期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141442
关键词
Tungsten; Titanium carbide; Nano-size powders; W-TiC composite; LAGB; W-TiC interface; Mechanical properties
类别
资金
- National Key Research and Development Program of China [2017YFB0306001]
This study successfully fabricated a tungsten-6wt% TiC composite with fine grain size, and analyzed its microstructure using techniques such as transmission electron microscopy, scanning transmission electron microscopy, and electron backscatter diffraction. The research shows that a Ti-concentration zone existed in the TiC phase due to high defect density induced by high-energy milling in the composite.
To broaden the application field of tungsten, low-density tungsten-based composites need to be developed. In this study, a W-6 wt% TiC composite with a fine grain size was successfully fabricated by pressureless sintering. Transmission electron microscopy (TEM) analysis shows that the W-TiC interface in the composite is coherent. Furthermore, STEM analysis shows that a Ti-concentration zone (TCZ) with a width of -30 nm along the W-TiC interface exists in the TiC phase, which is attributed to high defect density in TiC induced by high-energy milling. EBSD analysis shows that the composite has a considerable portion of LAGBs (13.5% in W-W boundaries and 32.5% in TiC-TiC boundaries). The modified interface and fine grain improve the mechanical properties of the composite: the ultimate tensile strength and Vickers hardness reached 630 MPa and 6.72 GPa, respectively.
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