| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Synthesis of an Ultrafine-grained Metastable Al Alloy through Mechanical Bonding by High-pressure Torsion |
| Author(s) |
Megumi Kawasaki, Jae-Kyung Han, Terence G. Langdon |
| On-Site Speaker (Planned) |
Megumi Kawasaki |
| Abstract Scope |
Processing by high-pressure torsion (HPT), which was developed initially as a grain refinement technique, was extended recently to the mechanical bonding of dissimilar metals. In this study, separate disks of Al and Mg were mechanically bonded by HPT up to 100 turns at 6.0 GPa. A series of experiments revealed that such high straining through HPT processing introduced an ultrafine-grained metastable Al alloy with grain sizes of ~35-40 nm in a state of supersaturated solid solution with a maximum Mg solubility of ~38.5 at.%. A superhard Al solid solution with a maximum Vickers microhardness value of ~370 was observed consistently across the disk diameter. Our results demonstrate the synthesis of a bulk nanocrystalline metastable alloy with good microstructural stability at room temperature where such bulk solids are not yet reported for mechanical alloying by powder metallurgy. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |