The 6005A-T6 aluminum alloy was friction stir welded, and the peak temperature as well as microstructure was examined for the joints. A special attention was devoted to the precipitates evolution within different zone...The 6005A-T6 aluminum alloy was friction stir welded, and the peak temperature as well as microstructure was examined for the joints. A special attention was devoted to the precipitates evolution within different zones after post-weld natural aging time for 6 months. In the nugget zone （NZ） experiencing the highest peak temperature, the β′ precipitates dissolved into a-Al matrix and the GP zones re-precipitated after natural aging. In the thermo-mechanically affected zone （TMAZ）, which is characterized by a high density of dislocation, the Q＇ phases precipitated and part of them dissolved into α-Al matrix during FSW and the GP zones heterogeneously re-precipitated on dislocations after natural aging. The heat- affected zone （HAZ） contains the coarsening of β′ precipitates, the transformation of β″ to β′ and the precipitation of Q＇.展开更多
文摘The 6005A-T6 aluminum alloy was friction stir welded, and the peak temperature as well as microstructure was examined for the joints. A special attention was devoted to the precipitates evolution within different zones after post-weld natural aging time for 6 months. In the nugget zone （NZ） experiencing the highest peak temperature, the β′ precipitates dissolved into a-Al matrix and the GP zones re-precipitated after natural aging. In the thermo-mechanically affected zone （TMAZ）, which is characterized by a high density of dislocation, the Q＇ phases precipitated and part of them dissolved into α-Al matrix during FSW and the GP zones heterogeneously re-precipitated on dislocations after natural aging. The heat- affected zone （HAZ） contains the coarsening of β′ precipitates, the transformation of β″ to β′ and the precipitation of Q＇.
