Journal
INTERMETALLICS
Volume 33, Issue -, Pages 54-59Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2012.09.025
Keywords
Composites; Titanium aluminides, based on TiAl; Electron microscopy, transmission
Categories
Funding
- Natural Science Foundation of China [51071122]
- Aviation Science Foundation of China [2009ZF53062]
- NPU Foundation for Fundamental Research [NPU-FFR-JC2011100, JC2010021]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201107]
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SiC fiber reinforced titanium aluminides matrix composites based on TiAl (Ti-43Al-9V) were fabricated by means of matrix-coated fiber method through hot isostatic pressing. Microstructure of the SiCf/Ti-43Al-9V interfacial reaction zone in the composites was identified by means of scanning electron microscopy and transmission electron microscopy. The results show that three types of reaction products TiC, Ti2AlC and (Ti,V)(5)(Si,Al)(3) are formed between carbon coating of SiC fiber and the matrix. TiC is adjacent to the carbon coating of the SiC fiber, and (Ti,V)(5)(Si,Al)(3) is close to the matrix. Ti2AlC layer exists as columnar grains between TiC and (Ti,V)(5)(Si,Al)(3) layers. The TiC layer can be divided into fine-grained layer and coarse-grained layer. The fine-grained TiC layer contains amorphous carbon, and the coarse-grained TiC layer is separated from fine-grained TiC by an intermittent carbon layer. In addition, TiC particles are also formed between carbon coating and SiC. Furthermore, the formation mechanism of the interfacial reaction products was discussed. (C) 2012 Elsevier Ltd. All rights reserved.
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