Deformation behavior of Mg67Zn28Ca5 metallic glass at near supercooled liquid region

A systematic study of Mg67Zn28Ca5 amorphous alloy was made at near supercooled liquid region with strain rates ranging from 10−6 to 10−3 s−1. Compressive deformation behavior showed a transition from inhomogeneous to homogeneous flow. The strain rate sensitivity below the glass transition temperature was approximately 0.27, while in the supercooled liquid region, strain rate sensitivity approached a value of 1. Crystallinity and phase presence in material, were examined by XRD, DSC and TEM. before and after deformation.

► Deformation behavior of Mg67Zn28Ca5 amorphous alloy is studied over various strain rates and temperatures.
► The deformation behavior transits from inhomogeneous to homogeneous flow. For homogeneous flow, the strain rate sensitivity changes significantly as the temperature increases to above the glass transition temperature.
► The homogeneous deformation is fitted by Argon’s Shear Transformation Zone model.