Abstract
In the present work, isothermal phase transformation has been studied for Zr50Cu43Ag7 (at%) amorphous alloy. The crystallization enthalpy ΔHx released in phase transformation is calculated. Meanwhile, the incubation time τ and the end time tce of crystallization become shorter with the increasing annealing temperature. The maximum rates of crystallization [df/d(tIso-τ)]max, the crystallization volume fraction fmax and time tmax corresponding to [df/d(tIso-τ)]max are obtained. The local activation energy E(f) decreases firstly for 0 <f< 0.1, then E(f) remains essentially unchanged for 0.1 <f< 0.8 and finally, E(f) sharply decreases with further crystallization transformation. In addition, it is found that the crystallization mechanism for Zr50Cu43Ag7 amorphous alloy is interface-controlled growth.
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