Polycrystalline aluminum elements with optical surface quality are widely used in optical fields, such as inertial confinement fusion (ICF) fusion target and optical reflection mirrors, etc. However, the surface height difference induced by elastic deformation after cutting strongly affect the surface quality of polycrystalline aluminum precision parts. In this paper, a crystal plasticity finite element (CPFE) model of the single point diamond cutting for bi-crystal aluminum material was firstly established through the software ABAQUS with the VUMAT subroutine. The surface height difference in diamond cutting of bi-crystal aluminum was investigated by the FE simulations. The surface height difference between grains after machining was extracted from the simulation results, and the suppression law of height difference caused by material properties and cutting parameters was investigated, which provides a theoretical basis for realizing high-quality surface control.
Diamond material has been widely used in the manufacture of high performance optical components due to its excellent mechanical and optical properties. CVD diamond can be used as inertial confinement fusion (ICF) target, X-ray lens of the fourth-generation light source, and infrared window, etc. In order to achieve high quality manufacturing of CVD diamond components, laser-induced graphitization technology can be used to improve the machinability of CVD diamond surface. In this paper, the surface generation mechanism of CVD diamond under laser irradiation were studied by molecular dynamics (MD) simulation. Firstly, a model of polycrystalline CVD diamond under laser ablation was established to reveal removal and evolution of surface materials at the atomic level. The MD simulation results with different grain sizes under laser irradiation were compared, and the influence of grain boundaries and grain size on laser graphitization was determined. Finally, the laser machining processes of CVD diamond were simulated under different laser spot diameters, and the influence of laser area on the graphitization degree of CVD diamond surface was analyzed.
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