Abstract: The microscopic analyses of polycrystalline material at high temperature were carried out. The crystal plasticity model proposed by Asaro and Needleman was applied to a polycrystal model in the finite element simulation and the crystal slip system was randomly provided for each crystal. The grain boundary sliding, which was characteristic at high temperature, was also taken into account. It was shown that the inhomogencous deformation develops over the polycrystal and that the strain concentration appears around the triple point of crystal grain boundary.

Key words: crystal plasticity, finite element method, grain boundary