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Meeting MS&T21: Materials Science & Technology
Symposium Multi Scale Modeling of Microstructure Deformation in Material Processing
Presentation Title Study of Near Boundary Gradient Zones in an Aluminum Alloy Using Strain Gradient Crystal Plasticity and Experiments
Author(s) Namit Narasimhan Pai, Indradev Samajdar, Anirban Patra
On-Site Speaker (Planned) Namit Narasimhan Pai
Abstract Scope Geometrically necessary dislocations (GNDs) are created at grain boundaries for the accommodation of the lattice mismatch. Pileup of GNDs at grain boundaries results in a back stress, leading to the development of near boundary gradient zone (NBGZ) in metals. These regions generally experience higher deformation than the grain interiors. The current work proposes a dislocation density-based strain gradient crystal plasticity framework for simulating the NBGZs and their effect on the evolution of local and aggregate mechanical properties. The model uses electron back scattered diffraction (EBSD) patterns as input microstructures and then compares the evolution of misorientations and GND densities between the simulated and experimental microstructures. The combined modeling and experimental framework is used to study deformation in several grain clusters of an aluminum alloy during interrupted tensile testing and to study the effect of misorientation between neighboring grains on the development of NBGZs.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Crystal Plasticity-based Forming Limit Prediction for Ultra-thin Bipolar Plate for Proton Exchange Membrane Fuel Cells
Crystal Plasticity Modeling of Twin Variant Selection in HCP Magnesium
Enabling Accurate Coarse-grained Atomistic Simulation of Defect Behavior in Random Alloys
Finite Element Simulation of Grain Growth with an Arbitrary Grain Boundary Energy and Explicit Grain Boundary Representation
Hot Deformation Microstructure and Processing Map of Cast Ni-based Superalloy IN-100
Microstructural Evolution from Hot Torsion Tests for Material Modeling and Parameterization
Multi Scale Modeling with Microstructure Characteristics of Martensitic Steel for Rolling Contact Fatigue Life Prediction
Numerical Studies of the Effect of Phase Stability on the Deformation Behavior of FeMnNiCoMo High Entropy Alloy
Sensitivity Analysis, Identification and Validation of the Stochastic Model Describing Evolution of Microstructural Parameters during Hot Forming of Metallic Materials
Study of Near Boundary Gradient Zones in an Aluminum Alloy Using Strain Gradient Crystal Plasticity and Experiments
The Formation of Irradiation Induced Defects in NiTi and their Effects on the Martensitic Transformation
The Role of the Initial Digital Microstructure Generation Algorithm in the Cellular Automata Static Recrystallization Predictions
Using Martensite Crystallography to Determine Transformation: Induced Deformation of Ferrite In Dual-phase Steels

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