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NiTiPt shape memory alloy: microstructure and transformation behaviour

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Abstract

In this article, microstructural evolution in an NiTiPt high-temperature shape memory alloy during processing and its effect on transformation behaviour have been reported. Cast NiTiPt alloy revealed an inhomogeneous microstructure, wherein the interdendritic regions were rich in Ti and Ni, and depleted in Pt compared to the dendritic regions. Inhomogeneity in the microstructure resulted in an alloy with a wide transformation width (Ms–Mf or Af–As) of about 160 °C. Homogenization of the cast alloy at 1050 °C resulted in complete dissolution of dendrites in the microstructure and reduction in the phase transformation width to 35–40 °C. Further microstructural refinement in the homogenized alloy was achieved through hot working and a combination of cold working and annealing. The wrought alloy possessed an average grain size of about 10 μm and phase transformation width of 20–25 °C. TEM microstructure of cold drawn and shape memory annealed wire showed recrystallized microstructure with grain size of 200–300 nm and well-defined martensite twin variants.

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Acknowledgements

The authors acknowledge the financial support from the Defence Research and Development Organisation, National Programme on Micro and Smart Systems (NPMaSS, PARC#1:3), Aeronautical Development Agency (ADA), Bangalore, India for carrying out the work presented in this paper.

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  1. Materials Science Division, CSIR-National Aerospace Laboratories, Bangalore, 560 017, India

    K. V. Ramaiah, C. N. Saikrishna, M. Sujata, M. Madan & S. K. Bhaumik

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  1. K. V. Ramaiah
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  2. C. N. Saikrishna
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  3. M. Sujata
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  5. S. K. Bhaumik
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Correspondence to K. V. Ramaiah.

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Ramaiah, K.V., Saikrishna, C.N., Sujata, M. et al. NiTiPt shape memory alloy: microstructure and transformation behaviour. ISSS J Micro Smart Syst 8, 81–88 (2019). https://doi.org/10.1007/s41683-019-00039-9

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  • DOI: https://doi.org/10.1007/s41683-019-00039-9

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