Abstract
The paper presents the results of studying the microstructure, chemical and phase compositions of a Cu-Ti-C-B composite produced by self-propagating high-temperature synthesis (SHS). It has been found that the matrix of the composite is a titanium-doped copper-based solid solution. Titanium carbide TiC and titanium diboride TiB2 are the strengthening phases. Single particles of boron carbide B4C unreacted in SHS have been detected, with the hardness 3332 HV 0.1. The composite density is 6.8 g/cm3. The overall hardness of the composite is 60 to 62 HRC. The uneven distribution of the constituents in the volume of the composite causes the uneven distribution of its micromechanical properties. The most ductile constituent of the composite is the Cu+TiC mechanical mixture, which ensures the high ductile fracture energy of the composite in transverse bending testing. On the fracture surface, at the interface separating the B4C particles and the copper-based solid solution, there are microvoids indicating the start of microcracks growth. The strength of the composite is Rbm30 = 820 MPa.
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