Abstract
Friction stir processing is a new thermo-mechanical processing technique that leads to a microstructure amenable for high strain rate superplasticity in commercial aluminum alloys. Friction stirring produces a combination of very fine grain size and high grain boundary misorientation angles. Preliminary results on a 7075 Al demonstrate high strain rate superplasticity in the temperature range of 430-510 °C. For example, an elongation of >1000 % was observed at 490 °C and 1 × 10 -2 s -1 . This demonstrates a new possibility to economically obtain a superplastic microstructure in commercial aluminum alloys. Based on these results, a three-step manufacturing process to fabricate complex shaped components can be envisaged: cast sheet or hot-pressed powder metallurgy sheet + friction stir processing + superplastic forging or forming.
Keywords
SuperplasticityMaterials scienceFriction stir processingMetallurgyStrain rateGrain sizeStrain (injury)Microstructure
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Publication Info
- Year
- 2001
- Type
- article
- Volume
- 357-359
- Pages
- 507-514
- Citations
- 283
- Access
- Closed
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Cite This
Rajiv S. Mishra,
Murray W. Mahoney
(2001).
Friction Stir Processing: A New Grain Refinement Technique to Achieve High Strain Rate Superplasticity in Commercial Alloys.
Materials science forum
, 357-359
, 507-514.
https://doi.org/10.4028/www.scientific.net/msf.357-359.507
Identifiers
- DOI
- 10.4028/www.scientific.net/msf.357-359.507