PSI - Issue 50

N.B. Pugacheva et al. / Procedia Structural Integrity 50 (2023) 251–256 N.B. Pugacheva et al./ Structural Integrity Procedia 00 (2022) 000 – 000

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4. Conclusion The study has revealed that the Cu-Ti-C-B composite consists of a copper-based solid solution matrix and the strengthening phases TiC and TiB 2 sized 0.5 to 10 μm. Single B 4 C particles unreacted in SHS have been detected. These particles show high hardness (3332 ± 5.9) HV 0.1. The strengthening phases TiC, TiB 2 , and B 4 C provide the composite with high overall hardness, namely 60 to 62 HRC. The density of the composite is 6.8 g/cm 3 . The Cu+TiC mechanical mixture is the most plastic constituent of the composite; it can relax stresses arising under external mechanical loading. Due to the predominance of this constituent in the bulk of the composite, the specimens undergo ductile fracture. This makes the composite highly strong in transverse bending tests ( R bm 30 = 820 MPa).

Acknowledgments The study was supported by RSF grant No. 22-29-00188 (registration No. 122012600194-2).

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