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Tailoring the Microstructure in Polycrystalline Co–Ni–Ga High-Temperature Shape Memory Alloys by Hot Extrusion

  • SPECIAL ISSUE: HTSMA 2018, INVITED PAPER HTSMA
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Abstract

Co–Ni–Ga alloys represent a new class of promising high-temperature shape memory alloys allowing realization of functional components for applications at elevated temperatures. Single crystals show a fully reversible pseudoelastic response at temperatures up to 500 °C. However, for most industrial applications, the application of polycrystalline material is needed. Polycrystalline Co–Ni–Ga alloys suffer from the anisotropic properties inherent to shape memory alloys, i.e., a strong orientation dependence of transformation strains, and therefore, are prone to intergranular fracture. This drawback can be curtailed by using appropriately textured material with a favorable grain-boundary orientation distribution. The current study discusses the impact of a hot-extrusion process on microstructural evolution and functional properties of polycrystalline Co–Ni–Ga high-temperature shape memory alloys paving the way to their robust application.

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Acknowledgements

Financial support by the Deutsche Forschungsgemeinschaft (DFG) within the Research Unit Program “Hochtemperatur-Formgedächtnislegierungen” (Project Number 200999873; Grant Nos. NI1327/3-2 and MA1175/34-2) is gratefully acknowledged.

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Authors and Affiliations

  1. Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, 30823, Garbsen, Germany

    E. Karsten, G. Gerstein, O. Golovko, A. Dalinger & H. J. Maier

  2. Institut für Werkstofftechnik/Metallische Werkstoffe, Universität Kassel, 34125, Kassel, Germany

    C. Lauhoff, P. Krooss & T. Niendorf

  3. National Metallurgical Academy of Ukraine, Gagarina Avenue, 4, Dnipro, Ukraine

    A. Samsonenko

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  1. E. Karsten
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  2. G. Gerstein
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  3. O. Golovko
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  5. C. Lauhoff
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  8. A. Samsonenko
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  9. H. J. Maier
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Correspondence to E. Karsten.

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Karsten, E., Gerstein, G., Golovko, O. et al. Tailoring the Microstructure in Polycrystalline Co–Ni–Ga High-Temperature Shape Memory Alloys by Hot Extrusion. Shap. Mem. Superelasticity 5, 84–94 (2019). https://doi.org/10.1007/s40830-019-00208-7

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  • DOI: https://doi.org/10.1007/s40830-019-00208-7

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