Developing superplasticity in a magnesium alloy through a combination of extrusion and ECAP

K. Matsubara, Y. Miyahara, Z. Horita, T. G. Langdon

    Research output: Contribution to journalArticlepeer-review

    352 Citations (Scopus)

    Abstract

    A new processing procedure was applied to a cast Mg-9% Al alloy. This procedure involves the sequential application of extrusion and equal-channel angular pressing and is designated EX-ECAP. Experiments show that the Mg-9% Al alloy has an initial grain size of ∼50 μm after casting but this is reduced to ∼12 μm after extrusion and it is further reduced to ∼0.7 μm when the extruded alloy is subjected to ECAP for 2 passes at 473 K. Although the cast alloy exhibits extremely limited ductility and the extruded alloy is only moderately ductile, it is demonstrated that processing by EX-ECAP produces excellent superplastic ductilities including the occurrence of both low temperature superplasticity and high strain rate superplasticity. The EX-ECAP process is less effective when the ECAP step is conducted at 573 K because, although the pressing is then very easy, there is significant grain growth at this higher temperature.

    Original languageEnglish
    Pages (from-to)3073-3084
    Number of pages12
    JournalActa Materialia
    Volume51
    Issue number11
    DOIs
    Publication statusPublished - Jun 27 2003

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

    Fingerprint

    Dive into the research topics of 'Developing superplasticity in a magnesium alloy through a combination of extrusion and ECAP'. Together they form a unique fingerprint.

    Cite this