Effect of grain size on superplastic behavior of 5083 Al

D. H. Bae, A. K. Ghosh

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)


To understand the effect of grain size on superplastic deformation behavior, stress-strain rate relationship of an Al-Mg alloy has been characterized by conducting an improved multi-step strain rate change test method to preserve near isostructural conditions during the test over the temperature range of 450-550 °C. The grain size of the alloy was varied in the range of 8-30 μm by varying thermomechanical processing conditions. A sigmoidal relationship between stress and strain rate is observed unequivocally in each case, which is therefore not a result of concurrent grain growth. Grain size exponent (p) is found as 0.37 in high strain rate region based on a semi-empirical creep equation. This small grain size dependence has not been clearly identified in the literature. In low and intermediate strain rate region, using an effective stress versus and strain rate relationship, p is found as 2.07. This result is found to provide good agreement with the model of grain boundary sliding accommodated by the climb of dislocations.

Original languageEnglish
Number of pages10
Publication statusPublished - 1998
EventProceedings of the 1998 TMS Annual Meeting - San Antonio, TX, USA
Duration: 1998 Feb 151998 Feb 19


OtherProceedings of the 1998 TMS Annual Meeting
CitySan Antonio, TX, USA

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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