ISOTHERMAL CRYSTALLIZATION KINETICS OF BALL-MILLED AMORPHOUS Al-Ni-Zr ALLOY
GAO WEN-LI (高文莉)a, DU YOU-WEI (都有为)a, WANG KAI-YANG (王开阳)b, QUAN MING-XIU (全明秀)b, WANG JING-TANG (王景唐)b
a Department of Physics, Nanjing University, Nanjing 210093, China; b State Key Laboratory for Rapidly Solidified Nonequilibrium Alloys, Institute of Metal Research, Academia Sinica, Shenyang 110015, China
Abstract The isothermal crystallization kinetics of amorphous Al-Ni-Zr alloy produced by mechanical alloying was studied by means of differential scanning calorimetry. Accordiag to Arrhenius equation, the apparent activation energy was calculated. The isothermal crystal-lization kinetics follows Johnson-Mehl-Avrami equation with n=2.00 within 0.15 < x < 0.85, x being the volume fraction crystallized. For understanding the isothermal crystalization process in detail, the concepts of local Avrami exponent and local activation energy have been introduced into this Al-Ni-Zr system.
Received: 11 January 1994
Accepted manuscript online:
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