Deformation and fracture of a Zr-Al-Cu metallic glass ribbon under tension near glass transition temperature

摘要

The high temperature tensile and fracture behavior of Zr 50 Al 40 Cu 10 metallic glass at the temperature range in the vicinity of glass transition were investigated. Tensile tests were carried out at room temperature, 350-420 ° C, and in the supercooled liquid region temperature range, respectively. Obvious plastic deformation was initiated at temperature about 80 ° C lower than the glass transition temperature. The ultimate tensile strength decreases with the increase of testing temperature and the ductility increases with temperature. At temperature higher than T g , viscous flow of Non-Newtonian fluid led to super plastic deformation behavior. The deformation process under tension was inhomogeneous, and remarkable serrations were observed on the stress-strain curve near glass transition temperature.