| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Alloys: Development and Manufacturing
|
| Presentation Title |
Microstructure and Elevated Temperature Mechanical Properties of a Novel Heat-Resistant Al-6Cu-0.5Mn-2Ni-X Alloy |
| Author(s) |
Diya Mukherjee, Himadri Roy, Manidipto Mukherjee, Dong Qiu, Mark A Easton |
| On-Site Speaker (Planned) |
Diya Mukherjee |
| Abstract Scope |
Heat-resistant aluminum alloys are crucial in aerospace and automotive industries but commercial Al alloys lose their strength at higher
temperatures due to rapid precipitate coarsening. Specifically, θ?-Al2Cu precipitates in Al-Cu alloys coarsen above 250°C into low-aspect ratio θ precipitates. The current research aims to enhance thermal stability by adding Mn, Ni, Sc, Zr, and Ti, creating T-Al20Cu2Mn3 and Al7Cu4Ni phases and Al3(Sc, Zr, Ti) core-shell dispersoids. These additions promote fine θ? Precipitate formation and inhibit coarsening, maintaining high ultimate tensile strength 216 MPa with 8.8% ductility at 300°C. Atomic-scale characterization reveals solute segregation at grain boundaries and dispersoids being crucial for stabilizing interfaces. After 100h of thermal exposure at 200oC, the developed alloy retains 75% of its strength compared to peak aging conditions at 250oC by increasing T-phase re-precipitation. This approach could broaden the use of lightweight, high-temperature structural materials. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Characterization, Solidification |