期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.12.069
关键词
Electron microscopy; Mechanical characterization; Ceramics; Intermetallics; Composites
类别
资金
- National High Technology Research and Development Program of China (863 Plan) [2015AA034404]
- Natural Science Foundation of China [51272141]
- Taishan Scholars Project of Shandong [TS20110828]
- Science and Technology Development planning of Shandong [2014GGX102026]
TiAl/Ti2Al composites were successfully synthesized by vacuum arc melting with TiC, graphite powder, and carbon nanotubes (CNTs) as carbon sources. As the amount of Ti2AlC ceramic increased, the microhardness and compressive strength of the TiAl/Ti2AlC composites improved linearly. Importantly, the TiAl/Ti2AlC prepared with TiC as the carbon source exhibited higher microhardness and compressive, strength than that composites prepared with graphite powder or CNTs. During vacuum arc melting, three reactions occur successively: Ti+Al -> TiAl, Ti+C -> TiC, and TiAl+TiC -> Ti2AlC. Ti2AlC was formed by peritectic reaction between the TiAl melt and TiC particles. A large amount of TiC was left in the TiAl matrix, which acted to improve the hardness and strength of the composites. The fracture behavior of the composite was mainly transgranular fracture. The pinning, pulling out, and the effect of crack deflecting of TiC particles, together with the interlayer tearing, plastic shearing, folding, and crimping of Ti2AlC played a key role in the improvement of the strength and plasticity of the composites.
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