|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations in Multi-component Systems: An MPMD Symposium Honoring Gary R. Purdy
||Molecular Dynamics Simulation of fcc/bcc Interface Migration in Pure Iron
||Zhipeng Sun, Fu-Zhi Dai, Ben Xu, Wen-Zheng Zhang
|On-Site Speaker (Planned)
Habit planes of Widmanstätten precipitates in many alloys have been found to be characterized with a single set of dislocations, as described by O-line interfaces. The migration mechanism of this type of habit planes, which is essential to the full understanding the precipitation process, is unclear. We investigate the migration of O-line interfaces of various Burgers vectors in an fcc to bcc transformation in pure Fe by molecular dynamics simulations. The movement of dislocations was followed by identifying the dislocation core using singular value decomposition of Nye tensor. The dislocations in different interfaces were found behaving differently. While shear-coupled migration was observed from all cases, the amount of the shear was in agreement with the Phenomenological Theory of Martensite Crystallography for O-line interface with Burgers vector f/2. The mobility and activation energy of these O-line interfaces at low and medium temperatures were calculated.
||Planned: A print-only volume