Strain-dependent phase transformation mapping of diffusion-bonded nanocrystalline aluminum-magnesium by high-energy synchrotron X-rays

Jae-Kyung Han, Kunihisa Sugimoto, Megumi Kawasaki*, Klaus-Dieter Liss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
JournalMaterials Letters
DOIs
StateE-pub ahead of print - 6 May 2022

Keywords

  • Aluminum alloy
  • Heterostructure
  • High-energy X-rays
  • High-pressure torsion
  • Phase transformation

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