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 journalArticle

338 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

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