Formation of High Strength In-situ Bulk Metallic Glass Composite with Enhanced Plasticity in Cu₅₀Zr_47.5Ti_2.5 Alloy

Abstract

New high strength in-situ bulk metallic glass (BMG) composite with enhanced plasticity was synthesized in Cu₅₀Zr_47.5Ti_2.5 alloy. The enhanced phase is the primary crystalline precipitate, ZrCu phase. The in-situ bulk metallic glass composite with a diameter of 1.5 mm was successfully fabricated by copper mold casting Cu₅₀Zr_47.5Ti_2.5 alloy. For the as-cast rod with a diameter of 1.5 mm, the compressive fracture strength and compressive fracture strain are 2.24 GPa and 10.5%, respectively. The precipitated ZrCu phase results in the formation of the large amount of shear bands in the whole specimen. This is the reason for the high plasticity of the in situ Cu₅₀Zr_47.5Ti_2.5 BMG composite with the mixed structure of the ZrCu phase dispersing in the BMG matrix.