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.
It is clarified by experimental examination and theoretical analysis that the trans-formation of crystal morphology of the eutectic Al-Cu alloy composite-in-situ seems to be judgedby not only the constitutional supercooling proposed in previous literatures but also the supercoolingdue to the effect of curved surfaces at the solidifying front. The greater entropy of fusion and thetendency to faceted face are important features of the non-metallic phase, which may contributeto the leading role of the phase during solidification. It might be the change of leading phase thatchanges the morphology of crystals.
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