Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion

Ali Alhamidi, Zenji Horita

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

An Al-2024 alloy was processed by high-pressure torsion (HPT) to produce an ultrafine-grained structure with a grain size of ~240 nm. A maximum elongation of ~750% was attained with an initial strain rate of 1 × 10-2s-1 at 673 K, demonstrating the advent of high strain rate superplasticity through grain refinement by the HPT processing. Evaluation of the strain-rate sensitivity and the activation energy for the deformation confirmed that grain boundary sliding through grain boundary diffusion is the rate-controlling process for the superplastic deformation of the HPT-processed Al-2024 alloy.

Original languageEnglish
Pages (from-to)139-145
Number of pages7
JournalMaterials Science and Engineering A
Volume622
DOIs
Publication statusPublished - Jan 2 2015

All Science Journal Classification (ASJC) codes

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

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