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The effect of strain rate on the deformation mechanisms and the strain rate sensitivity of an ultra-fine-grained Al alloy

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
61
Issue
2
Identifiers
DOI: 10.1016/j.scriptamat.2009.03.032
Keywords
  • Al Alloy
  • Equal Channel Angular Pressing
  • Ultra-Fine-Grained Microstructure
  • Strain Rate Sensitivity

Abstract

An ultra-fine-grained Al alloy was subjected to compression tests at different strain rates. The strain rate sensitivity of the flow stress was estimated. A strong effect of the baseline strain rate on the mechanisms of plastic deformation was found. It is suggested that a decrease of strain rate results in activation of micro shear banding due to grain boundary sliding. A connection between the strain rate, strain rate sensitivity, and the prevalent deformation mechanism was established.

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