Improving mechanical properties of copper composite by interconnected MoO2 quantum dots
The strengthening effect of particle-reinforced copper-based composites mainly depends on the interfacial bonding strength and dispersibility of the reinforcement. However, agglomeration of nanoparticles , as a bottleneck, restricts Orowan's strengthening mechanism. Different from the traditional preparation method for stacked nanoparticles, a hydrothermal method was developed to prepare interconnected bridge-like MoO 2 quantum dots . Based on the interconnected structure and the brittleness of MoO 2 , it can be easily broken and uniformly dispersed into copper matrix during the ball milling process. Due to the dispersion strengthening effect and coherence of the interface between MoO 2 and copper, these factors improve the mechanical performance of the composite material synergistically, resulting in simultaneous increases in YS (145.76 MPa), UTS (321.67 MPa), and hardness (94.79 Hv). The effectiveness of YS and UTS enhancement is 234% and 41%, respectively, while maintaining appropriate elongation (20.29%) and conductivity (94.9 IACS). MoO 2 quantum dots are used for the first time in this work as particle reinforcements , and we demonstrate that the addition of oxide quantum dots to metal matrix composites can significantly enhance the mechanical properties of the composites by changing the morphology of the quantum dots.
危险品化学品经营许可证（带存储）