|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Slip Transmission in fcc/fcc Bilayers Using Phase Field Dislocation Dynamics (PFDD)
||Abigail Hunter, Yifei Zeng, Irene J Beyerlein, Marisol Koslowski
|On-Site Speaker (Planned)
We present the formulation of a phase field dislocation dynamics model designed to treat a system comprised of two fcc metals differing in moduli and lattice parameters, meeting at a common interface. We investigate the critical stress required to transmit a perfect dislocation across a bimaterial interface with a cube-on-cube orientation relationship. The calculation of the critical stress accounts for the effects of: 1) the stresses induced at the interface due to the lattice mismatch, 2) the elastic moduli mismatch, and 3) the formation of the residual dislocation. Our results show that the critical stress associated with the transmission of a dislocation from material 1 to 2 is not the same as from material 2 to 1. We find that the transmission from the material with the lower shear modulus is easier than the reverse and the degree of asymmetry in critical stress is directly proportional with the lattice mismatch.