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RELATIONSHIP BETWEEN CRYSTALLIZATION TEMPERATURE AND PRE-EXISTING NUCLEI IN THE AMORPHOUS Ni-P ALLOY |
LU Ke Institute of Metal Research;Academia Sinica;Shenyang;WANG Jingtang Institute of Metal Research; Academia Sinica; Shenyang |
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Cite this article:
LU Ke Institute of Metal Research;Academia Sinica;Shenyang;WANG Jingtang Institute of Metal Research; Academia Sinica; Shenyang. RELATIONSHIP BETWEEN CRYSTALLIZATION TEMPERATURE AND PRE-EXISTING NUCLEI IN THE AMORPHOUS Ni-P ALLOY. Acta Metall Sin, 1988, 24(2): 171-175.
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Abstract According to the classical theory of phase transformation, a relation-ship between crystallization temperature (the peak temperature in the exothermiccurve of crystallization, T_p) and the density of pre-existing nuclei in the sample,N_0, was derived in the crystallization process dominated by growth of nuclei: T_P~2exp(-E_g/RT_P)=L/N_0~(1/3)where Eg is the activation energy for growth of nuclei, L is a constant and R isthe gas constant. Different number of preexisting nuclei was formed by pre-anneal-ing treatment of a Ni-P glass at a temperature about 50K lower than crystalliza-tion temperature for different time. By means of a DSC determination, the crystal-lization temperature of as-quenched and the preannealed samples were obtained andit was found that the new equation successfully agrees with the experimental results.And the growth rate of crystal nuclei in the Ni-P glass can be estimated from therelationship. The onset temperature, T_x, decreases and the difference between T_p and T_x,△T_(px)=T_p-T_x, increases with the increase of annealing time.
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Received: 18 February 1988
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1 Greer A L. Acta Metall. 1982; 30: 171 2 Greer A L, Drehman A J. Acta Metall, 1984; 32: 323 3 Kiminami C S, Sahm P R. Acta Metall, 1986; 34: 2129 4 Baricco M, Battezzati L, Marino F, Riontino G. In: Steeb S, Warlimont H eds. Proc 5th Int Conf on Rapidly Quenched Metals, 1985: 239 5 Christian J W. The Theory of Transformation in Metals and Alloys, London: Pergamon, 1965 6 Henderson D W. J Non-Cryst Solids. 1979; 30: 301 7 Kelton K F, Greer A L, Thompson C V. J Chem Phys, 1983: 79: 6261 8 Lu Ke (卢柯), Wang Jingtang (王景唐). J Mater Sci, to be Published 9 Lu Ke (卢柯), Wang Jingtang (王景唐). Scr Metall, 1987; 21: 1185--1188# |
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