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Fracture Toughness of Cold Sprayed Pure Metals

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Abstract

The study of fracture toughness of pure Al, Cu, Ni and Ti deposited by cold spray was performed in order to obtain a fundamental understanding of the damage process and quantify the material performance. Rectangular specimens cut from self-standing deposits with fatigue pre-cracks were tested in three-point bending. The KIC values were obtained from J-R curves following the ASTM E1820 standard. The stress–strain behavior of the tested material was obtained from supplementary four-point bending. The cold spray deposits exhibited significantly lower fracture toughness than the corresponding wrought materials. The reduction was more pronounced for coatings with limited ductility (Ti and Cu), where the fracture toughness reached less than 12% of the wrought counterpart only. The higher ductility coatings of Al and Ni possessed fracture toughness of 18–25% of the wrought reference materials. The performed fractographic analysis revealed inter-particular decohesion as the major failure mode.

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Acknowledgments

Financial support by the European Regional Development Fund in the frame of the project Centre of Advanced Applied Sciences (No. CZ.02.1.01/0.0/0.0/16_019/0000778) and the Czech Science Foundation project GACR 17-13573S is gratefully acknowledged. Petr Jaroš is acknowledged for the highly precise miniature strain gaging work.

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Authors and Affiliations

  1. Department of Materials, Faculty of Nuclear Science and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic

    Ondrej Kovarik & Jan Siegl

  2. Institute of Plasma Physics, The Czech Academy of Sciences, Prague, Czech Republic

    Jan Cizek & Tomas Chraska

  3. Institute of Materials Science and Engineering, Brno University of Technology, Brno, Czech Republic

    Jan Cizek

  4. Impact Innovations GmbH, Rattenkirchen, Germany

    Jan Kondas

  5. Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy

    Jan Kondas

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  1. Ondrej Kovarik
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  2. Jan Siegl
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  3. Jan Cizek
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  4. Tomas Chraska
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Correspondence to Ondrej Kovarik.

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Kovarik, O., Siegl, J., Cizek, J. et al. Fracture Toughness of Cold Sprayed Pure Metals. J Therm Spray Tech 29, 147–157 (2020). https://doi.org/10.1007/s11666-019-00956-z

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