Journal
ACTA MATERIALIA
Volume 53, Issue 10, Pages 3059-3069Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2005.03.019
Keywords
superplasticity; texture; grain growth; aluminium
Funding
- Engineering and Physical Sciences Research Council [EP/D029201/1] Funding Source: researchfish
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The effect of tension at 450 degrees 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 approximate to 0.45. The texture was dominated by a component centred on {011} (root 211), 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. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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