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Microstructure and texture evolution in the tension of superplastic Al–6Cu–0.4Zr

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
53
Issue
10
Identifiers
DOI: 10.1016/j.actamat.2005.03.019
Keywords
  • Superplasticity
  • Texture
  • Grain Growth
  • Aluminium

Abstract

Abstract The effect of tension at 450 °C with a strain rate of 10 −3 s −1 on the microstructure and texture of a superplastic Al–6Cu–0.4Zr alloy has been investigated. The strain rate sensitivity index was essentially constant with strain, and therefore microstructure, at m ≈ 0.45. The texture was dominated by a component centred on {0 1 1}〈√2 1 1〉, which became weaker with deformation. The two variants of that texture allowed the identification of bands in the microstructure which acted as internal markers, and persisted to high strain. The texture and microstructure changes are not consistent with relative grain translation via boundary sliding, and a combination of rate-sensitive slip and dynamic grain growth is a better candidate to explain the behaviour of this material.

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