期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 137, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105655
关键词
Aluminum alloy; Corrosion pit; Fatigue; Micro-crack; In-situ SEM observation
资金
- National Natural Science Foundation of China (NSFC) [11972364, 11502285, 51971242]
- Science Foundation Ireland (SFI) [14/IA/2604]
- Fundamental Research Funds for the Central Universities (FRFCU) [3122014H006]
Fatigue micro-cracking behavior in pre-corroded AA7075-T7651 is analyzed by in-situ scanning electron microscopy (SEM) observation and SEM-based fractography. The experimental results show that (i) fatigue microcracks nucleated mainly from inclusions at the specimen notch and from corrosion pits on the specimen surface, (ii) pre-corrosion severity degree and maximum stress level significantly affected the extent and time of microcrack initiation. Corrosion pits are shown to play a crucial role in fatigue micro-crack propagation, due to crack deflection (light corrosion) and crack coalescence (severe corrosion). The growth rate of minor cracks was suppressed by pre-dominant rapid propagation of the main crack.
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