About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2026
|
| Presentation Title |
Microstructural Evolution and Hydrogen Storage Properties in Hyper-Eutectic Mg-xNi Alloys |
| Author(s) |
Young Min Kim, Byeong-Chan Suh, Won-Seok Ko, Hyung-Ki Park |
| On-Site Speaker (Planned) |
Young Min Kim |
| Abstract Scope |
Mg–Ni alloys can store > 5 wt% H2, yet powder oxidation and costly ball-milling impede scale-up. We instead cast Mg–Ni billets (0–30 at% Ni, plus Mg-20 Ni-X with Sn/Y/Gd/Ag/Zn/Nd) and lathe-machined them into ≈ 50 µm chips, eliminating nano-powder handling. SEM/XRD and 300–350 °C P–C–T tests show that only alloys ≥ 20 at% Ni form a continuous Mg2Ni network; Mg-20 Ni absorbs its theoretical 4.9 wt% H2 within 10 min at 350 °C. Micro-alloying with 0.8 at% Sn refines Mg2Ni to sub-micron spheres and cuts absorption to < 3 min with a 5 % capacity penalty. Hot extrusion spheroidizes Mg2Ni and slows kinetics. Chips must be machined just-in-time, yet pre-formed Mg-20 Ni hydrides endure 15 days of air exposure and recharge quickly. The cast-and-chip process therefore delivers the fastest reversible sorption reported for cast Mg–Ni alloys and offers a scalable, oxidation-tolerant path to solid hydrogen storage. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Solidification, Energy Conversion and Storage |