About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
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Presentation Title |
L-49: Microstructures and Nanomechanical Behavior of Laser Processed Sr-modified Al-Si Eutectic |
Author(s) |
Arkajit Ghosh, Bibhu Prasad Sahu, Jian Wang, Amit Misra |
On-Site Speaker (Planned) |
Arkajit Ghosh |
Abstract Scope |
Laser surface remelting of Al-20Si and Al-20Si-0.2Sr (wt.%) alloys was used to produce nanoscale eutectics. Sr-modification was observed to increase the volume fraction of the fully eutectic morphology within the melt pool as compared to the unmodified alloy. A wide range of orientations of the eutectic nano fibers are prevalent and can be broadly classified as vertical and inclined eutectic morphologies with respect to the laser scan direction. Apart from the fully eutectic domains, presence of hypo-eutectic morphology was seen along the edge of the melt pool. Nanoindentation experiments indicate strong hardness and modulus gradients from the melt pool to as-cast region as well as within the melt pool between different eutectic orientations. HRTEM micrographs have been used to draw a comparison between deformation behaviors of the as-cast and different melt pool eutectics. Laser-refined heterostructured morphologies in eutectic alloys are shown to simultaneously improve flow strength and ductility. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, |