A structural investigation of the crystallization products of an amorphous Ni-P alloy

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Abstract
The crystallization product of an amorphous ni80P20 alloy has been studied using X-ray diffraction and transmission electron microscopy (TEM). The crystallization product is composed of two phasese: body-central tetragonal (b.c.t.) Ni3 P compound and face-central cubic (f.c.c.) Ni austenite, and a new set of orientation relationships between them has been obtained: b.c.t. // f.c.c., b.c.t.// f.c.c. According to the orientation relationships, a possible interface model between Ni3 P and Ni crystals was proposed. An observation of the cyrstals was carried out by means of high-resolution electron microscopy (HREM). The morphology of the products is characterized by separated cyrstalline blocks of the two phases, in which Ni3 P blocks contain many kinds of defects. Different kinds of Ni-phase morphology were also analysed. Such a crystallization product which is difficult to interpret by suing the classical atom-diffusion mechanism can be understood according to the newly developed cyrstallization micromechanism. The structure relationship between the coordination clusters (in amorphous state) and the crystallization products was also discussed.

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