Abstract
In order to uniformly disperse the ceramic reinforcements synthesized in situ in the copper matrix composites, this study used Carbon Polymer Dot (CPD) as the carbon source and Cu-1.0%Ti alloy powder as the matrix to supply the Ti source for manufacturing in situ synthesized TiC/Cu composites. The results showed that TiC nano-precipitate formed in the grains interior and grain boundaries, with particle sizes that were similar to the CPD size and maintained a uniform distribution state. Compared with the matrix, 0.3 wt% CPD/Cu composite displayed the best strength-plastic compatibility, the UTS had achieved to be 385 MPa accompanied with a corresponding EL of 21%. This was owing to the dislocation hindrance caused by nano-carbide and excellent interface bonding between nano TiC and the Cu matrix. The density function theory calculation had supported our experimental results, which showed a tighter and stronger interface contact. This paper presents a new approach for studying in situ carbide precipitates. To create the in situ synthesized nano-sized TiC/Cu composites, Carbon Polymer Dot (CPD) was used as the carbon source. Theoretical and experimental findings support the strong interfacial bonding between TiC and copper matrix. The proposed method of in-situ synthesized nano-scaled TiC demonstrates to be a novel way to construct high-performance Cu matrix composites with both enhanced strength and plasticity.
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