|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||2016 Technical Division Student Poster Competition
||SPG-44: Cross Slip at a Screw Dislocation Pile-up: A Concurrent Atomistic-continuum Study
||Shuozhi Xu, Liming Xiong, Youping Chen, David L. McDowell
|On-Site Speaker (Planned)
In the end of Stage II work hardening of metals, screw dislocations cross slip to escape from obstacles, reducing dislocation density and work hardening rate. Cross slip of screw dislocation is important in both FCC and BCC metals to promote ductility and toughness. Thus, the critical stress for cross slip is critical for plastic deformation of crystalline metals. In this work, a concurrent atomistic continuum method is employed to study the cross slip of screw dislocations at the leading edge of a single pile-up. The length scale that is required for dislocation pile-up is not accessible to classical atomistic simulations, which are usually applied to the case of an isolated screw dislocation. It is found that the critical stress for dislocation cross slip varies with the number of dislocations in the pile-up.
||Definite: None Selected