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On the competition between the stress-induced formation of martensite and dislocation plasticity during crack propagation in pseudoelastic NiTi shape memory alloys

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Abstract

The present work addresses the competition between dislocation plasticity and stress-induced martensitic transformations in crack affected regions of a pseudoelastic NiTi miniature compact tension specimen. For this purpose X-ray line profile analysis was performed after fracture to identify dislocation densities and remnant martensite volume fractions in regions along the crack path. Special emphasis was placed on characterizing sub fracture surface zones to obtain depth profiles. The stress affected zone in front of the crack-tip is interpreted in terms of a true plastic zone associated with dislocation plasticity and a pseudoelastic zone where stress-induced martensite can form. On unloading, most of the stress-induced martensite transforms back to austenite but a fraction of it is stabilized by dislocations in both, the irreversible martensite and the surrounding austenite phase. The largest volume fraction of the irreversible or remnant martensite along with the highest density of dislocations in this phase was found close to the primary crack-tip. With increasing distance from the primary crack-tip both, the dislocation density and the volume fraction of irreversible martensite decrease to lower values.

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ACKNOWLEDGMENTS

T.U. is grateful to the Humboldt Foundation of Germany for supporting this research. JF, SG and GE acknowledge funding by the German Research Association (DFG) through project C1 of SPP 1544 (Ferroic Cooling). G.R. gratefully acknowledges the support of the János Bolyai Research. Fellowship of the Hungarian Academy of Sciences. The authors thank Dr. G. Csiszár for the assistance in carrying out the X-ray diffraction experiments.

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Authors and Affiliations

  1. Department of Materials Physics, Eötvös University Budapest, Budapest, H-1518, Hungary

    Tamas Ungár, Gábor Ribárik & Levente Balogh

  2. School of Materials, The University of Manchester, Manchester, M13 9PL, UK

    Tamas Ungár & Gunther Eggeler

  3. Institut für Werkstoffe, Ruhr-Universität Bochum, 44801 Bochum, Germany

    Jan Frenzel & Susanne Gollerthan

  4. Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario, K7L 3N6, Canada

    Levente Balogh

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  1. Tamas Ungár
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Correspondence to Tamas Ungár.

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Dedicated to the 80th Birthday of Professor Haël Mughrabi.

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

A previous error in this article has been corrected. For details, see 10.1557/jmr.2017.459

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Ungár, T., Frenzel, J., Gollerthan, S. et al. On the competition between the stress-induced formation of martensite and dislocation plasticity during crack propagation in pseudoelastic NiTi shape memory alloys. Journal of Materials Research 32, 4433–4442 (2017). https://doi.org/10.1557/jmr.2017.267

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