|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||In Situ Electron Microscopy Investigation on Plastic Deformation in a Metastable Beta Titanium Alloy
||Kui Du, Tingting Yao, Miao Song, Yulin Hao, Rui Yang, Hengqiang Ye
|On-Site Speaker (Planned)
Martensitic transformation and deformation twinning are investigated in Ti-24Nb-4Zr-8Sn alloy with in situ tensile deformation in scanning and transmission electron microscopes. In situ transmission electron microscopy observations combined with finite element method calculation reveal that three deformation mechanisms, martensitic transformation, deformation twinning and kinks of martensite lamellae, are activated with the increase of applied stress/strain. Among them, deformation-induced martensitic transformation dominates the early-stage deformation. As the stress increasing, deformation twinning is activated and becomes the dominating deformation mechanism afterward. Interactions between dislocation slips and martensite/twin lamellae are likely responsible for the strain hardening. Deflection of macro-cracks in the metastable titanium alloy during high cycle fatigue is observed and associated with single variant martensitic transformation at crack tips.
||Planned: Supplemental Proceedings volume