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Thermal and mechanical characterizations of a substrate-free focal plane array *Cheng Teng(程 腾) a) , Zhang Qing-Chuan(张青川) a) † , Chen Da-Peng(陈大鹏) b) , Shi Hai-Tao(史海涛) a) , Gao Jie(高 杰) a) , Qian Jian(钱 剑) a) , and Wu Xiao-Ping(伍小平) a) a)

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The effect of solution treatment on the spatial behavior of the Portevin-Le Chatelier effect in Al-Cu alloys is investigated under constant applied driving velocity. During the initial stage of plastic deformation, the PLC deformation band nucleates in the neighborhood of the middle of the transverse direction of specimen. And multiple bands will exist simultaneously in the specimen when deformation develops, whose width is narrower and incline at a larger angle than those in annealing treated material. At high applied velocity, the PLC deformation band propagates continuously first, and then nucleates randomly in the specimen.