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Stability in Phase Transformation After Multiple Steps of Marforming in Ti-Rich Ni-Ti Shape Memory Alloy

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Abstract

Nickel-titanium (Ni-Ti) alloys are the most attractive among shape memory alloys (SMA) due to their good functionality properties coupled with high strength and ductility. The transformation temperatures in Ti-rich Ni-Ti SMA can be altered by subjecting them to suitable thermal and/or mechanical treatments to obtain martensitic transformation in one or more steps above 0 °C. The goal of the present work is to investigate the stability of phase transformation characteristics, such as, type of sequence (one, two, and multiple steps) and transformation temperatures in Ti-Rich Ni-Ti SMA (Ni-51 at.%Ti), after being subjected to an initial heat treatment at 500 °C for 30 min in air followed by multiple steps of marforming (cold rolling, 30% thickness reduction) intercalated with heat treatments at 500 °C for 30 min in air and a final heat treatment at four different temperatures (400, 450, 500, and 600 °C) for 30 min in air atmosphere. Differential scanning calorimetry (DSC) and electrical resistivity (ER) were used to identify the phase transformation sequences and the stability of transformation temperatures during initial 10 thermal cycles for each sample with distinct thermo-mechanical treatment.

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Acknowledgments

The authors acknowledge FCT/MCTES for the pluriannual financial support of CENIMAT/I3N and the project Smart Composites (PTDC/CTM/66380/2006). KKM gratefully acknowledges the fellowship with Ref. No. C2007-443-CENIMAT-6/Ciência2007. ASP gratefully acknowledges FAPERJ (Brazil) for the financial support in the APQ-1 project E-26/110.414/2010.

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Authors and Affiliations

  1. PPGEM - Post-graduated Program in Metallurgical Engineering, UFF - Universidade Federal Fluminense, Volta Redonda, RJ, Brazil

    Andersan dos Santos Paula

  2. FCT/UNL, CENIMAT-I3N, Campus de Caparica, 2829-516, Caparica, Portugal

    Karimbi Koosappa Mahesh & Francisco Manuel Braz Fernandes

Authors
  1. Andersan dos Santos Paula
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  2. Karimbi Koosappa Mahesh
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  3. Francisco Manuel Braz Fernandes
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Correspondence to Andersan dos Santos Paula.

Additional information

This article is an invited paper selected from presentations at Shape Memory and Superelastic Technologies 2010, held May 16-20, 2010, in Pacific Grove, California, and has been expanded from the original presentation.

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dos Santos Paula, A., Mahesh, K.K. & Braz Fernandes, F.M. Stability in Phase Transformation After Multiple Steps of Marforming in Ti-Rich Ni-Ti Shape Memory Alloy. J. of Materi Eng and Perform 20, 771–775 (2011). https://doi.org/10.1007/s11665-011-9920-5

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  • DOI: https://doi.org/10.1007/s11665-011-9920-5

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