Abstract
A new twin evolution model considering the interfacial energy between matrix and twinning is introduced into a conventional crystal plasticity model in order to predict the formation of twin microstructure. The variation of interfacial energy with change of interfacial plane direction is taken into account. It can be deduced that the interfacial energy on the plane at the tip of twinning is much higher than that on any other plane. The driving force of deformation twinning is assumed to be the elastic energy stored in each twin system and the existing interfacial energy on matrix-twin interface. Using the above model, a three-dimensional FE simulation is carried out for a single crystal of pure Mg. We set the twin nucleus at the center of computational specimen, the twinning developed from the nucleus is observed. Also, the twin organization, whose shape is taking the form of plate, can be found. We discuss about the generation mechanisms of such twin microstructure.
