Abstract
The Al-Zn-Mg alloys and Al-Cu-Mg alloys are typical age-hardening alloys. These alloys have been used in aircraft because of their high strength and light weight. However, Al-Zn-Mg alloys in T6-temper are susceptible to stress corrosion cracking (SCC). Hydrogen embrittlement results in crack propagation in SCC of Al-Zn-Mg alloys. However, the mechanism of hydrogen embrittlement has not been elucidated yet. On the other hand, Al-Cu-Mg alloys are not sensitive to hydrogen embrittlement, although yield stress in Al-Cu-Mg alloys are as high as in Al-Zn-Mg alloys. In this study, hydrogen behavior in tensile-deformed Al-Cu-Mg alloys was investigated by hydrogen microprint technique. As a result, silver particles were observed on some grain boundaries.
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