A Multiscale Crystal Plasticity Finite Element Framework for the Representation of Slip and Deformation Twinning in HCP Metals

摘要: Dislocation slip and deformation twinning are the primary mechanisms by which plastic deformation takes place in metallic materials. Deformation twinning plays an especially important role in HCP metals such as titanium, where combinations of prismatic, basal and pyramidal slip may be insufficient to accommodate imposed plastic strains, particularly at low temperatures and/or under high-strain rate conditions. In addition, the reorientation of the crystallographic lattice and the introduction of twin-matrix boundaries during the twinning process affect the anisotropy of the material’s response and its hardening behaviour, respectively. Recognizing the importance of twinning, researchers have made numerous efforts over the years to account for this deformation mechanism making use of homogenization schemes [1, 2]. The limitations of such approaches have motivated recent developments [2] where twins are …