Plastic deformability and precipitation of nanocrystallites during compression for a Cu-Zr-Ti-Sn bulk metallic glass

摘要

(Cu_(0.5)Zr_(0.425)Ti_(0.075))_(99)Sn bulk metallic glass with a glass transition temperature of 683 K and a supercooled liquid region of 47 K was synthesized by copper mold casting. The bulk glassy alloy exhibits high strength of 1810MPa and superior plasticity in uniaxial compression at ambient temperature. High resolution transmission electron microscopy for the bulk glassy sample subject to a plastic strain of 3 percent shows the formation of nanocrystallites in the glassy matrix. The plastic deformability of the (Cu_(0.5)Zr_(0.425)Ti_(0.075))_(99)Sn bulk metallic glass is attributed to the in situ precipitation of nanocrystallites during the compression.