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In Situ Optical Microscope Study of the Thermally Induced Displacive Transformations in Cualni-Based Shape-Memory Alloys

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Abstract

In situ optical microscope examinations were carried out on the thermally induced thermoelastic martensitic transformation in an untrained CuAlNi alloy and on the bainitic reaction in a CuAlNiMnFe alloy. It was found that a different martensite variant structure formed after every thermal cycle and the transformation was not accompanied with observable plastic deformation in the CuAlNi alloy. Elastic deformations were observed as the martensite plates reached grain boundaries. The growth of new martensite plates was initiated at these locations. The result are discussed and compared to results of other alloys found in the literature. The bainitic reaction was found to occur under isothermal conditions in the CuAlNiMnFe alloys. The reaction was accompanied with a relief formation much finer than that of the thermoelastic martensitic transformation.

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Acknowledgments

The research work was based on the results achieved within the TÁMOP-4.2.1.B-10/2/KONV-2010-0001 project and carried out as part of the OTKA K 84065 project.

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Authors and Affiliations

  1. MTA-ME Materials Science Research Group, Miskolc-Egyetemvaros, 3515, Hungary

    M. Benke

  2. Institute of Physical Metallurgy, Metalforming and Nanotechnology, University of Miskolc, Miskolc-Egyetemvaros, 3515, Hungary

    V. Mertinger

Authors
  1. M. Benke
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  2. V. Mertinger
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Correspondence to M. Benke.

Additional information

This article is an invited paper selected from presentations at the International Conference on Shape Memory and Superelastic Technologies 2013, held May 20-24, 2013, in Prague, Czech Republic, and has been expanded from the original presentation.

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Benke, M., Mertinger, V. In Situ Optical Microscope Study of the Thermally Induced Displacive Transformations in Cualni-Based Shape-Memory Alloys. J. of Materi Eng and Perform 23, 2333–2338 (2014). https://doi.org/10.1007/s11665-014-1078-5

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  • DOI: https://doi.org/10.1007/s11665-014-1078-5

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