteristics with a turning point around 130 MPa. The fatigue crack initiation mode is the surface initiation mode for the AM1.77 Ca magnesium alloy. However, the AM1.85 Ca magnesium alloy has two types of fatigue crack initiation modes, namely, the surface initiation mode and sub-surface initiation mode, which is due to the increase in the Ca content. The change that AM1.85 Ca magnesium alloy has two types of fatigue crack initiation modes is not conducive to improve the anti-fatigue performance.
- magnesium alloy,
- ultra-high cycle fatigue,
- fatigue crack initiation mechanism,
- double S-N curve

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