About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
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Presentation Title |
Strain-dependent Phase Transformation Mapping of Diffusion-bonded Nanocrystalline Aluminum-magnesium by High-energy Synchrotron X-rays |
Author(s) |
Megumi Kawasaki, Klaus-Dieter Liss |
On-Site Speaker (Planned) |
Megumi Kawasaki |
Abstract Scope |
Separate metal disks of Al and Mg were mechanically bonded through high-pressure torsion processing for a shear strain of >3,000 under 6.0 GPa compressive pressure. Such high straining through HPT processing synthesized a bulk nanostructured metastable Al alloy with grain sizes of 35-40 nm in a state of supersaturated solid solution with the maximum Mg solubility of ~38.5 at.% via formation of Al-Mg intermetallic phases. This study highlights the capability of high-energy synchrotron X-rays to investigate the polymorphous phase transformation towards the formation of the metastable Al-Mg alloy. The measurements providing diffraction peak profiles at a series of local positions over the sample volume allow mapping of gradual yet significant structural changes in the Al-Mg alloy. The results reveal strain-dependent transformations between f.c.c and h.c.p. phases with a sharp dissolution at strains of ~2500 and subsequent homogenization towards the formation of the metastable Al-Mg alloy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Characterization, Aluminum |