| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advancements in Lightweight Composites, Materials & Alloys
|
| Presentation Title |
Core-Shell Dispersoids of Re-Aged Al-6Cu-0.5Mn-2Ni Alloy at 300°C: An Understanding of Their High-Temperature Stability |
| Author(s) |
Diya Mukherjee, Himadri Roy, Manidipto Mukherjee, Nilrudra Mandal, 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 200°C, the developed alloy retains 75% of its strength compared to peak aging conditions at 250°C by increasing T-phase re-precipitation. This approach could broaden the use of lightweight, high-temperature structural materials. |