Ductile fracture of engineering alloys is a multi-stage process involving nucleation,growth and coalescence of voids across different length scales of microstructure (micron size primary particles and submicron size secondary particles)during the plastic deformation.Generally,primary inclusions debond from the metal matrix and form primary voids under small plastic deformation.When the localized deformation between primary voids is intensified,void linkage can be triggered by nucleation of a secondary population of particles on the intervoid ligament.In these multi-stage and multi-scale processes,shear coalescence of secondary voids (microvoids) plays an important role in the fracture process [1].
展开▼
