Preparation And Glass Forming Ability Study Of New Zr-Based Bulk Amorphous Alloys

In this paper, new Zr-based bulk metallic glasses were prepared by using vacuum arc furnace and copper mold casting techniques, and the glass forming ability was investigated by using XRD diffractometer and differential scanning calovimeter (DSC) analysis. Using DSC analysis, we can get some parameters that mark glass forming ability, such as glass transformation temperature T_g, crystalline temperature Tx, peak temperature T_p and melting temperature T_m. Thus, reduced glass transformation temperature T_rg (T_g/T_m), supercooled liquid section ΔT_x (ΔT_x= T_x -T_g), stability parameter S, forming trend parameter K_gl and crystal activation energy Q_x were given. Meanwhile, the glass forming ability of the new Zr-based bulk metallic glasses were discussed by using XRD diffraction. The results indicate that the glass forming ability of the Zr₅₂Cu₃₈Al₁₀ is the best one among Zr₅₂Cu₃₈Al₁₀, Zr₅₅Cu₃₅Al₁₀ and Zr₆₀Cu₃₀Al₁₀ alloy, and the glass forming ability of Zr₆₀Cu₃₀Al₁₀ is the worst. A few crystal phases were found in Zr₅₅Ni₅Al₁₀Cu₃₀ bulk metallic glass, with the increasing of the rod sample's diameter (φ3mm,φ5mm,φ10mm andφ30mm), which prove that the glass forming ability is sensitive to the size of samples. The glass forming ability of binary Zr-Cu metallic glasses was also studied. The results show that the binary Zr-Cu alloys have a favorable glass forming ability and also have an application prospect.