Abstract
The present work explores the phase transition characteristics of a shape memory alloy (SMA), Ni50.7Ti49.3 (at.%), studied under three different types of partial thermal cycling, namely M⇌M + A (Type I), A ⇌ A + M (Type II) and M + A ⇌ M + A (Type III), based on the temperature range and the phases involved during the phase transformation. The partial thermal cycling tests were conducted using a differential scanning calorimeter (DSC) by varying the maximum and minimum temperatures of a cycle, while the presence of phases at different temperatures was confirmed by XRD analysis. It is observed that Type I partial cycling suppresses the appearance of the intermediate R phase during thermal cycling. Also, during Type II and Type III partial cycling, the phase changes take place in two steps, i.e., R phase to B2 (first stage) and B19’ to B2 (second stage). The area under the transformation curve corresponding to the first stage enlarges with increasing cycles, while that corresponding to the second stage decreases with them. All this is because of the change in the volume fraction of the alloy taking part during the phase changes and the generation of dislocation during thermal cycling. Partial cycling results in a higher stability of phase transition temperatures as compared to that for full cycling.
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The raw data that support the findings of this study are available in one of the author's research gate profiles (controlled access repository). https://www.researchgate.net/publication/359392939_Raw_data_for_Partial_Cycling_of_NiTi_SMA.
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Acknowledgments
The authors gratefully acknowledge the financial support from the Science and Engineering Research Board, Department of Science and Technology, India, under grant number CRG/2019/002267. The authors would also like to acknowledge the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI—Hyderabad) for allowing us to conduct the high-temperature XRD tests.
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Ganesan, S., Vedamanickam, S. Transformation Behavior of a Shape Memory Ni50.7Ti49.3 (at.%) Alloy during Partial Thermal Cycling. J. of Materi Eng and Perform 32, 2501–2508 (2023). https://doi.org/10.1007/s11665-022-07284-4
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DOI: https://doi.org/10.1007/s11665-022-07284-4