About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Microstructure and High-temperature Mechanical Properties of a Novel Al-Ni-Fe-Zr Alloy Processed by Laser Powder Bed Fusion |
Author(s) |
Joshua P. Dorn, Hyeji Park, Joseph R. Croteau, Nhon Q. Vo, David C. Dunand |
On-Site Speaker (Planned) |
Joshua P. Dorn |
Abstract Scope |
The microstructural evolution of a novel, near-eutectic Al-Ni-Fe-Zr alloy, processed by laser powder-bed fusion (LPBF) and subsequently heat-treated, is investigated. A highly heterogeneous grain structure is observed, consisting of micron-sized cellular equiaxed grains at melt pool boundaries and coarser eutectic columnar grains in the melt pool interiors. After heat treatment in a range of 250 to 350 °C, the interconnected fine Al9FeNi eutectic phase, formed under rapid solidification conditions during LPBF processing, coarsens and fragments. High mechanical properties at both ambient and elevated temperatures are observed, as compared to a LPBF AlSi10Mg alloy. Compressive creep testing at 300°C shows that diffusional creep dominates at low stresses and dislocation creep at high stresses, with the presence of a threshold stress. Relationships between microstructure evolution and creep properties are discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, High-Temperature Materials, Additive Manufacturing |