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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Non-equilibrium Features of Grain Boundaries
Presentation Title Effect of Neutron Irradiation on Deformation Homogeneity in Polycrystalline Materials
Author(s) Meimei Li, Xuan Zhang, Jonathan Almer, Jun-Sang Park, Hemant Sharma, Peter Kenesei
On-Site Speaker (Planned) Meimei Li
Abstract Scope Recent developments in synchrotron X-ray techniques have provided us unprecedented time and spatial resolution and in-situ capability with complex sample environments, shedding new light into the mechanisms and pathways of microstructural evolution and its correlation with material’s macroscopic behavior. Our recent study of neutron-irradiated Fe9Cr model alloy by high-energy X-ray diffraction microscopy (HEDM) revealed subgrain formation under tensile deformation and broader size distribution of subgrains in contrast to more uniform size distribution in the unirradiated specimen. The heterogeneous subgrain structure suggests that grain-scale homogeneity of plastic deformation can be significantly reduced by neutron irradiation. This 3D X-ray characterization of grains in polycrystalline bulk materials is paving the way to a better understanding of microstructural heterogeneity and localized deformation of irradiated materials, critical to the prediction of material aging and degradation and the design of irradiation-resistant new materials. An outlook of in-situ 4D characterization of irradiated materials will also be presented.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A New Mathematical Framework for Simulation of Grain Growth
Activation Volume Tensors for Atomistic Events at Grain Boundaries
An Atomistic Survey of Grain Boundary – Dislocation Interactions in FCC Nickel
Atomic-scale Study of Twin Growth in Zirconium
Changes in the Grain Boundary Character and Curvature Distributions of Nickel at Multiple Annealing Stages from Three-dimensional X-ray Microscopy
Characterization of Single Grain Boundary and Interface Mechanical Properties Using In-situ TEM
Competing Effects of Nonmetal Impurities and Planned Metallic Dopants on Grain Boundary Deformation
Continuum Framework for Dislocation Structure, Energy and Dynamics of Dislocation Arrays and Low Angle Grain Boundaries
CSL Pinning Mechanism Associated with Non-thermally Activated Mobility in Sigma 7 and Sigma 9 Grain Boundaries
Discovering the Atomic Building Blocks of Grain Boundaries Using Machine Learning
Dislocation Interactions with Bi-phase Interfaces Using Phase Field Dislocation Dynamics (PFDD)
Dislocation Nucleation from Grain Boundary: A Comparison between Conventional MD and Accelerated MD
Dislocations, Twins, Grain Boundaries and their Interactions in HCP Rhenium
Effect of Neutron Irradiation on Deformation Homogeneity in Polycrystalline Materials
Exploring the Interactions between Grain Boundaries and Precipitates in a Ni-Al Using Molecular Dynamics
Grain Boundaries Driven Far from Equilibrium by a Continuous Influx of Vacancies
Grain Boundary Factors Related to Void Formation
Grain Boundary Network Structural Metrics and Phase Transitions
Grain Boundary Spinodals: Faceting Instability and the Role of Junction Energetics
Grain Boundary Statistical Mechanics: A Disconnection Dynamics Approach
Grain Boundary Structure Characterization with the Smooth Overlap of Atomic Positions Descriptor
Grain Coarsening in Two-dimensional Phase-field Models with an Orientation Field
Mapping of 3D Grain Boundary Characteristics by LabDCT
Mechanical Behavior of (Ni,Fe)Cr2O4 Spinel Grain Boundaries Studied by Molecular Dynamics Simulations
Reconciling Grain Growth and Shear-coupled GB Migration
Structures and Transitions in BCC W Grain Boundaries
The Effect of Segregation and Precipitation on Grain Growth in Eu-doped MgAl2O4-spinel
The Influence of 3-D Structure on the Mechanical Behavior of Layered Nanocomposites
The Role of Non-equilibrium Grain Boundary Structure in Radiation Tolerance and Thermal Stability
Thermally Induced Grain Coarsening in Alpha Iron
Topological Defects in 2D Orientation-field Models for Grain Growth
Understanding the Behavior of a Polycrystalline Aggregate with Sub-crystal Resolution Using High Energy X-rays
Understanding the Effects of Hydrogen on the Plasticity of Individual Crystals within a Polycrystalline Nickel Aggregate Using High Energy X-ray Diffraction and High Pressure Torsion.
Understating the Deformation and Fracture Behaviors of Heterogeneous Lamella Structures
Unraveling Anti-thermal Behavior in a Variety of FCC Metals

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