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

Zhi-Fu Xue; Min Lai; Fei-Fei Xu; Feng-Zhou Fang

doi:10.1007/s40436-022-00399-w

Advances in Manufacturing ›› 2022, Vol. 10 ›› Issue (3) : 356 -367. DOI: 10.1007/s40436-022-00399-w

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

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¹ State Key Laboratory of Precision Measuring Technology and Instruments, Laboratory of Micro-Nano Manufacturing Technology, Tianjin University, 300072, Tianjin, People’s Republic of China

^b laimin@tju.edu.cn

^d fzfang@tju.edu.cn

Zhi-Fu Xue is a Ph.D. candidate at the Laboratory of Micro/Nano Manufacturing Technology (MNMT), Tianjin University. He received a bachelor's degree from Northeastern University in 2017. His research interest is ultra-precision cutting.

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Min Lai is an associate professor from Tianjin University and the member in the Laboratory of Micro/ Nano Manufacturing Technology (MNMT). She received her Ph.D. from Tianjin University in 2016. Her main research interests focus on the ultra-precision machining mechanisms and micro/nano manufacturing technology.

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Fei-Fei Xu engineer in manufacturing, working in the areas of ultra-precision manufacturing and micro/nano-cutting, including the surface generation, modification, material removal, plastic deformation, and characterization.

[graphic not available: see fulltext]

Feng-Zhou Fang is a joint professor and the director of Laboratory of Micro/Nano Manufacturing Technology (MNMT) in both Tianjin University and University College Dublin. He received his Ph.D. in Manufacturing Engineering from the Harbin Institute of Technology and has been working in the field of manufacturing since 1982. He has conducted both fundamental studies and application development in the areas of micro/nano machining, optical freeform design and manufacturing, and ultra-precision machining and measurement benefiting a variety of industries in medical devices, bio-implants, optics and mold sectors.

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Abstract

Atomic motion and surface formation in the nanometric cutting process of β-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 β-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.

Keywords

β-Sn / Molecular dynamics (MD) / Nanometric cutting / Surface formation / Phase transformation

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Zhi-Fu Xue, Min Lai, Fei-Fei Xu, Feng-Zhou Fang. Molecular dynamics study on surface formation and phase transformation in nanometric cutting of β-Sn. Advances in Manufacturing, 2022, 10(3): 356-367 DOI:10.1007/s40436-022-00399-w

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