The material removal mechanism of aluminate magnesium spinel was investigated by nanoindentation and microscratch test. The hardness increases with the increase of load. The influence of scratch speed and scratch load on the removal mechanism of spinel was analyzed based on the penetration depth, tangential force and acoustic emission (AE) signal. It was found that with the increase of scratch speed, the area of elastic-plastic removal and brittle plastic transition increased. The AE signal appears at the beginning of a brittle plastic transition for the first time. Moreover, the tangential force growth rate of spinel in the elastic-plastic stage is lower than that in the brittle removal stage. The results indicated that improving scratch speed and reducing the scratch load is beneficial to reduce the range of brittle removal of spinel, thus increasing the range of plastic removal and brittle plastic transition.
To achieve the super-smooth surface of the fused silica via using the magnetorheological finishing (MRF) technique, the synergistic effect of the rotational speed, viscosity, and working gap is well investigated. According to the pressure field simulation based on the two-dimensional Reynold equation, the working gap is of remarkable importance to the surface roughness among three parameters. Furthermore, such result is also revealed by the MRF experiment. Accordingly, the optimized process parameters are identified, and the final surface roughness is achieved as low as 0.22 nm.
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