Effects Of Differed Enhancing Phase On Properties Of Dispersion-Strengthened Copper-Alloy

This article introduces a mechanical alloying method to research and manufacture a kind of alloy with high strength and electrical conductivity. Dispersion-strengthened copper has characteristics of high strength, good electrical conductivity, high-softened temperature, etc. It is already extensively applied in manufacturing and integrated circuit.To manufacture dispersion-strengthened copper with MA method is feasible and simple. This article analyzes the electrical conductivity, hard degree and densities of electrolysis non-oxygen native copper powder which is manufactured with powder metallurgy method, and makes sure the best burning-knot temperature is 950C. Then high power ball whetting machine is elected to ball whet the metals powder. By a large quantity of experiments, appropriate ball whet technology is decided.The research shows different influence in strength and electrical conductivity rate with WC, TiB2 and Cr3C2 used as dispersing enhancing phase respectively when the volume fraction is fixed. The second phase will be mingled with copper powder and will ball whetted, then reverting through annealing, pressing type, burning knot, forging, finally process to standard experimental sample with machine. Experiments show that samples can be manufactured by add is 5 %(Vol%)various second phase into copper alloy, under the circumstance of burning knot at 950Cx2h, forging at 900C-950 C:WC as the enhancing phase, higher electrical conductivity rate achieved; Cr3C2 particles enhanced strength; TiB2 particles result in less strength and lower electrical conductivity rate. It is not the second phase particle itself but its small evenly divided state that contributes to the strength of the copper alloy. The electrical conductivity rate of dispersion-strengthened copper is lower than the burning-knot copper's, and the second phase particle itself has not much to do with the electrical conductivity rate of alloy. Impure iron involved will spoil the electrical conductivity in the course of MA. Sored copper is employed as grinding pot instead of stainless steal.In this article, approaches to improve the properties of dispersion-strengthened copper are discussed and it laid the foundation for further research and application.