About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
Mechanical Behaviour of Ni and Ni3Al Free-standing and Matrix-embedded Metallic Nanoparticles at Different Temperatures |
Author(s) |
Alla Ndiaye Dieng, Celine Gerard, Jonathan Cormier |
On-Site Speaker (Planned) |
Celine Gerard |
Abstract Scope |
Nano-composite materials represent a tremendous opportunity for improving mechanical properties and/or multi-physics coupling. Nevertheless, the understanding of their deformation mechanisms is still limited, especially at lower scales. Few studies have already investigated the mechanical behavior of free-standing nanoparticles at room temperature.
In the present work, we investigate both free-standing and matrix-embedded nanoparticle behavior thanks to molecular dynamics simulations. Uniaxial compressions are performed on 20nm-sized nanoparticles after relaxation/thermalization. The impact of the force field model is first studied in order to discuss the modelling representativeness of mechanical testing in molecular dynamics.
The Ni3Al nanoparticle mechanical behavior is then investigated through a large spectrum of temperatures. The plastic deformation mechanisms are analyzed in details both for free-standing and Ni matrix-embedded nanoparticles. The effect of nanoparticle shape, crystallographic orientation or temperature on plasticity mechanisms and yield stress are discussed. Particular attention is paid to the interface and the effect of the misfit. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, High-Temperature Materials, Mechanical Properties |