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Meeting MS&T21: Materials Science & Technology
Symposium Deformation-induced Phase Transformations
Presentation Title Intrinsic Coupling between Deformation Twinning and Phase Transformation in NiTi Shape Memory Alloys and Metastable Beta Ti-alloys
Author(s) Yipeng Gao, Qianglong Liang, Yufeng Zheng, Dong Wang, Michael Mills, Hamish Fraser, Yunzhi Wang
On-Site Speaker (Planned) Yunzhi Wang
Abstract Scope In addition to conventional dislocation plasticity, mechanical twinning and structural phase transformations are another two important plasticity carriers. In this presentation, we employ a combination of phase-transition-graph (PTG) analysis and TEM characterization to study systematically the deformation modes arising from the interplay between mechanical twinning and phase transformation. Using NiTi shape memory alloy and metastable beta Ti-alloy as examples, we show that mechanical twinning and phase transformations are intrinsically coupled in the symmetry-breaking processes, which results in multiple interconnected transformation and deformation pathways and characteristic twinning modes. This study not only reveals the physical origin of unique twinning modes and extended core structures of twin boundaries (e.g., nested twins) observed in experiments, but also provides new insights into the linear super-elasticity of cold-rolled NiTi and enhanced plasticity of metastable beta Ti-alloys through coupled twinning and transformation pathway coupling.


Accounting for Phase Transformation in Plastic Anisotropy Modeling of SS316L
Analysis of Stress State of Plastic Medium Influence on Structural Transformations in Low-alloy Steels
Ausforming of Ferrium M54 Ultra-high Strength Steel
Engineering Microstructures for Conventionally and Additively Manufactured Ni-based Superalloys
Influence of 3D Microstructure on Deformation-induced Martensitic Transformation Studied by In Situ High-energy Diffraction Microscopy and Crystal Plasticity Modeling
Intrinsic Coupling between Deformation Twinning and Phase Transformation in NiTi Shape Memory Alloys and Metastable Beta Ti-alloys
Localized Phase Transformation at Stacking Faults and the Corresponding Alloy Design Strategy
P1-18: Bimetallic Billets for Magnesium-thermal Production of High Quality Sponge Titanium
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Solid Phase Plasticity Mechanisms in Metals and Rocks during Shear Deformation
Wire Size Effect on the Nucleation of Fatigue Cracks Near Non-metallic Inclusions in Superelastic Nitinol

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