|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||L-25: A Quantitative Study of Strain Glass Transition of NiTi-base Shape Memory Alloys
||Chuanxin Liang, Dong Wang, Zhao Wang, Yunzhi Wang
|On-Site Speaker (Planned)
Strain glass transition has been investigated for more than a decade. However, its physical origin at the atomic scale has not be demonstrated. Here we investigate martensitic transformation (MT) and strain glass transition in NiTi and Fe-doped NiTi shape memory alloys (SMAs) using a combination of atomistic and continuum simulations. We show that a network of confinement to the MT caused by local stress field generated by point defects regulates the nucleation and growth of martensitic domains and turns the MT into a strain glass transition. In particular, we find a correlation between the critical doping concentration for strain glass transition and the type of doping atoms, which provide a useful guide to strain glass design. Our simulation results in terms of both microstructure evolution and strain state diagram agree well with experimental observations.
||Planned: Supplemental Proceedings volume