Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 562, Issue -, Pages 69-76Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.11.026
Keywords
Magnesium alloys; Superplasticity; Grain refinement; Grain growth
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Friction stir processing of a rolled AZ31 alloy and a high pressure die cast AZ91 alloy produced ultrafine grained materials with average grain size of 0.8 mu m and 0.5 mu m, respectively. Tensile testing was done in the temperature range of 210-360 degrees C and strain rate range of 1 x 10(-4)-3 x 10(-2) s(-1). Higher amounts of beta-precipitates in AZ91 thermally stabilized the microstructure up to 330 degrees C. Friction processed ultrafine grain AZ91 exhibited high strain rate superplasticity at all tested temperatures. The best elongation of 1251% was achieved at a strain rate of 1 x 10(-2) s(-1) and temperature of 330 degrees 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. (C) 2012 Elsevier B.V. All rights reserved.
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