Superplastic forming at high strain rates after severe plastic deformation

Z. Horita, M. Furukawa, M. Nemoto, A. J. Barnes, T. G. Langdon

Research output: Contribution to journalArticlepeer-review

299 Citations (Scopus)

Abstract

An Al-3% Mg-0.2% Sc alloy was fabricated by casting and subjected to severe plastic deformation through equal-channel angular pressing to a strain of approximately 8. The grain size after pressing was approximately 0.2 μm and increased to -1.1 μm when holding at 673 K for 10 min. Very high tensile elongations were recorded at 673 K with a maximum elongation of approximately 2280% when testing with an initial strain rate of 3.3×10-2 s-1. The strain rate sensitivity was measured as approximately 0.5 at strain rates in the vicinity of 10-2 s-1. Small disks were cut from the rods after pressing and these disks were successfully formed into domes at 673 K using a biaxial gas-pressure forming facility and forming times up to a maximum of 60 s. Measurements of the local thicknesses at selected points around the domes revealed reasonably uniform thinning which is consistent with the high strain rate sensitivity of this alloy.

Original languageEnglish
Pages (from-to)3633-3640
Number of pages8
JournalActa Materialia
Volume48
Issue number14
DOIs
Publication statusPublished - Sep 4 2000

All Science Journal Classification (ASJC) codes

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

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