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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
Presentation Title Experimental evidence and first-principles verification of the deformation behavior of basal twist grain boundaries in Ti
Author(s) Biaobiao Yang, Samuel Hémery, Wei Shao, Victoria A. Tucker, Michael S. Titus, Miguel A. Monclús, Javier Llorca
On-Site Speaker (Planned) Javier Llorca
Abstract Scope Recent experimental evidence suggests that basal twist grain boundaries (BTGBs) are responsible for the nucleation of fatigue cracks in Ti alloys. They are composed by two hcp α crystals rotated about the [0001] axis, and separated by a grain boundary parallel to (0001). The mechanical behavior of bicrystals containing BTGBs was characterized through micropillar compression tests and the deformation mechanisms were analyzed by means of high resolution scanning and transmission electron microscopy. Shear deformation occurred by the shear glide of one basal grain over the other basal grain at very low values of the critical resolved shear stress. In order to understand this mechanism, the generalized stacking fault energy (GSFE) of coincident site lattice BTGBs with different twist angles was determined through first principles calculations of supercells. It was found that the GSFE was negligible for all coincident site lattice BTGBs and explained the negligible slip resistance.
Proceedings Inclusion? Planned:
Keywords Computational Materials Science & Engineering, Titanium, Mechanical Properties

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Atomistic Simulation of dislocation-obstacle interactions in Al0.3CoCrFeNi Multi-Principal Element Alloys.
Atomistic simulation study on the deformation behaviors of nanotwined NiMo alloys
Atomistic simulations on the dynamic recrystallisation during high-velocity impact in copper
Characterizing Variants during Phase Transformation and Twinning in BCC Microstructures during Deformation and Unloading
Computational alloy design based on dislocation plasticity
Controlling dislocation motion and nanoscale plasticity in semiconductors using electric fields and illumination
CRSS for Slip in Titanium: Theoretical Predictions and In-situ Experimental Measurements
Defect Trapping Mechanisms of Helical Dislocations: Insights from Anisotropic Linear Elasticity Theory
Design of high-performance lightweight high entropy alloys using high-throughput method
Development of An Analytical Surface Energy Model for Arbitrary (hkl) Surfaces in FCC and BCC Metals and Alloys
Development of semi-empirical interatomic potential to simulate plastic deformation in Ni-Co-Cr-Y-O system
Diffusivity and mechanical response of phase boundaries
Dislocation Core Structure from Diffuse Scattering Below the Bragg Peaks
Dislocation slip in bcc Nb from large-scale molecular dynamics simulations
Effects of Geometric Parameters and Temperature on Mechanical Properties of Single-Walled Carbon Nanotubes by Molecular Dynamics Simulation
Energy dissipation mechanisms and role of porosity in shock loaded niobium: a molecular dynamics study
Evaluation of Stacking Fault Energies and Microstructure Formation in Ni-Cr-Fe Alloys using Molecular Statics and Dynamics
Experimental evidence and first-principles verification of the deformation behavior of basal twist grain boundaries in Ti
Fatigue crack propagation in Aluminum and Steel dissimilar joints: Molecular dynamics simulation and experimental validation
Finely tunable thermal expansion of NiTi by stress-induced martensitic transformation and thermomechanical training
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Influence of single- and multiphase zinc-blende and wurtzite structures on thermal properties of semiconductors during ultrafast melt-quenching and deformation
Insights into the soft brittle-to-ductile transition in BCC metals using multiscale modeling
Integrating Atomistic Simulations with Experimental Characterization to Understand Dislocation Mechanisms in Nanoscale Dual-Phase Alloys
Investigating the Pressure-Temperature States during Shock Compression and Shock Release in Metals using Molecular Dynamics Simulations
Local Phase Transformation Strengthening in Ni-Base Superalloys
Mechanistic Transitions Governing Strength and Stability in Grain Boundary Segregation Strengthened Nanocrystalline Aluminum Alloys
Mobile dislocation mediated Hall-Petch and inverse Hall-Petch behaviors in nanocrystalline Al-doped boron carbide
Molecular dynamics simulation study on the phase transformation behaviors of additively manufactured shape-memory alloys
Multiscale models for materials at extreme conditions using physics-informed machine learning
Role of microstructure and strength on the development of slip localizations in polycrystals
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Self-healing by amorphous shear-band recovery in crystalline Al-Sm materials
Short-range Order Hardening and Enhanced Tensile Ductility in Nanocrystalline Ag by Intercalation of Amorphous Ni-rich Nanolayers
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Stability of high energy faults in Ni-based superalloys
The Effect of Crystallographic Defects on the Mechanical Performance of Nano-Metamaterials
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The Intrinsic Ductile-Brittle Transition in Metals and Alloys
The origin of photo plasticity in ZnS
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Twin Boundary Engineering in Ni-based Superalloy Thin Films
Understanding the fundamental fracture behavior in NbMoTaW and NbTaTiHf
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