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Stress corrosion cracking and corrosion fatigue cracking behavior of A7N01P‐T4 aluminum alloy
Author(s) -
Shen L.,
Chen H.,
Xu L.D.,
Che X.L.,
Chen Y.
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709527
Subject(s) - materials science , corrosion , metallurgy , grain boundary , stress corrosion cracking , environmental stress fracture , crack closure , cracking , fracture mechanics , alloy , hydrogen embrittlement , corrosion fatigue , stress (linguistics) , microstructure , scanning electron microscope , stress concentration , embrittlement , composite material , linguistics , philosophy
A modified single edge notch tension (SENT) specimen exposed to saline environment was used to investigate the stress corrosion cracking and corrosion fatigue cracking behavior of A7N01P‐T4 aluminum alloy. The crack propagation rate was determined, the microstructure, crack growth path, and the fracture surfaces of specimens were examined by optical microscopy (OM) and scanning electron microscopy (SEM). The results showed that the stress corrosion cracking rate of A7N01P‐T4 alloy in 3.5% NaCl was three orders lower than that of corrosion fatigue crack propagation rate. Mg and Zn segregation at the grain boundaries increased the stress corrosion crack susceptibility. The grain orientation had a significant effect on the crack propagation performance, and the high angle grain boundaries were susceptible to cracking. Hydrogen embrittlement was the primary cause of stress corrosion crack and corrosion fatigue crack propagation.