Superelasticity at low temperatures in Cu-17Al-15Mn (at%) shape memory alloy

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Abstract

Superelasticity at temperatures between 77K and 273K in Cu-17Al-15Mn alloy was investigated. In this alloy, where no thermallyinduced martensitic transformation appears, an excellent superelasticity with recovery strain of 8.5% was confirmed at 77 K. The critical stresses for stress-induced martensitic transformation decrease with decreasing temperature and its gradient becomes smaller at low temperatures due to the decrease of entropy change. The entropy change estimated at 77K is -0.46 J/(mol·K), which is almost one-third of that at 221 K.

Original languageEnglish
Pages (from-to)1713-1715
Number of pages3
JournalMaterials Transactions
Volume52
Issue number8
DOIs
Publication statusPublished - 2011

Keywords

  • Copper alloys
  • Heusler phases
  • Martensitic phase transformation
  • Shape memory alloy
  • Superelasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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