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In the present study, the microstructure and corrosion behavior of friction stir welded (FSW) 2A97-T3 Al-Cu-Li alloy are investigated. It is found that the welding process promotes the formation of high population T1 phase (Al2CuLi) precipitates in thermomechanically affected zone (TMAZ), which consequently becomes susceptible to localized corrosion. Localized corrosion in TMAZ initially occurs at high angle grain boundaries, which are decorated by T1 phase (Al2CuLi) precipitates and, subsequently, develops into grain interior through preferential dissolution of T1 phase precipitates.
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Zhang et al. (2017) studied this question.
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