Effect Of Heat Treatment On Microstructure And Mechanical Properties Of Cu-Ni-Co Alloy

Copper and copper alloy smelting and processing in China has quite a long history, With the development of modern industrial society’s progress, copper alloy mechanical, thermal and electrical conductivity and other physical properties are widespread concerns related industries is also increasing. Modern industrial production of copper alloy parts, components and other requirements often fully integrated performance copper alloys, copper alloys, as some intelligent switching element requires both the overall performance of copper alloy thermal conductivity, electrical conductivity, flexibility.In order to achieve fully demonstrated excellent overall performance copper alloys aimed not only the need for more in-depth study and discussion in the choice of alloying elements, add volume ratio and alloy subsequent heat treatment and so on. This article uses the casting method with copper, pure nickel, pure cobalt, mixed rare earth raw materials for the preparation of novel high-strength copper-nickel-cobalt alloy.In this experiment, measurement and analysis tools, scanning electron microscopy, optical microscopy, XRD, EDX analysis, a comprehensive study of the characteristics of the tissue copper-nickel-cobalt alloy, morphology,precipitated phase ingredients.The experiments carried out on the copper-nickel-cobalt alloy:solution-Aging-cryogenic and solid solution-Cryogenic-two different aging heat treatment, and the microstructure and mechanical properties after heat treatment process two were studied after heat treatment.The results showed that:solution-Aging-alloy hardness cryogenic treatment is slightly better than the solution-Cryogenic-alloy aging treatment. When the Co content of0.6, whether through Solution-Aging-cryogenic treatment or solution-Cryogenic-aging hardness greater than Co0.6or Co0.8of the hardness, When Co0.4after solution heat treatment process of930℃/2h,550℃aging/2h, cryogenic treatment can get the highest hardness of96.1. After solution heat treatment process of870℃/2h, low temperature/2h, aging550℃/2h treatment can get the highest hardness of94.1. When Co0.6after solution heat treatment process of930℃/2h,550℃/2h aging, cryogenic/2h treatment can get the highest hardness of102.1. After solution heat treatment process of870℃/2h, low temperature/2h, aging550℃/2h treatment can get the highest hardness of95.4. When Co0.8after solution heat treatment process of930℃/2h,550℃/2h aging, cryogenic/2h treatment can get the highest hardness of97.3After solution heat treatment process of870℃/2h, low temperature/2h, aging550℃/2h treatment can get the highest hardness of94.7.Research results show that:adding alloying elements nickel, cobalt improves the organization of mixed rare earth alloy, the alloy after heat treatment at a (Cu) phase matrix k precipitated phase and enriched in the matrix, k-rich phase segregation forming GP zones. k phase (CoNi) Cu4, a small amount of rare earth elements and nickel, cobalt forming metal compounds, precipitates produced copper alloy matrix reinforced so that it be strengthened. With the increase of Co content, aging temperatures, brinell hardness of copper nickel and cobalt alloy.