Subgrain dynamics during recovery of partly recrystallized aluminium

S. R. Ahl, H. Simons, C. Detlefs, D. Juul Jensen, H. F. Poulsen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The recovery dynamics of 498 individual subgrains within the non-recrystallized matrix of a 50% recrystallized aluminium sample is studied using high resolution X-ray diffraction at a synchrotron source. The subgrains’ change in size, orientation, axial strain and internal disorder are monitored as functions of temperature. The subgrains are surprisingly active, and the individual subgrains exhibit markedly different growth kinetics. Contradictory to common knowledge we find that the individual subgrains’ sizes change significantly even though the average size remain constant. Furthermore we observe no correlation between subgrain size and growth rate. An analysis of the volume changes of the individual subgrains indicates a broad spectrum of critical temperatures above which the subgrains grow or shrink. Possible mechanisms are discussed and related to relaxation of local stresses.
Original languageEnglish
JournalActa Materialia
Volume185
Pages (from-to)142-148
Number of pages7
ISSN1359-6454
DOIs
Publication statusPublished - 2020

Keywords

  • Rwecovery
  • Synchrotron
  • High-energy X-ray diffraction
  • Aluminium
  • Subgrain growth

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