Influence of melt temperature on compressive plasticity of a Cu-Zr-Al bulk metallic glass

摘要

Cu_(47.5)Zr_(47.5)Al_5 bulk metallic glasses (BMGs) were cast from the melt temperature 1143 to 1373 K. The structure, thermal and mechanical properties of the BMGs were investigated by XRD, DSC, HRTEM, dilatometric measurements, micro-hardness tests and uniaxial compression. The results indicate that the microstructure and mechanical performance of BMGs are closely affected by the casting temperature. Proper casting temperature ensures the BMGs with large relaxed excess free volume (REFV) and nano-crystallites, which favor the plastic deformation in Cu_(47.5)Zr_(47.5)Al_5 BMGs. Regulating the preparing parameters is an important solution to good plasticity in BMGs.