About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Thermodynamics and Kinetics
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Presentation Title |
Dislocation Formation Mechanism in Polycrystalline HCP Zr and Zr-2.5wt.%Nb Alloy |
Author(s) |
Cong Dai, Nana Ofori-Opoku |
On-Site Speaker (Planned) |
Cong Dai |
Abstract Scope |
The deformation-induced dislocations in polycrystalline HCP metals have a great influence on the materials mechanical properties. Many factors include grain orientations, loading conditions and grain boundary types would affect the nucleation and kinetics of these dislocations, and they are investigated by atomistic simulations based on empirical potentials. The stress strain curves, dislocation densities and stacking fault energies are calculated to study the dislocation formation mechanism and its response on the materials mechanical properties. Different types of dislocations are identified during the deformation, and they are likely formed from grain boundaries. The alloying samples are found more deformation-resistance compared to pure ones, since the alloying atoms segregated at grain boundaries would pin dislocations and make them more difficult to emit. Our work shows an approach to investigate the materials deformation behaviors by atomistic structural analysis. |
Proceedings Inclusion? |
Planned: |