Journal
SCRIPTA MATERIALIA
Volume 100, Issue -, Pages 59-62Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.12.013
Keywords
NiTi; Shape memory alloys (SMAs); Martensitic phase transformation; X-ray diffraction (XRD); Fatigue
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The effect of cyclic tensile loading on the transformation behavior of superelastic NiTi was investigated by in-situ synchrotron X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was quantitatively demonstrated that cyclic tensile loading alters the reversible austenite martensite transformation character from localized (transformation fronts propagating) to uniform. TEM and XRD showed that the change of transformation behavior is not related to the presence of retained martensite or a change in texture upon tensile load-cycling but to the introduction of dislocations. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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