Abstract
This study highlights the capability of high-energy synchrotron X-rays to investigate polymorphous phase transformation upon nanostructuring and diffusion bonding of Al and Mg through high-pressure torsion. 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 nanocrystalline alloy. The diffraction peaks involve apparent grain refinement broadening and compositional broadening with increasing shear strain. 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 an Al supersaturated solid solution with the Mg concentration of ∼14-15 at.%.
Original language | English |
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Journal | Materials Letters |
DOIs | |
State | E-pub ahead of print - 6 May 2022 |
Keywords
- Aluminum alloy
- Heterostructure
- High-energy X-rays
- High-pressure torsion
- Phase transformation