About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Development in Light Weight Alloys and Composites
|
Presentation Title |
Designing Al-Cu Alloy to Improve the Mechanical Properties and Thermal Stability via Micro-alloying with Cr Solute |
Author(s) |
Gihoon Moon, Eunkyung Lee |
On-Site Speaker (Planned) |
Gihoon Moon |
Abstract Scope |
The refinement and thermal stability of metastable θ' precipitates are critical in the development of new high-performance Al-Cu alloys for elevated temperature applications. In this work, the micro-alloying influences of Cr on the aging behavior and thermal stability of Al-Cu alloy were systematically studied. The results showed that the addition of Cr can increase the strength during artificial aging and effectively improved the thermal stability of θ’ during prolonged thermal exposure. This is because the enhanced precipitation kinetic and microstructural stabilization arise from the segregation mechanism of Cr at the Al/ θ' semi-coherent interfaces. Especially, the Cr-segregation at the interface is essential to improve the coarsening resistance of θ' by acting as a kinetic diffusion barrier. This study reveals how the micro-alloying of Cr solute can work in concert to a stabilization mechanism, and the results provide insights that can be contributed to the design of high-temperature alloy. |