Determination of the non-chemical free energy terms in martensitic transformations

L. Daróczi, Z. Palánki, D. L. Beke

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In former papers we proposed a method for the determination of the volume derivatives of dissipative and elastic free energy contributions at the start and finish temperatures of the martensitic transformation. This analysis can be extended and from the normalized hysteresis loops the non-chemical free energies can be calculated at different transformed fractions. The self-consistency of the extended analysis is illustrated on the basis of hysteresis and differential scanning calorimetry measurements in polycrystalline Cu-Al-Ni shape memory alloys. In single-crystalline samples of the same alloy, the equilibrium transformation temperature has also been determined as the function of the uniaxial stress, which can make the above analysis complete and allows the determination of the absolute values of the elastic energy contributions as well.

Original languageEnglish
Pages (from-to)80-84
Number of pages5
JournalMaterials Science and Engineering A
Volume438-440
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Nov 25 2006

Keywords

  • Cu-Al-Ni
  • Equilibrium transformation temperature
  • Non-chemical free energy
  • Shape memory alloy
  • Transformed fraction

ASJC Scopus subject areas

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

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