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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of TiC particle size on microstructure and mechanical properties of 1%TiCp/W composites
YU Fu-wen(于福文)1, WU Yu-cheng(吴玉程)1, CHEN Yong(陈  勇)1,
DENG Jing-quan(邓景泉)1, CHEN Jun-ling(陈俊凌)2

1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;

Abstract:The nano-TiCp/W and micro-TiCp/W composites containing 1% TiC(mass fraction) particles with average particle sizes of 50 nm and 1.5 μm were fabricated respectively by high energy ball milling and vacuum hot pressing (VHP) at 2 373 K, 30 MPa, in a vacuum of 1×10−3 Pa. Microstructure and mechanical properties of the composites were examined at room temperature. The results show that both n-TiC and μ-TiC particles are homogeneously distributed in the as-sintered composites. The size of n-TiC particle is about 100 nm, and that of μ-TiC particle is about 1 μm. The additions of n-TiC and μ-TiC particles both result in higher mechanical properties compared with monolithic W. The improved mechanical properties may be mainly attributed to the grain size strengthening, dispersion strengthening and grain boundaries strengthening. The addition of n-TiC particles to tungsten is found to have beneficial effects on the mechanical properties than that of μ-TiC due to its small size.

 

Key words: tungsten; titanium carbide; composites; particle size; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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