Abstract
Friction stirs processing of a rolled AZ31 alloy, and a high pressure die cast AZ91 alloy produced ultrafine grained materials with average grain size of 0.8μm and 0.5μm, respectively. Tensile testing was done in the temperature range of 210-360°C and strain rate range of 1x10-4-3x10-2s-1. Higher amounts of Β-precipitates in AZ91 thermally stabilized the microstructure up to 330°C. Friction processed ultrafine grain AZ91 exhibited high strain rate super plasticity at all tested temperatures. The best elongation of 1251% was achieved at a strain rate of 1x10-2s-1 and temperature of 330°C. The kinetic analysis of the superplastic data revealed a large variation in the kinetic parameter due to difficulty in using proper grain size values because of concurrent grain growth. © 2012 Elsevier B.V.
Recommended Citation
A. Mohan et al., "High Strain Rate Superplasticity in Friction Stir Processed Ultrafine Grained Mg-Al-Zn Alloys," Materials Science and Engineering: A, vol. 562, pp. 69 - 76, Elsevier, Feb 2013.
The definitive version is available at https://doi.org/10.1016/j.msea.2012.11.026
Department(s)
Materials Science and Engineering
Keywords and Phrases
Grain growth; Grain refinement; Magnesium alloys; Superplasticity
International Standard Serial Number (ISSN)
0921-5093
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Feb 2013
