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 x 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 x 10-4 s-1 and 490 °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.
I. Charit and R. S. Mishra, "Evaluation of Microstructure and Superplasticity in Friction Stir Processed 5083 Al Alloy," Journal of Materials Research, Materials Research Society, Jan 2004.
The definitive version is available at http://dx.doi.org/10.1557/JMR.2004.0429
Materials Science and Engineering
National Science Foundation (U.S.)
United States. Department of Energy
Keywords and Phrases
Fine-Grained Microstructures; Friction Stir Processing; Tensile Tests
Article - Journal
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