About this Abstract |
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. |