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共晶自生复合材料的晶形转变

任志锋 , 张承甫

金属学报

自生复合材料的晶形转变受到成分过冷与曲面过冷两个因素的控制.非金属相具有较大的熔化熵且易形成小平面是改变领先相的因素,而领先相的改变则可能是晶形转变的根本原因.

关键词: 自生复合材料 , planar crystal , cellular crystal , constitutional suppercooling , curvature supercooling

TRANSFORMATION OF CRYSTAL MORPHOLOGY OF EUTECTIC COMPOSITE-IN-SITU

REN Zhifeng ZHA NG Chengfu Huazhong University of Science and Technology , Wuhan.China Professor.Division of Casting , Huazhong University of Science and Technology , Wuhan , China

金属学报(英文版)

It is clarified by experimental examination and theoretical analysis that the transformation of crystal moorphology of the eutectic Al-Cu alloy composite-in-situ seems to be judged by not only the constitutional supercooling proposed in previous literatures but also the supercooling due to the effect of curved surfaces at the solidifying from.The greater entropy of fusion and the tendency to faceted face are important features of the non-metallic phase,which may con- tribute to the leading,role of the phase during solidification.It might be the change of leading phase that changes the morphology of crystals.

关键词: composite-in-situ , null , null , null , null

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