Crack propagation and the material removal mechanism of glass-ceramics by the scratch test

- A scratch method of using manufactured single-grit by FIB is proposed.
- Median crack, lateral crack in subsurface and radial crack in the surface are found.
- Propagation and interaction between cracks are two main types of material peeling.
- Propagation of cracks between adjacent scratches results in material peeling.
- Interaction of cracks depends on scratch depth and separation of adjacent scratches.