Study on crystallization kinetics of Al65Cu20Ti15 amorphous alloy

The crystallization behavior and thermal stability of amorphous phases of Al65Cu20Ti15 alloy obtained by mechanical alloying were investigated by using in-situ X-ray diffraction and differential scanning calorimetry (DSC) under non isothermal and isothermal conditions. The result of a Kissinger analysis shows that the activation energy for crystallization is 1131 kJ/mol. The higher stability against crystallization of Al65Cu20Ti15 amorphous alloy is attributed to the stronger interaction of atoms in the Al-Cu–Ti system and formed of complicated compound like Al5CuTi2 and Al4Cu9 as primary phases. The isothermal crystallization was modeled by using the Johnson–Mehl–Avrami (JMA) equation. The Avarami exponents suggest that the isothermal crystallization is governed by a three-dimensional diffusion-controlled growth.