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

The high temperature tensile and fracture behavior of Zr50Al40Cu10 metallic glass at the temperature range in the vicinity of glass transition were investigated. Tensile tests were carried out at room temperature, 350-420 degrees C, and in the supercooled liquid region temperature range, respectively. Obvious plastic deformation was initiated at temperature about 80 degrees 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.