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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 1    March 1998

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SOLIDIFICATION PROCESS OFα(Al)-Mg2Ge PSEUDOBINARY EUTECTIC ALLOYS
Zhao Shengxu, Li Shunpu, Zhao Deqian, Pan Mingxiang and Chen Xichen

Institute ofPhysics, Chinese Academy of Sciences, Beijing100080, P. R. China

Abstract:Solidification process ofα(Al)-Mg2Ge pseudobinary eutectic alloys in Al-Mg-Ge system has been studied by directional solidification and electron microscopy techniques. It was demonstrated that the morphology of the primary crystal of phase Mg2Ge is octahedron enclosed with {111} planes and Mg2Ge is the favored nucleating phase during eutectic solidification of this alloy. The branching process during solidification fits the mechanism of branching in the preferred growth direction. First, the primary branching occurs in the [110] direction of the primary crystal of Mg2Ge, and then the second branching appears in the [110] direction of the primary branch. It progresses in this way till stable growth.

 

Key words: eutectic solidification mechanism branching preferred growth direction nucleation

ISSN 1672-7029
CN 43-1423/U

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