Transfer and incorporation of dislocations to 3 tilt grain boundaries under uniaxial compression

Shibutani, Yoji*; Hirouchi, Tomoyuki*; Tsuru, Tomohito   

Microscopic yielding can be realized by the transfer of a dislocation across a grain boundary (GB), or by incorporation between the residual GB dislocation and the dislocations nucleated in the near-field of a GB due to the applied stress. In the present paper, a new boundary interaction criterion of - or '-value is proposed, which considers both the contributions of the geometric relationship between two grains and a GB, and the stress state applied to the near-field of a GB. This value and the others so far proposed were calculated for 110, 100, and 111 symmetric tilt grain boundaries under uniaxial compression normal to the GB. The dynamic transfer and incorporation of the dislocations nucleated under uniaxial compression normal to the GB plane were then examined using 3-dimensional molecular dynamics simulations.