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Exceptional superplasticity in an AZ61 magnesium alloy processed by extrusion and ECAP |
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| Authors: | Yuichi Miyahara Zenji Horita Terence G. Langdon |
| Affiliation: | aDepartment of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan bDepartments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA |
| Abstract: | Experiments were conducted on a commercial AZ61 alloy to evaluate the potential for achieving an ultrafine grain size and superplastic ductilities through the use of the EX-ECAP two-step processing procedure of extrusion plus equal-channel angular pressing. The results show that EX-ECAP gives excellent grain refinement with grain sizes of 0.6 and 1.3 μm after pressing at 473 and 523 K, respectively. The alloy processed by EX-ECAP exhibits exceptional superplastic properties including a maximum elongation of 1320% after pressing through four passes when testing at 473 K with an initial strain rate of 3.3 × 10−4 s−1. This result compares with an elongation of 70% achieved in the extruded condition without ECAP under similar testing conditions. |
| Keywords: | Equal-channel angular pressing (ECAP) Magnesium alloy Strain rate sensitivity Superplasticity Ultrafine grains |
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