Hysteresis in NiTi alloys

H. Sehitoglu, R. Hamilton, H. J. Maier, Y. Chumlyakov

Research output: Contribution to journalConference article

21 Scopus citations

Abstract

Large changes in hysteresis are reported as a function of applied stress under thermal cycling experiments in NiTi single crystals. In the low Ni alloy the thermal hysteresis expanded with increasing stress while in the high Ni alloy the thermal hysteresis contracted with increasing stress. The results in both cases meet the limit obtained from Differential Scanning Calorimetry at zero stress. The changes are attributed to the relaxation of elastic stored energy which is primarily due to dislocations emanating at martensite/austenite interfaces. Modifications in thermodynamics formulation are proposed to account for the change in hysteresis via change in the elastic stored energy. Memory effects due to dislocation arrangements imposed under high stress thermal cycles on subsequent thermal hysteresis under low stresses were found to be significant, while variations in thermal hysteresis from cycle to cycle under constant stress are noted to be rather small.

Original languageEnglish (US)
Pages (from-to)3-10
Number of pages8
JournalJournal De Physique. IV : JP
Volume115
DOIs
StatePublished - Dec 1 2004
EventEUROMECH-MECAMAT'2003: 7th European Mechanics of Materials Conference on Adaptive Systems and Materials: Constitutive Materials and Hybrid Structures - Frejus, France
Duration: May 18 2003May 23 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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