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Stress-induced phase transformations in thermally cycled superelastic NiTi alloys: in situ X-ray diffraction studies

Published online by Cambridge University Press:  09 March 2015

Efthymios Polatidis ,
Nikolay Zotov  and
Eric J. Mittemeijer
Efthymios Polatidis*
Affiliation:
Max Planck Institute for Intelligent Systems, Stuttgart 70569, Germany
Nikolay Zotov
Affiliation:
Max Planck Institute for Intelligent Systems, Stuttgart 70569, Germany
Eric J. Mittemeijer
Affiliation:
Max Planck Institute for Intelligent Systems, Stuttgart 70569, Germany University of Stuttgart, Institute for Material Science, Stuttgart 70569, Germany
*
a) Author to whom correspondence should be addressed. Electronic mail: e.polatidis@is.mpg.de
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Abstract

In situ laboratory-based and in situ synchrotron X-ray diffraction techniques were employed to study quantitatively the strain-induced austenite-to-martensite (A–M) transformation in thermally cycled (TC) superelastic NiTi alloys. The propagation of the A–M interfaces and the evolution of the microstructure were traced during uniaxial tensile loading. It was shown that the TC material exhibits localized transformation via the propagation of transformation bands. The amount of the martensite phase depends approximately linearly on the applied strain. Analysis of the broadening of the austenite diffraction lines indicates the presence of highly deformed austenite grains within the transformation bands. Analysis of the austenite diffraction-line shifts indicates that the overall lattice strain in the (retained) austenite in the transformation bands differs from that of the austenite in the adjacent untransformed regions.

Keywords

NiTiSMAin situ XRDmartensitic transformation
Type
Technical Articles
Information
Powder Diffraction , Volume 30 , Supplement S1 , June 2015 , pp. S76 - S82
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Copyright
Copyright © International Centre for Diffraction Data 2015 

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