Molecular dynamics study on surface formation and phase transformation in nanometric cutting of beta-Sn

ZF Xue and M Lai and FF Xu and FZ Fang, ADVANCES IN MANUFACTURING, 10, 356-367 (2022).

DOI: 10.1007/s40436-022-00399-w

Atomic motion and surface formation in the nanometric cutting process of beta-Sn are investigated using molecular dynamics (MD). A stagnation region is observed that changes the shape of the tool edge involved in nanometric cutting, resulting in a fluctuation in the cutting forces. It is found that single-crystal tin releases the high compressive stress generated under the tool pressure through slip and phase transformation. The tin transformation proceeds from a beta-Sn structure to a bct-Sn structure. The effects of the cutting speed, undeformed chip thickness (UCT) and tool edge radius on material removal are also explored. A better surface is obtained through material embrittlement caused by a higher speed. In addition, a smaller UCT and sharper tool edge help reduce subsurface damage.

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