Recovery of deformation microstructure in the bulk interior revealed by synchrotron X-ray micro-diffraction

Tianbo Yu*, Chuanshi Hong, Yubin Zhang, Adam Lindkvist, Wenjun Liu, Jon Tischler, Dorte Juul Jensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A synchrotron X-ray micro-diffraction based technique, namely differential aperture X-ray microscopy (DAXM), is used to investigate the subgrain evolution in the bulk interior during ex-situ recovery annealing of a lightly deformed Al sample. This is the first 4D DAXM study of recovery. Supplementary TEM observations reveal that DAXM enables proper reconstruction of the microstructure, with the important addition that it is in 3D. The DAXM result provides a direct observation of the 3D microstructural evolution during annealing and confirms that subgrain boundary migration is an important mechanism for subgrain growth, preferentially removing small subgrains. Moreover, it gives new evidence of subgrain coalescence as an alternative mechanism for subgrain growth—some neighboring subgrains are observed to merge due to the decrease of the misorientation angle across certain subgrain boundaries. A possible interaction of the two recovery mechanisms is discussed, as well as the advantage and limitation of the DAXM technique for recovery studies.
Original languageEnglish
Article number112997
JournalMaterials Characterization
Volume202
Number of pages11
ISSN1044-5803
DOIs
Publication statusPublished - 2023

Keywords

  • Boundary migration
  • Microstructure
  • Recovery
  • Subgrain coalescence
  • Synchrotron diffraction

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