The influence of Ni 4Ti 3 precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy

In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni 4Ti 3 precipitates as a governing parameter in different aging temperatures and time as well as appli...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 485; no. 1; pp. 320 - 323
Main Authors Shakeri, M.S., Khalil-Allafi, J., Abbasi-Chianeh, V., Ghabchi, Arash
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2009
Subjects
Ni 4Ti 3 precipitates
NiTi
Shape memory
Thermomechanical cycles
TWSME
TWSME
Thermomechanical cycles
NiTi
Shape memory
Ni 4Ti 3 precipitates
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Summary:In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni 4Ti 3 precipitates as a governing parameter in different aging temperatures and time as well as applied strain on TWSME were studied. The results indicate that 450 °C is the optimum aging temperature to achieve highest recovery rate. The increasing of applied strain up to 3.38% and aging time up to 2.5 h at 450 °C improves the recovery rate. It has been concluded that formation of especial variants of Ni 4Ti 3 precipitates during aging and increasing of applied strain on thermomechanical cycling treatments could enhance the TWSME.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2009.05.084