This paper aims to investigate the initiation and distribution of dislocations and twins in the subsurface of alumina subjected to single-point scratching and to gain a deeper understanding of the mechanisms of ductile-regime grinding of alumina. It found that there generally exist three regions of dislocation and twin systems in the scratched alumina. The first region contains five independent...

The deformation characteristics of GaSb are investigated by employing nano-scratch tests to understand the material removal mechanism during ultra-precision grinding. nano-scratches obtained a cube-corner tip under two linear normal load conditions (0–30 mN and 0–60 mN). force/scratch distance-penetration depth curves chips cracks analyzed transition ductile brittle removal. In addition, maximu...

The surface quality and subsurface damage (SSD) distribution achieved with a fine-grained grinding wheel under different depth-of-cut cutting speed is experimentally studied. ground roughness (SR) investigated via white light interferometry expressed in terms of four typical values (PV, RMS, Rz, Ra). SSD characterized by the magnetorheological finishing (MRF) spot method transmission electron m...

The high plasticity of metallic glasses is highly desirable for a wide range of novel engineering applications. However, the physical origin of the ductile/brittle behaviour of metallic glasses with various compositions and thermal histories has not been fully clarified. Here we have found that metallic glasses with compositions at or near intermetallic compounds, in contrast to the ones at or ...