Effect of Plasma Spraying Process on Microstructure and Microhardness of Titanium Alloy Substrate |
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Authors: | H Zhou F Li B He J Wang B Sun |
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Affiliation: | (1) State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China |
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Abstract: | High-temperature titanium alloys are considered as good candidate materials for many aerospace applications. In order to increase
the usable temperatures and oxidation resistance of titanium alloys, plasma spraying thermal barrier coatings (TBCs) on the
titanium alloys is considered as an effective method. The effect of plasma spraying process on microstructure and microhardness
of the titanium alloy (Ti-6.6Al-3.61Mo-1.69Zr-0.28Si in wt.%) was investigated by scanning electron microscope, energy dispersion
analytical X-ray spectroscopy (EDAX) and microhardness test. The results show that the microstructure of the titanium alloy
inside the substrate keeps unchanged after plasma spraying, and no interaction and atomic diffusion happen evidently at the
bond coat/substrate interface. However there exists a thin layer of plastic deformation zone in the substrate beneath the
bond coat/substrate interface after plasma spraying. The residual stresses are induced inside the titanium alloy due to the
thermal expansion mismatch and the temperature gradient inside the substrate during plasma spraying, and lead to generating
microcracks in the surface beneath the bond coat/substrate interface and the increase of microhardness in the substrate. |
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Keywords: | microhardness microstructure plasma spraying titanium alloy |
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