About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation-induced Microstructural Evolution during Solid Phase Processing: Experimental and Computational Studies
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Presentation Title |
Dynamic Recrystallization in Face-centered Cubic Particles during High-velocity Impacts |
Author(s) |
Mauricio Ponga |
On-Site Speaker (Planned) |
Mauricio Ponga |
Abstract Scope |
We investigate the dynamic recrystallization of nano- and micro-particles with high-velocity impact simulations. Molecular dynamics simulations reveal that upon a critical velocity, face-centered cubic particles recrystallize due to a synchronous emission of Shockley partial dislocations, generating a complex network, which leads to recrystallization of high misorientation angle grains. Since pressure wave decays with the distance from the impacted surface, so does the grain size, generating a new microstructure with spatial gradients within the particles. Below the critical velocity, twinning dominates the deformation mechanisms. A continuum dislocation density model is employed to extrapolated to microscopic particles. The severe plastic deformation experienced by the microparticles results in large dislocation densities and recrystallized grains of varying sizes in good agreement with experiments. These findings are relevant in the context of cold-spray and suggests the possibility of tailoring microstructure by controlling their size, orientation, and impact velocity. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Modeling and Simulation |