Molecular dynamics study on the atomic configuration evolution and suppression of shear bands for Zr-based metallic glass during cutting processing

Abstract

In this paper, molecular dynamics simulation method is used to reveal the deformation mechanism of amorphous alloy cutting by adding suppression tool. The results show that, in the metal glass cutting model added with suppression tool, the suppression tool can significantly inhibit the expansion of shear zone. Through changing the spacing between suppression tool and tool, the suppression of metallic glass shear zone was observed. The results show that the spacing between suppression tool and tool had little influence on the shape of cutting force curve. The smaller the spacing between suppression tool and tool, the more stable the short-range ordered structure and medium-range ordered structure of metallic glass, the more stable the amorphous phase number, the less the atomic migration, and the less prone to shear zone. In addition, when the cutting speed is high, the time required for the cutting tool to reach the same distance decreases, the cutting force changes significantly, the amorphous structure of the metal glass increases, the atomic bond energy breaks, the strain rate in the shear region increases, and the plastic deformation capacity is greater. Therefore, reducing the cutting speed can effectively inhibit the expansion of shear transformation zone and the formation of shear zone.