期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 120, 期 -, 页码 46-55出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2018.10.019
关键词
Magnesium alloy; Fatigue crack initiation; Corrosion; Corrosion fatigue; Hydrogen embrittlement
资金
- National Key Research and Development Program of China [2017YFB0702001, 2016YFB0301105]
- Strategic New Industry Development Special Foundation of Shenzhen [JCYJ20170306141749970]
- National Natural Science Foundation of China Projects [51871211, 51701129, 51271183, 51301172]
- Innovation Fund of Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS)
In this work, the corrosion fatigue behaviors of an as-forged Mg-6.7%Zn-1.3%Y-0.6%Zr alloy before and after solid solution treatment (T4) in 3.5 wt% NaCl solution have been investigated and compared. S-N curves showed that the fatigue strength of as-forged samples corresponding to 5 x 10(6) cycles was 30 MPa, whereas the fatigue strength of T4 samples was 50 MPa. Fracture observations showed that for the as-forged samples, fatigue cracks mainly initiated at localized corrosion sites on sample surfaces. However, for the T4 samples, the crack initiation was respectively related to the localized corrosion and TB cracking at low and high stress amplitudes.
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