Quiz 2

Majority of the questions on Wear. Crack propagation in Anisotropic crystal structures is primarily created by residual stress at grain boundaries due to expansion mismatch, hence Intergranular cracking is favoured. Alumina has corrundum structure and hence anisotropic (hexagonal side length is not equal to the vertical plane separation length). Whereas Garnet is cubic structure although there may be distrotions.