Abstract:The crystallization kinetics of Zr₄₁Ti₁₄Cu_12.5Ni₁₀Be_22.5 bulk metallic glass has been studied by using DSC and XRD. The results show that two exothermal peaks are observed when the alloy is heated to 500℃, one peak results dominantly from the formation of Ti₂Ni (α phase transition ), the other peak is mainly due to the formation of Zr₂Cu (β phase transition). At the beginning of the crystallization, the activation energy of the α phase is smaller, and it increases with increasing crystallized fraction (x_c). When x_c increases to 90%, the crystallization activation energy shows the largest value (220kJ/mol). The crystallization activation energy of the β phase remains about 227kJ/mol, as it's crystallized fraction is below 60%, and then it increases with increasing crystallized fraction, and shows the largest activation energy of 257kJ/mol,  as the x_c is 65%.

Key words: bulk metallic glass; Zr₄₁Ti₁₄Cu_12.5Ni₁₀Be_22.5 alloy; crystallization kinetics; activation energy