Microstructure dependent elastic modulus variation in NiTi shape memory alloy

•Modulus value of different phases in NiTi depend on corresponding grain orientations.•Modulus also depend on the stress state and the internal strain energy.•Higher modulus for martensite phase. Modulus variation of NiTi shape memory alloy has been investigated at microstructural level through nano...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 633; pp. 71 - 74
Main Authors Suresh, K.S., Lahiri, Debrupa, Agarwal, Arvind, Suwas, Satyam
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.06.2015
Subjects
Intermetallics
Mechanical properties
Microstructure
Phase transitions
Shape memory
Intermetallics
Mechanical properties
Microstructure
Phase transitions
Shape memory
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Summary:•Modulus value of different phases in NiTi depend on corresponding grain orientations.•Modulus also depend on the stress state and the internal strain energy.•Higher modulus for martensite phase. Modulus variation of NiTi shape memory alloy has been investigated at microstructural level through nano dynamical mechanical analysis and compared with bulk experimental measurements. The differences between the modulus values at the macro and micro level as well as within the micro level are discussed and the corresponding variations have been explained based on the crystal structure, orientation and misorientation. The experimental results confirm a higher modulus value for the martensite phase that is in agreement with the theoretical predictions.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.01.301