About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Forming and Joining of Advanced Sheet Metal Materials
|
| Presentation Title |
Synergistic role of high-entropy alloy interlayer and post-weld heat treatment in suppressing intermetallic compounds and enhancing joint strength in friction stir welding of Al-Fe alloys |
| Author(s) |
Seonghoon Yoo, Yoona Lee, Byungwook Choi, Wookjin Lee, Yoonsuk Choi, Namhyun Kang |
| On-Site Speaker (Planned) |
Seonghoon Yoo |
| Abstract Scope |
Dissimilar joining of Al alloys with other metals enables weight reduction in structural materials. However, differences in chemical and physical properties cause brittle intermetallic compound (IMC) formation at the dissimilar joints. IMCs can provide crack initiation sites and propagation paths, degrading structural performance and reliability. Friction stir welding (FSW) allows control of IMC thickness through low heat input. Despite its advantages, further study is required to suppress IMC formation or minimize its thickness to nanoscale.
This study presents a thermodynamically designed high-entropy alloy (HEA) interlayer at interface in FSW joints of Al–Fe alloys, preventing interfacial fractures induced by IMCs. The HEA interlayer effectively controlled IMC thickness and characteristics, thus avoiding interfacial fracture. Additionally, high joint strength was achieved by restoring the thermally degraded mechanical properties of Al through post-weld heat treatment (PWHT). This synergistic strategy combining HEA interlayer and PWHT enables reliable dissimilar joining for high-performance, lightweight structures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Joining, Mechanical Properties |