Abstract
This work is devoted to investigation of the structure of Ti-TiAl3 composites reinforced by TiB2 or TiC hard particles and obtained by spark plasma sintering of elemental foils and ceramic powders. Sintering was carried out at the temperature of 830 oC under the pressure of 40 MPa during 10 minutes. Microstructure of the composites obtained was represented by alternated layers of titanium and intermetallic compound TiAl3. Also, it was found that at the Ti-TiAl3 interfaces thin intermediate layers were formed. Quantitative elemental analysis of these layers showed that Ti3Al, TiAl, and TiAl2 compounds, as well as Ti (Al) solid solution could be formed in these zones. Diffraction analysis did not reveal any transformations of initial reinforcing phases after sintering. Interlayers with titanium diboride had the average microhardness level of 3988 HV, and the average microhardness level of interlayers with TiC was 1610 HV.
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