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Stress-assisted removal of conjugation boundaries in non-modulated Ni–Mn–Ga by coordinated secondary twinning

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Abstract

Observations are presented, obtained by in situ straining and conventional TEM, of a transformation mechanism by coordinated secondary twinning predicted by Mullner and King. The material studied is the martensitic phase of a non-modulated Ni–Mn–Ga alloy, which exhibits a microstructure comprising domains of lamellar matrix/twin composites. Straining these specimens induced lamellar domains to transform into their conjugate counterparts. In this process, secondary twinning generates a change of misorientation between the matrix and twin lamellae of the initial domain by nearly 23°. The orientation evolves over a region behind the transformation front about 100 nm in extent.

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Acknowledgements

We thank Nikki Kucza and Martika Flores-Ramos for assistance with the growth of single crystals. We acknowledge partial financial support from the National Science Foundation through grant DMR-1008167, and NSF MRI awards 0521315 (TEM) and 0619795 (XRD). The research described in this paper is part of the Chemical Imaging Initiative at Pacific Northwest National Laboratory under Contract DE-AC05-76RL01830 operated for DOE by Battelle. A portion of the research was performed using EMSL, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Boise State University, Boise, ID, 83725, USA

    B. Muntifering, W. B. Knowlton & P. Müllner

  2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352, USA

    L. Kovarik & N. D. Browning

  3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, UK

    R. C. Pond

  4. Department of Electrical and Computer Engineering, Boise State University, Boise, ID, 83725, USA

    W. B. Knowlton

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  1. B. Muntifering
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  2. L. Kovarik
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  3. N. D. Browning
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  4. R. C. Pond
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  5. W. B. Knowlton
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  6. P. Müllner
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Correspondence to B. Muntifering.

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Muntifering, B., Kovarik, L., Browning, N.D. et al. Stress-assisted removal of conjugation boundaries in non-modulated Ni–Mn–Ga by coordinated secondary twinning. J Mater Sci 51, 457–466 (2016). https://doi.org/10.1007/s10853-015-9236-1

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  • DOI: https://doi.org/10.1007/s10853-015-9236-1

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