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

38 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

Fingerprint

superplasticity
Superplasticity
Grain refinement
Torsional stress
strain rate
torsion
Strain rate
grain boundaries
Superplastic deformation
Grain boundary sliding
elongation
sliding
Elongation
Grain boundaries
Activation energy
grain size
activation energy
evaluation
Processing

All Science Journal Classification (ASJC) codes

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

Cite this

Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion. / Alhamidi, Ali; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 622, 02.01.2015, p. 139-145.

Research output: Contribution to journalArticle

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