State Key Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin, 300072, China.
Nanoscale Res Lett. 2013 Jan 5;8(1):13. doi: 10.1186/1556-276X-8-13.
Three-dimensional molecular dynamics simulations are conducted to study the nanometric cutting of germanium. The phenomena of extrusion, ploughing, and stagnation region are observed from the material flow. The uncut thickness which is defined as the depth from bottom of the tool to the stagnation region is in proportion to the undeformed chip thickness on the scale of our simulation and is almost independent of the machined crystal plane. The cutting resistance on (111) face is greater than that on (010) face due to anisotropy of germanium. During nanometric cutting, both phase transformation from diamond cubic structure to β-Sn phase and direct amorphization of germanium occur. The machined surface presents amorphous structure.
采用三维分子动力学模拟方法研究了硅的纳米切削过程。从材料流中观察到了挤出、犁耕和滞留区等现象。未切削厚度定义为从刀具底部到滞留区的深度，在所模拟的尺度上与未变形切屑厚度成比例，且几乎与加工晶面无关。由于锗的各向异性，（111）面上的切削阻力大于（010）面上的切削阻力。在纳米切削过程中，金刚石立方结构向β-Sn 相的相变和锗的直接非晶化都会发生。加工表面呈现非晶结构。
