Applicability of cutting theory to nanocutting of metallic glasses: Atomistic simulation

• Published in: Journal of non-crystalline solids 2020-12, Vol.550, p.120363, Article 120363
• Main Authors: Avila, Karina E., Vardanyan, Vardan Hoviki, Alabd Alhafez, Iyad, Zimmermann, Marco, Kirsch, Benjamin, Urbassek, Herbert M.
• Format: Article
• Language: English
• Subjects: Cutting; Metallic glass; Molecular dynamics; Shear angle; Shear bands
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2020.120363

•Cutting of a CuZr metallic glass is studied by molecular dynamics simulation.•A wide range of rake angles of the cutting tool is realized.•Plasticity occurs via the formation of parallel shear bands in the chip.•Our results closely follow Merchant’s theory of cutting. Using molecular dynamics simulation, we perform simulations of cutting a CuZr metallic glass at a wide range of rake angles. Plasticity in the metallic glass is governed by the formation of parallel shear bands in the chip. The chip is clearly separated from the uncut workpiece by a primary shear zone, from which the shear angle can be easily determined. The dependence of the shear angle on the rake angle and the friction angle follows closely Merchant’s theory of cutting. This agreement is particularly pronounced in the case that the force exerted on the workpiece is far from the cutting direction; this occurs for negative rake angles.