Abstract
Multiple-step martensitic transformations of an aged Ni51Ti49 single crystal using calorimetric method were investigated. Results show that for short aging times (10–45 min) multiple-step martensitic transformations on cooling occur in two steps. Applying intermediate aging times (1.25–4 h) results in three steps and long aging times (more than 8 h) lead to two-step martensitic transformations again. This behavior has not been recognized in NiTi single crystals in literatures. It can be related to the heterogeneity of composition and stress fields around Ni4Ti3 precipitates.
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Acknowledgements
Jafar Khalil-Allafi thanks Professor Gunther Eggeler, Dr. Christoph Somsen and Dr. Andreas Kroeger from Ruhr University Bochum, Germany for assistance (supply of the NiTi single crystal, TEM investigations).
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Khalil-Allafi, J., Amin-Ahmadi, B. Multiple-step martensitic transformations in the Ni51Ti49 single crystal. J Mater Sci 45, 6440–6445 (2010). https://doi.org/10.1007/s10853-010-4729-4
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DOI: https://doi.org/10.1007/s10853-010-4729-4