Effect of Aluminum Substituted by Titanium on Crystallization Behavior of Cu₄₆Zr₄₆Al₈ Amorphous Alloy

Cu₄₆Zr₄₆(Al_1-xTi_x)₈ (x=0,0.2,0.4,0.5,0.6,0.8,1.0) amorphous alloys were prepared by vacuum suction casting of copper mold. Effects of titanium substitution amount on thermal stability and crystallization behavior of the alloys were studied. The results show that with the increase of titanium substitution amount, the glass transition temperature, initial crystallization temperature and peak crystallization temperature of the alloys decreased, and shifted to the high temperature zone with heating rate increasing. When the substitution amount of titanium increased to 0.8, the crystallization process of the alloys changed from single-stage crystallization to multi-stage crystallization.The activation energy of the alloy decreased with titanium substitution amount increasing, and also the thermal stability and crystallization resistance decreased. The Laves phase formed in the alloys was the main reason for the decrease of activation energy of crystallization.