About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Explicit Modeling of Deformation Twinning Applied to High Purity hcp Titanium |
Author(s) |
Anderson Nascimento, Akhilesh Pedgaonkar, Curt Bronkhorst, Irene Beyerlein |
On-Site Speaker (Planned) |
Anderson Nascimento |
Abstract Scope |
Mechanical twinning is an essential mode of deformation for metals with hexagonal close packed crystal structure due to their low crystal symmetry. Nucleation, propagation and growth of twins are sub-grain mechanisms that operate at widely different time and length scales, imposing an intrinsic challenge to their modeling. We present new expressions for twin propagation and growth accounting for the slip-twin interaction in the twin modes prevalently observed in hcp Ti. The model explores the thermally activated motion of twin partial dislocations as the main driving mechanism for twin growth. They are incorporated in a novel crystal plasticity finite element framework that embeds deformation twins as weak discontinuities and allows for tracking their evolution. This modeling scheme is applied to study the constitutive behavior of hcp Ti under different boundary conditions. We demonstrate how the multi-scale model allows for thermally sensitive deformation twinning and its influence in the mechanical response. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Mechanical Properties, Titanium |