An evaluation of the flow behavior during high strain rate superplasticity in an Al-Mg-Sc alloy |
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| Authors: | Shogo Komura Zenji Horita Minoru Furukawa Minoru Nemoto Terence G Langdon |
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| Affiliation: | (1) Present address: the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, 812-8581 Fukuoka, Japan;(2) the Department of Technology, Fukuoka University of Education, Fukuoka 811-4192 Munakata, Japan;(3) Sasebo National College of Technology, 857-1193 Sasebo, Japan;(4) the Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, 90089-1453 Los Angeles, CA |
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| Abstract: | An Al-3 pct Mg-0.2 pct Sc alloy was fabricated by casting and subjected to equal-channel angular pressing to reduce the grain
size to ∼0.2 μm. Very high tensile elongations were achieved in this alloy at temperatures over the range from 573 to 723 K, with elongations
up to >2000 pct at temperatures of 673 and 723 K and strain rates at and above 10−2 s−1. By contrast, samples of the same alloy subjected to cold rolling (CR) yielded elongations to failure of <400 pct at 673
K. An analysis of the experimental data for the equal-channel angular (ECA)-pressed samples shows consistency with conventional
superplasticity including an activation energy for superplastic flow which is within the range anticipated for grain boundary
diffusion in pure Al and interdiffusion in Al-Mg solid solution alloys. |
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