Abstract
The applicability of Johnson-Mehl-Avrami(JMA) model to the crystallization kinetics of Zr 60Al 15Ni 25 bulk amorphous alloy is investigated by differential scanning calorimetry(DSC) under isochronal and isothermal conditions. A criterion x m, at which a defined function z( x) exhibits the maximum value, is introduced to check the validity of JMA model to the kinetics analysis. The value of x m has a constant of 0.632 for JMA model. It is found that the values of x m at different isothermal annealing temperatures (743, 748, 753 and 758 K) are almost near 0.632, which indicates that the isothermal crystallization kinetics can be modeled by JMA equation. However, the values of x m at different heating rates (10, 20, 30 and 40 K/min) are about 0.52, implying that JMA model is not valid to the isochronal crystallization kinetics. The reason why the JMA model is not valid to the isochronal crystallization kinetics is discussed.
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