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Martensite Strain Memory in the Shape Memory Alloy Nickel-Titanium Under Mechanical Cycling

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Abstract

This paper describes an experimental study of stress-induced martensitic phase transformation in the SMA Nickel-Titanium. The rich local thermo-mechanical interactions that underlie transformation are examined using three-dimensional Digital Image Correlation (strain fields) and infrared imaging (thermal fields). We quantify the complex local interactions between released/absorbed latent heat and the extent of transformation, and explore the characteristics of the phase fronts and the evolution of martensitic volume fraction. We also quantify a strong strain memory in the martensite that forms in the wake of the phase transformation front. The accommodated strain in the martensite will remain constant during loading, even as the existing phase front propagates. There also exists a remarkable strain memory in the martensite that persists from cycle to cycle, indicating that the local elastic stress fields in the martensite are driven by a dislocation structure and martensitic nuclei that largely stabilize during the first loading cycle.

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Acknowledgements

The authors gratefully acknowledge the financial support of the US Department of Energy, Office of Basic Energy Sciences (contract No. DE-SC0003996 monitored by Dr. John Vetrano), who funded the cyclic experiments and analysis detailed in this paper. The authors also thank the Horace J. Rackham School of Graduate Studies and the University of Michigan for the start-up funding that allowed the initiation of this work in 2009. The authors would like to acknowledge Professor John Shaw for the generous use of his IR camera, and Mr. Benjamin Reedlunn for his experimental assistance. The authors thank Dr. Joel Bernier and Ms. Anne Juggernauth for texture measurements.

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  1. Department of Mechanical Engineering, The University of Michigan, Ann Arbor, MI, 48109, USA

    K. Kim (SEM member) & S. Daly (SEM member)

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  1. K. Kim
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  2. S. Daly
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Correspondence to S. Daly.

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Kim, K., Daly, S. Martensite Strain Memory in the Shape Memory Alloy Nickel-Titanium Under Mechanical Cycling. Exp Mech 51, 641–652 (2011). https://doi.org/10.1007/s11340-010-9435-2

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  • DOI: https://doi.org/10.1007/s11340-010-9435-2

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