Influence of Rolling Temperature in Supercooled Liquid Region on the Surface Morphology of Zr52.5Al10Ni10Cu15Be12.5 Bulk Metallic Glass

Surface morphologies of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass after being rolled at both a temperature around Tg and near （Tx-50） K were investigated with a scanning electron microscopy. Macroscopic and microscopic observation results show that squamae, cracks, steps and wedges exist on the surface when the samples were rolled at temperatures around Tg. However, a smooth and flat surface appears when the samples were rolled at temperatures near （Tx-50） K. These results indicate that the mode of deformation in the supercooled liquid region is a partially homogeneous flow at a temperature around Tg, and a fully homogeneous one at temperatures near （Tx-50） K. According to the results, it is more feasible to roll the amorphous alloys at temperatures near （Tx-50） K to obtain parts with smooth and flat surface.