Journal of Materials Science

, Volume 50, Issue 9, pp 3320–3328 | Cite as

Microstructure and properties of TiB2 particles reinforced Cu–Cr matrix composite

Original Paper


Copper–chromium matrix composites reinforced by TiB2 particles were prepared by in situ reaction between titanium and copper–boron alloy in the melt. The microstructures, mechanical, and electrical properties of the composite were investigated under as-cast and aging conditions. The results indicate that the TiB2 particles are formed by in situ reaction in matrix. The addition of TiB2 in composite reduces the segregation degree of Cr particles in matrix and inhibits the coarsening of Cr particles at high aging temperature. High hardness of Cu–Cr–TiB2 composite is achieved due to the multiple hardening mechanisms, which are in situ TiB2 particles hardening and precipitation hardening from Cr particles. The wear resistance of composite presents a dramatic improvement due to the formation of TiB2 particles, and TiB2 particles have significant effect on wear mechanism of Cu–Cr–TiB2 composite. The conductivity of composite is lower than that of Cu–Cr alloy, which is attributed to higher resistivity of TiB2 particles and the incremental interface scattering caused by TiB2 particles. But the composites with high TiB2 content still have considerable conductivity after aging.


Wear Rate Wear Surface Impurity Scattering TiB2 Particle High Aging Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors gratefully acknowledge the supports of National Natural Science Foundation of China (Nos. 51134013, 51271042).


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringDalian University of TechnologyDalianChina
  2. 2.Laboratory of Special Processing of Raw MaterialsDalian University of TechnologyDalianChina

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