About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPU-45: Nanoindentation Study of Laser-Glazed Supersaturated AlCo Alloys |
| Author(s) |
Reid T. Morrow, Seok-Woo Lee, Drew Cietek, Rainer Hebert |
| On-Site Speaker (Planned) |
Reid T. Morrow |
| Abstract Scope |
Small additions of alloying elements, such as cobalt or cerium, combined with ultra-fast cooling, can yield mechanical performance comparable to that of commercial aluminum alloys. In this study, Al-Co containing 0.5, 1.0, and 2.0 at% was arc-melted and subsequently laser-glazed to induce rapid cooling and to form a metastable FCC cobalt nanoprecipitates. Nanoindentation data near the surface, which is most rapidly cooled, showed a significant increase in hardness in the melt-pool region, approximately threefold for Al99.5Co0.5 and fourfold for Al99Co1 and Al98Co2 compared to the data of arc-melted samples. The hardness map reveals a gradual decrease in hardness from the surface toward the interior due to the difference in cooling rate. Rapid solidification extends cobalt solubility, forming localized nanoprecipitates of pseudomorphic FCC cobalt. These precipitates and refined grain structures impede dislocation motion, thereby increasing strength significantly. These findings establish an effective strategy for surface hardening in dilute aluminum alloys. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Mechanical Properties, Aluminum, Nanotechnology |