About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Heterostructured and Gradient Materials (HGM IV): Tailoring Heterogeneity for Superior Properties
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Presentation Title |
Mechanical Properties and Structural Stability of a Bulk Nanostructured Metastable Aluminum-magnesium |
Author(s) |
Megumi Kawasaki |
On-Site Speaker (Planned) |
Megumi Kawasaki |
Abstract Scope |
Separate metal disks of Al and Mg were mechanically bonded through high-pressure torsion (HPT) processing for equivalent strain of >2,000 under a compressive pressure of 6.0 GPa. Such high straining through the HPT processing synthesized a bulk nanostructured metastable Al with grain sizes of 35-40 nm in a state of supersaturated solid solution with the measured maximum Mg solubility of ~38.5 at.% via formation of Al-Mg intermetallic phases. The sample demonstrated uniaxial flow stresses of 1.3-1.5 GPa with an excellent plasticity by achieving high strain rate sensitivity of 0.036. An X-ray diffraction analysis estimated a high compositional microstrain of ~0.0202 due to the supersaturation of Mg in the Al matrix after processing. This increased to ~0.0274 after natural aging for 60 days due to the heterogeneous distribution of supersaturated Mg solutes without any nucleation of a second phase, thereby demonstrating a reasonable microstructural stability. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Phase Transformations |