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

Yuichi Miyahara, Zenji Horita, Terence G. Langdon

    Research output: Contribution to journalArticlepeer-review

    159 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)240-244
    Number of pages5
    JournalMaterials Science and Engineering: A
    Issue number1-2
    Publication statusPublished - Mar 25 2006

    All Science Journal Classification (ASJC) codes

    • General Materials Science
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering


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