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2175 |
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Microstructural characterization of plasma sprayed Fe3Al/TiC composite coatings |
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Chang-Jiu Li / Xi'an Jiaotong University, P.R. China Li-Hui Tian / School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China Cheng-Xin Li/ School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China Xiao-Ming Wang/ School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China Bo Song/ School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China |
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Fe3Al intermetallics matrix composites reinforced by ceramic particles such as TiC have attracted much attention in recent years owing to their high temperature strength. In this study, atmospheric plasma spraying (APS) was employed to fabricate Fe3Al/TiC composite deposit using the cryomilled Fe (Al)/TiC powders. The post-spray annealing treatment was applied to the as-sprayed deposit to control deposit microstructure. The microstructure evolution of the Fe-Al/TiC composite powders during mechanical alloying was investigated. The effect of annealing treatment on the microstructure of the as-sprayed Fe (Al)/TiC composite coatings was examined. The microstructures of the powders and coatings were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that the microstructure of the plasma-sprayed Fe3Al/TiC coating was significantly influenced by the annealing temperature. Fe (Al) alloy matrix in the deposit was completely transformed to the intermetallic compound by the annealing treatment at a temperature higher than 600oC. Fe3Al intermetallic matrix/TiC composite could be obtained through atmospheric plasma-spraying of cryomilled Fe(Al)/TiC composite powders followed by annealing treatment. |