7. The graphs (P1-P7) below represent interatomic interaction, mechanical properties, and failure of materials under different service conditions (18 marks) P2 P3 iii t iv vi P4 P6 ix vii P7 A. Name the failure mechanism associated with the following curves: (2 marks each, total = 8) Mechanism P3(vi) |0) P4(vii) | (2) P5(viii) | (3) P6(in)