Effect of Grain Boundary and Crystallographic Orientation on the Stress Corrosion Behavior of an Al-Zn-Mg Alloy

Tang, Jianguo; Zhang, Yidan; Ye, Lingying; Qu, Meng; Wu, Jianshan; Zhang, Zhen; Liu, Shengdan; Deng, Yunlai

doi:10.1007/s11665-019-04050-x

Cited by 8 publications

(1 citation statement)

References 37 publications

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“…In agreement with the work of others, we find that that the cracks predominately follow the high-angle grain boundaries that separate the large fibrous grains. Tang et al found that the cracks tend to propagate at high-angle grain boundaries with a large difference in the Schmid factor of the neighbouring grains [52]. Day & Dent studied SCC and reported that cracks propagated along high-angle grain boundaries decorated with fewer, larger particles than the low-angle sub-grain boundaries [27].…”

Section: Discussionmentioning

confidence: 99%

Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

Lervik

Walmsley

Lodgaard

et al. 2020

Metals

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Stress corrosion cracking (SCC) in Cu-free Al-Zn-Mg (7xxx) aluminium alloys limits its use in many applications. In this work, we study in detail the microstructure of a peak and slightly overaged condition in an AA7003 alloy using transmission- and scanning electron microscopy in order to provide a comprehensive understanding of the microstructural features related to SCC. The SCC properties have been assessed using the double cantilever beam method and slow strain rate tensile tests. Grain boundary particles, precipitate free zones, and matrix precipitates have been studied. A difference in the SCC properties is established between the two ageing conditions. The dominating difference is the size and orientation of the hardening phases. Possible explanations correlating the microstructure and SCC properties are discussed.

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Section: Discussionmentioning

confidence: 99%