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Evaluation of microstructure and superplasticity in friction stir processed 5083 Al alloy

Published online by Cambridge University Press:  01 November 2004

I. Charit  and
R.S. Mishra
I. Charit
Affiliation:
Center for Friction Stir Processing and Department of Metallurgical Engineering,University of Missouri, Rolla, Missouri 65409
R.S. Mishra*
Affiliation:
Center for Friction Stir Processing and Department of Metallurgical Engineering,University of Missouri, Rolla, Missouri 65409
*
a) Address all correspondence to this author. e-mail: rsmishra@umr.edu
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Abstract

Friction stir processing (FSP) has been developed as a potential grain refinement technique. In the current study, a commercial 5083 Al alloy was friction stir processed with three combinations of FSP parameters. Fine-grained microstructures with average grain sizes of 3.5–8.5 μm were obtained. Tensile tests revealed that the maximum ductility of 590 was achieved at a strain rate of 3 × 10−3 s−1 and 530 °C in the 6.5-μm grain size FSP material, whereas for the material with 8.5-μm grain size, maximum ductility of 575 was achieved at a strain rate of 3 × 10−4 s−1 and490 °C. The deformation mechanisms for both the materials were grain boundary sliding (m ∼0.5) However, the 3.5-μm grain size material showed maximum ductility of 315 at 10−2 s−1 and 430 °C. The flow mechanism was solute-drag dislocation glide (m ∼0.33) This study indicated that establishing a processing window is crucial for obtaining optimized microstructure for optimum superplasticity.

Keywords

AlloyMicrostructureSuperplasticity

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Type
Articles
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Journal of Materials Research , Volume 19 , Issue 11 , November 2004 , pp. 3329 - 3342
Copyright
Copyright © Materials Research Society 2004

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