Superplastic compressive flow in MgB2

John D. DeFouw*, David C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Macroplasticity in the brittle, superconducting ceramic MgB2 would allow for the mechanical drawing of thin, dense superconducting wires, as done for metallic superconductors. Here, we report very large uniaxial compressive deformation (engineering strain of 67% or true strain of -1.1) without fracture at 1000 °C for specimens densified from commercially available MgB2 powders with MgO and MgB4 second phases. Plastic flow occurs under a diffusion-controlled mechanism with activation energies of 255-447 kJ mol-1 and stress exponents of 1.4-2.0, indicative of superplastic behavior.

Original languageEnglish (US)
Pages (from-to)4745-4750
Number of pages6
JournalActa Materialia
Volume57
Issue number16
DOIs
StatePublished - Sep 1 2009

Keywords

  • Creep
  • Magnesium diboride
  • Superconductors
  • Superplastic forming
  • Superplasticity

ASJC Scopus subject areas

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

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