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Precipitate and microstructure evolution in friction stir welding of 2195-T8 aluminum alloy was characterized by transmission electron microscopy. The results show that precipitations in the base metal primarily consist of T 1 (Al 2 CuLi) platelets and small amounts of θ′ (Al 2 Cu) and τ 2 (Al 7 Cu 2 Fe) phase. In the heat affected zone (HAZ), these...
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