Research on microlaser aided machinability of single crystal Beryllium cutting based on molecular dynamics

Beryllium is a typical hard cutting material because of its high hardness and brittleness. The laser allows rapid heating of the local material before removal, thus improving the machinability. In this paper, the machining properties of single crystal beryllium under different laser power were studied by using molecular dynamics (MD) method to simulate the micro-laser assisted cutting process. The cutting behavior of beryllium was characterized by cutting force, internal stress, crystal transformation in cutting area, internal dislocation of workpiece, chip and surface quality. During the cutting process, the laser promoted the crystal phase transition, revealed the reason of the significant increase in the number of 11-coordination beryllium atoms, and analyzed the change and distribution of the number of amorphous atoms in the crystal caused by the change of laser power. The effect of laser power on cutting force and equivalent stress in front of tool was investigated. The effects of laser parameters on atomic displacement and surface mass were studied by using the chip quantity and surface morphology obtained by simulation. The effect of laser on dislocation slip in crystal is studied by comparing the length and distribution region of various dislocation lines.