About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing: Advanced Characterization With Synchrotron, Neutron, and In Situ Laboratory-scale Techniques IV
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| Presentation Title |
Laser-powder bed fusion of 8xxx-series aluminum alloys containing Fe |
| Author(s) |
Shao-Pu Tsai, Ji-Yun Wang, Zhongji Sun, Ming-Hao Lee |
| On-Site Speaker (Planned) |
Shao-Pu Tsai |
| Abstract Scope |
Sustainable metallurgy is becoming more pivotal due to resource and energy depletion. In this context, 8xxx-series Al alloys were developed by means of laser-powder bed fusion （L-PBF）. The work leveraged rapid solidification in L-PBF and demonstrated that abundant, impurity-intolerant elements, iron — typically a detrimental contaminant in recycled aluminum — can be transformed into a beneficial alloying element. The addition of Mo and Si enables the formation of a metastable Al₁₂（Fe, Mo）₃Si phase, while Zr forms a stabilizing shell around precipitates, collectively yielding alloys with excellent thermal stability and microhardness retention up to 300 °C. In-situ heating transmission electron microscopy was used to directly observe the evolution of solidification cells （cellular structures） in these alloys. It reveals that these cellular features, containing nanometer-scale crystalline embryos within their boundaries, remain intact up to 300 °C; however, heating beyond 325 °C triggers rapid cell wall decomposition and coarsening of Al₁₂（Fe, Mo）₃Si precipitates. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Sustainability, Aluminum |