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孙丽,牛凤姣,伍翠兰,赖玉香,陈江华.时效析出相微结构改变对AA2024铝合金应力腐蚀行为的影响[J].稀有金属材料与工程(英文),2019,48(9):2944~2950.[Sun Li,Niu Fengjiao,Wu Cuilan,Lai Yuxiang and Chen Jianghua.The influence of precipitation microstructure change on the stress corrosion behavior of AA2024 aluminum alloy[J].Rare Metal Materials and Engineering,2019,48(9):2944~2950.]
The influence of precipitation microstructure change on the stress corrosion behavior of AA2024 aluminum alloy
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Received:March 26, 2018??Revised:April 26, 2018
DOI:
Key words:?2024 aluminum alloy??intergranular corrosion??grain attack??stress corrosion??artificial ageing
Foundation item:国家自然科学基金资助(No. 51471067, No. 51671082, No. 11427806);国家重点研发计划资助(No. 2016YFB0300801)
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Sun Li,Niu Fengjiao,Wu Cuilan,Lai Yuxiang and Chen Jianghua??
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Abstract:
??????The effect of precipitation microstructure change on the stress corrosion behavior of AA2024 aluminum alloy was investigated by constant load stress corrosion tests, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that the T3 alloy is much more sensitive to stress corrosion than the T8 alloy. The corrosion process and precipitation microstructure change of T3 and T8 alloys were investigated by in-situ corrosion observations operated by high-angle annular dark-field scanning TEM (HAADF-STEM), which intuitively demonstrate the different corrosion morphologies: the corrosion morphology of T3 alloy is intergranular corrosion and that of T8 alloy is a combination of intergranular corrosion and grain attack. Because of the change in precipitation microstructure and corrosion mechanism, the alloys with different ageing conditions possess different stress corrosion susceptibility.