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

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

    研究成果: ジャーナルへの寄稿学術誌査読

    368 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)3073-3084
    ページ数12
    ジャーナルActa Materialia
    51
    11
    DOI
    出版ステータス出版済み - 6月 27 2003

    !!!All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • セラミックおよび複合材料
    • ポリマーおよびプラスチック
    • 金属および合金

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