ISOTHERMAL CRYSTALLIZATION KINETICS OF BALL-MILLED AMORPHOUS Al-Ni-Zr ALLOY

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.