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Song, HP,Liu, CC,Zhang, H,Du, J,Yang, XD,Leen, SB
2020
August
International Journal Of Fatigue
In-situ SEM study of fatigue micro-crack initiation and propagation behavior in pre-corroded AA7075-T7651
Published
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Optional Fields
Aluminum alloy Corrosion pit Fatigue Micro-crack In-situ SEM observation CORROSION-FATIGUE GROWTH-BEHAVIOR LIFE PREDICTION ALLOY MODEL PIT 2024-T3 7075-T6 AIR
137
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.
10.1016/j.ijfatigue.2020.105655
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