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Meeting MS&T23: Materials Science & Technology
Symposium Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales V
Presentation Title Unravelling the Nucleation and Growth Mechanism of {11-22} Twin in Titanium
Author(s) Andriy Ostapovets, Ritu Verma, Anna Serra
On-Site Speaker (Planned) Ritu Verma
Abstract Scope {11-22} Twin is the predominant twinning mode in hcp metals such as Ti, Zr and Mg under <c> axis compression. We analyze the {11-22} twin nucleation in Ti by reverse 𝛼-𝜔-𝛼 phase transformation. The twin nucleated by this mechanism can grow by the migration of the {11-22} twin boundary. This migration is mediated by the gliding of line defects with step and dislocation character, i.e. b3/3 disconnection, along with {11-22} twin boundary. Their structure can be interpreted as a pair of disconnections (bt and bt*) i.e. dissociated core of b3/3 disconnection, which contains 𝜔-phase structure inside. These studies reveal the role of 𝜔-phase in the connection with nucleation and growth mechanism of {11-22} twin boundary. These results clarify the uncertainties with the growth of the {11-22} twins.


A Rule-free Computational Prediction of the Slip-interface Reaction and the Subsequent Microstructure Evolution in Heterogeneous Materials under Deformation
An Investigation on the Microstructural Uncertainty in Molecular Dynamic Simulations of Polycrystalline Nickel
Assessing the Predictive Capabilities of Precipitation Strengthening Models for Deformation Twinning in Mg Alloys Using Phase-field Simulations
Coupled Crystal Plasticity and Phase-field Fracture Model for Single Crystal Plastic Deformation and Failure Prediction
Crystal Plasticity Modeling of Ti-6Al-4V Alloy under Uncertainty with Surrogate Optimization and Experimental Validation
Deformation Behavior of Lightweight Clad Sheet: Experiment and Modeling
Diffusion in Curved Grain Boundaries
Effects of Defects on Stress- and Thermally-induced Martensitic Transformation of Nanocrystalline NiTi Alloys: A Molecular Dynamics Study
From Anti-Arrhenius to Arrhenius Behavior in a Dislocation-obstacle Bypass
Hole Expansion Testing of Thin Sheet Materials at Various Strain Rates for Advanced Constitutive Model Calibration
Micromechanical Modeling of Additively Manufactured Inconel 625 Informed by in situ High-energy X-ray Diffraction
Misorientation Effects in Single Crystal Plasticity Finite Element Modeling
Monte Carlo Grain Growth Simulations of Discontinuous Changes in Grain Boundary Velocity Induced by Grain Boundary Transformations
Plastic Deformation and Failure Predictions of Al-6061 with Inhomogeneities Using Finite Element Modeling Techniques Across Different Length Scales
Prediction and Quantification of Suzuki Segregation at Stacking Faults in FCC-based Alloys and Compounds
Prediction of Forming Limits for Austenitic Stainless Steel Tubes
Quantifying the Role of Coarse Intermetallic Particles on Twinning Behavior
The Role of Plastic Anisotropy on the Reorientation Trajectories of BCC Polycrystals
Unravelling the Nucleation and Growth Mechanism of {11-22} Twin in Titanium
Validation Experiments Developed for Casting Modeling

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