About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Alloys: Development and Manufacturing
|
| Presentation Title |
Microstructure Evolution and Heat Resistance of an Al–Fe–Mg–Zr Eutectic Alloy Fabricated by Laser Powder Bed Fusion |
| Author(s) |
Feng Li, Bart Kooi, Yutao Pei |
| On-Site Speaker (Planned) |
Feng Li |
| Abstract Scope |
Conventional precipitation-hardened aluminum alloys experience severe mechanical degradation above 200 °C due to precipitate coarsening and dissolution. This study presents a novel Al-Fe-Mg-Zr eutectic alloy fabricated via laser powder bed fusion, achieving crack-free fabrication with 99.8% relative density, ultrafine grains, and a heterogeneous cellular-lamellar microstructure. Direct aging (400 °C/4 h) enhances yield strength (YS) to 376.1 MPa (72.6% increase) and ultimate tensile strength to 405.8 MPa (30.7% increase) compared to the as-printed condition. The strengthening mechanisms arise from grain boundary strengthening, precipitation strengthening via coherent L1<sub>2</sub>-Al<sub>3</sub>Zr nanoscale dispersoids, and load transfer through submicron-scale Al-Fe intermetallics. High-temperature tensile testing retains a YS of 124 MPa at 350 °C. After prolonged thermal exposure (400 °C/100 h), the alloy demonstrates excellent heat resistance due to the low coarsening rate of Al<sub>13</sub>Fe<sub>4</sub> (0.98 nm<sup>3</sup>/s) and sustained Al<sub>3</sub>Zr precipitates. This work advances developing high-strength and thermally stable Al alloys for high-performance applications. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Additive Manufacturing, Aluminum, Characterization |