Abstract
Microstructure dependence of elastic modulus and internal friction of APSed CoNiCrAlY was investigated using resonance ultrasound spectroscopy. The freestanding coatings with different spraying powder sizes are prepared. Further, the annealed coatings were prepared. The specimens were oscillated using a transducer, and the resonance frequencies and modes were determined using a laser Doppler interferometer. As a result, it was found internal friction was decreased and Young's modulus was increased by thermal treatment because of sintering. On the other hand, the internal friction did not change depending on the spraying powder size. The Young's modulus was increased with a decrease of spraying powder size because of high oxidization.
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