About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
G-2: Deformation Mechanisms of Metal Matrix Nanocomposites: A Molecular Dynamics Study |
Author(s) |
Wenwu Xu, Md. Shahrier Hasan |
On-Site Speaker (Planned) |
Wenwu Xu |
Abstract Scope |
With nanoscale reinforcements resulting in high density of matrix/particle interfaces, Metal Matrix Nanocomposites (MMNC) behave differently as compared to their micro-composite counterparts. An atomistic understanding of fundamental deformation mechanisms is necessary to link the nanoreinforcers with the strengthening and fracture properties of the nanocomposite. Using Al-SiC nanocomposite as a model material, we conducted Molecular Dynamics simulations to investigate the deformation mechanism and defect evolution in the material by varying SiC particle size and particle volume fraction. We found that the deformation mechanism of Al-SiC MMNC is characterized into three subsequent mechanisms, which are: (I) defect free deformation driven by lattice distortion of the metal matrix, (II) dislocation-based deformation driven by dislocation nucleation and growth, and (III) failure-based deformation driven by interface separation and void growth. Our fundamental understanding of atomistic deformation mechanisms in the Al-SiC nanocomposite is expected to provide a basis for a more targeted design of advanced MMNCs. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties |