Microstructural change of ultrafine-grained aluminum during high-speed plastic deformation

N. Tsuji, T. Toyoda, Y. Minamino, Y. Koizumi, T. Yamane, M. Komatsu, M. Kiritani

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

Effect of strain rate on microstructural change in deformation of the ultrafine grained (UFG) aluminum produced by severe plastic deformation (SPD) was studied. Commercial purity 1100 aluminum sheets were highly strained up to an equivalent strain of 4.8 by the Accumulative Roll-Bonding (ARB) process at ambient temperature. The ARB-processed sheets were found to be filled with pancake-shaped ultrafine grains surrounded by high-angle grain boundaries. The ultrafine grains had a mean grain thickness of 200 nm and a mean grain length of 1100 nm. The ultrafine-grained aluminum sheets were deformed at various strain rates ranging from 2 to 6.0 x 104 s-1 by conventional rolling, ultra-high-speed rolling, and impact compression. High-speed plastic deformation generates a large amount of heat, inducing coarsening of the ultrafine grains during and after deformation. On the other hand, it was also suggested that high-speed plastic deformation is effective for grain-subdivision, in other words, ultra-grain refinement, if the effect of heat generation is extracted.

Original languageEnglish
Pages (from-to)108-116
Number of pages9
JournalMaterials Science and Engineering A
Volume350
Issue number1-2
DOIs
Publication statusPublished - 2003 Jun 15

Keywords

  • Grain growth
  • Grain subdivision
  • Heat generation
  • Impact compression
  • Rolling
  • Severe plastic deformation
  • Ultra-high-speed plastic deformation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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