An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys

摘要: Abstract This work describes a mechanism for the initiation of delamination cracks in Al–Li alloys based on soft/stiff character adjacent grains. Small-scale-yielding, crystal plasticity simulations divider grain configurations (L-T) reveal an elevated mean stress boundaries. increase drives sharp localization Rice-Tracey parameter to boundaries – elevation RT indicates favorable conditions void growth and triggering cracking, agreement with fractography Ritchie co-workers. Our simulation results available experimental evidence indicate initiates typically between pairs, often Bs (Bunge-convention Euler angles ϕ 1 = 131 ° , Φ 83 2 307 ) or S ( 233 151 105 orientations. The simple model material interface show that accumulation is consequence mechanics such interface, not necessarily tied inhomogeneities near GBs (such as precipitate free zones).