Microstructure and properties of TiB2 particles reinforced Cu–Cr matrix composite
Microstructure and properties of TiB2 particles reinforced Cu–Cr matrix composite
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DOI：
10.1007/s10853-014-8762-6
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发表时间：
2015-02
影响因子：
4.5
通讯作者：
Pengchao Zhang;J. Jie;Hang Li;Tongmin Wang;Tingju Li
中科院分区：
文献类型：
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作者：
Pengchao Zhang;J. Jie;Hang Li;Tongmin Wang;Tingju Li
通过钛与铜硼合金在熔体中原位反应制备了TiB2颗粒增强的铜铬基复合材料。在铸态和时效条件下研究了复合材料的微观结构、机械和电性能。结果表明，TiB2颗粒是在基体中通过原位反应形成的。复合材料中TiB2的添加降低了基体中Cr颗粒的偏聚程度，抑制了高时效温度下Cr颗粒的粗化。 Cu-Cr-TiB2复合材料的高硬度是由于多种硬化机制而实现的，这些硬化机制包括TiB2颗粒的原位硬化和Cr颗粒的沉淀硬化。由于TiB2颗粒的形成，复合材料的耐磨性得到显着提高，并且TiB2颗粒对Cu-Cr-TiB2复合材料的磨损机制有显着影响。复合材料的电导率低于Cu-Cr合金，这是由于TiB2颗粒较高的电阻率以及TiB2颗粒引起的界面散射增量所致。但高TiB2含量的复合材料在老化后仍具有相当的导电性。
Copper–chromium matrix composites reinforced by TiB2particles 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 TiB2particles are formed by in situ reaction in matrix. The addition of TiB2in 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–TiB2composite is achieved due to the multiple hardening mechanisms, which are in situ TiB2particles hardening and precipitation hardening from Cr particles. The wear resistance of composite presents a dramatic improvement due to the formation of TiB2particles, and TiB2particles have significant effect on wear mechanism of Cu–Cr–TiB2composite. The conductivity of composite is lower than that of Cu–Cr alloy, which is attributed to higher resistivity of TiB2particles and the incremental interface scattering caused by TiB2particles. But the composites with high TiB2content still have considerable conductivity after aging.