About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Lightweight Alloy Matrix Composites
|
| Presentation Title |
Microstructural Evolution and Mechanical Properties of Co-Modified Alsi10mg Alloy Fabricated Via In-Situ Alloying in Laser Powder Bed Fusion |
| Author(s) |
Xiaopeng Li |
| On-Site Speaker (Planned) |
Xiaopeng Li |
| Abstract Scope |
To enhance the lightweight potential of structural components via laser powder bed fusion (LPBF), this study introduced 3 wt.% Co into AlSi10Mg through in-situ alloying. Microstructural evolution and mechanical properties were examined under routine and remelting scan strategies, as well as after heat treatment. In the as-built state, residual Co particles induced heterogeneity and promoted the formation of Al9Co2, which enhanced tensile strength to 380–423 MPa. Al9Co2 appeared in cellular and vortex-like morphologies within melt pools. Nano-stacking faults and Si-rich precipitates formed along melt pool boundaries but disappeared after heat treatment, which transformed Si and Al9Co2 into granular phases. Heat treatment improved ductility to 9–10% but reduced tensile strength to 245–249 MPa. Residual Co particles remained stress concentrators, limiting ductility. No strong orientation relationship was observed between the Si or Al9Co2 phases and the Al matrix in either condition. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Composites |