Friction Stir Processing: A New Grain Refinement Technique to Achieve High Strain Rate Superplasticity in Commercial Alloys
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 1x10-2 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.
Recommended Citation
R. S. Mishra and M. W. Mahoney, "Friction Stir Processing: A New Grain Refinement Technique to Achieve High Strain Rate Superplasticity in Commercial Alloys," Materials Science Forum, vol. 357 thru 359, pp. 507 - 514, Trans Tech Publications, Jan 2001.
The definitive version is available at https://doi.org/10.4028/www.scientific.net/msf.357-359.507
Department(s)
Materials Science and Engineering
Keywords and Phrases
Aluminium alloys; Friction stir processing; Grain misorientation; Grain refinement; High strain rate superplasticity
International Standard Serial Number (ISSN)
1662-9752; 0255-5476
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Trans Tech Publications, All rights reserved.
Publication Date
01 Jan 2001
