Exceptional superplasticity in an AZ61 magnesium alloy processed by extrusion and ECAP

Miyahara, Y., Horita, Z. and Langdon, T.G. (2006) Exceptional superplasticity in an AZ61 magnesium alloy processed by extrusion and ECAP. Materials Science and Engineering: A, 420 (1-2), 240-244. (doi:10.1016/j.msea.2006.01.043).

Record type: Article

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 ?m 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.

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