|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Phase Field Modeling of Functional Fatigue in Shape Memory Alloys
||Yipeng Gao, Yunzhi Wang
|On-Site Speaker (Planned)
Functional fatigue during thermal and mechanical cycling, which leads to the generation of macroscopic irrecoverable strain and the loss of dimensional stability, is a critical issue that limits the service life of shape memory alloys. By analyzing symmetry breaking during austenite ⇔ martensite transformation cycling, we constructed a phase field model to reveal the physical origin of functional fatigue. The types of defects generated during the transformation cycling are predicted through a combination of crystallography analysis and phase field simulations. They include lattice dislocations and Σ grain boundaries that agree well with experimental observations in typical shape memory alloys. Based on the simulation results, strategies to improve functional fatigue resistance are suggested, and a general design criterion for the balance of functionality and durability of shape memory alloys is proposed.
||Planned: Supplemental Proceedings volume