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Analysis of Variant Orientation Before and After Compression in Polycrystalline Ni50Mn29Ga21 MSMA

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Abstract

This paper deals with the microstructure and plastic deformation of Ni50Mn29Ga21 ferromagnetic shape memory alloys. In contrast to conventional shape memory alloys, plastic deformation in the martensitic phase, which is due to twin boundary motion, may be caused not only by mechanical stress but also by an external magnetic field. The polycrystalline sample was prepared by directional solidification with a texture parallel to the heat flow. Afterwards, a heat treatment follows for chemical homogenization and stress relaxation in the austenitic state. The configuration of the twin boundaries was analyzed before and after compressing the samples. The microstructure after compression was related to the magnetic properties.

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Acknowledgments

The authors are grateful to A. Pöhl for technical assistance. The work was supported by DFG SPP 1239 code Ro 962/5.

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Authors and Affiliations

  1. IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01069, Dresden, Germany

    C. Hürrich, H. Wendrock, M. Pötschke, U. Gaitzsch, S. Roth, B. Rellinghaus & L. Schultz

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  1. C. Hürrich
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  2. H. Wendrock
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  3. M. Pötschke
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  4. U. Gaitzsch
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  5. S. Roth
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  6. B. Rellinghaus
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  7. L. Schultz
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Corresponding author

Correspondence to C. Hürrich.

Additional information

This article is an invited paper selected from presentations at Shape Memory and Superelastic Technologies 2008, held September 21-25, 2008, in Stresa, Italy, and has been expanded from the original presentation.

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Hürrich, C., Wendrock, H., Pötschke, M. et al. Analysis of Variant Orientation Before and After Compression in Polycrystalline Ni50Mn29Ga21 MSMA. J. of Materi Eng and Perform 18, 554–557 (2009). https://doi.org/10.1007/s11665-009-9457-z

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  • DOI: https://doi.org/10.1007/s11665-009-9457-z

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