About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Metal-Matrix Composites: Analysis, Modeling, Observations and Interpretations
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Presentation Title |
In-situ Synthesis of Al/Al2O3 Nanocomposites via Spark Plasma Sintering of Nano-sized Al Powders |
Author(s) |
Yaojun Lin, Zhigang Yan, Zhibo Liu, Fei Chen, Enrique J. Lavernia |
On-Site Speaker (Planned) |
Yaojun Lin |
Abstract Scope |
We report on our research efforts related to the in situ synthesis of Al/Al2O3 nanocomposites via spark plasma sintering (SPS) followed by plastic deformation, including either hot extrusion or high pressure torsion (HPT). Our results show that during SPS the oxide films on Al powder surfaces are disrupted into nano-scale oxide particles at grain boundaries (GBs) by strong pulsed electric discharge and the oxide particles effectively retarded nano-sized grain growth. Plastic deformation redistributes the nano-scale oxide particles at both GBs and grain interiors, but induces grain growth to an ultra-fine regime. Microstructures in as-SPS, extruded and HPT Al/Al2O3 nanocomposites are presented. The mechanical properties of Al/Al2O3 nanocomposites are measured via tensile testing. Our results show that plastic deformation can improve both strength and ductility of the Al/Al2O3 nanocomposites. Based on the results in the present work, we discuss the future directions to further enhance strength and ductility of Al/Al2O3 nanocomposites. |
Proceedings Inclusion? |
Planned: |