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Anisotropic Elasticity of APS and HVOF CoNiCrAlY Coatings Studied by Resonant Ultrasound Spectroscopy with Laser Doppler Interferometry

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Abstract

The splat-based layered structure of thermal spray coatings leads to elastic anisotropy; however, elucidating the anisotropic elastic properties of such coatings is a challenging subject because of the limited sample size and microstructural factors such as high defect level. The objective of this study is to investigate the anisotropic elasticity of the as-sprayed and heat-treated CoNiCrAlY coatings prepared by atmospheric plasma spraying (APS) and high-velocity oxygen fuel (HVOF) spraying. For this purpose, we measure all five elastic constants accurately using resonant ultrasound spectroscopy with laser Doppler interferometry. This approach realizes the correct mode identification of the measured resonance frequencies, even for coatings with high internal friction by comparing the measured and calculated displacement distributions, providing a precise determination of the elastic constants with inverse calculation. We determined that an oriented array of defects causes a significantly low Young’s modulus along the spraying direction in both the as-sprayed coatings. Our measurements on the heat-treated coatings revealed that thermal treatment makes the APS coating stiffer than the HVOF coating, whereas the stiffness anisotropy of the APS coating remains stronger compared to the HVOF coating, even after heating. This phenomenon is consistently explained by focusing on the oxides in the coatings.

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Acknowledgments

We wish to thank Dr. T. Kuwashima (Iwate Industrial Research Institute) for his valuable contribution to preparation of the CoNiCrAlY coatings.

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  1. Department of Systems Innovation Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate, 020-8551, Japan

    Kanta Adachi & Hiroyuki Waki

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  1. Kanta Adachi
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  2. Hiroyuki Waki
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Correspondence to Kanta Adachi.

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Adachi, K., Waki, H. Anisotropic Elasticity of APS and HVOF CoNiCrAlY Coatings Studied by Resonant Ultrasound Spectroscopy with Laser Doppler Interferometry. J Therm Spray Tech 28, 1017–1024 (2019). https://doi.org/10.1007/s11666-019-00878-w

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  • DOI: https://doi.org/10.1007/s11666-019-00878-w

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