| High-strength and high-conductivity Cu-Cr alloy is the new functionalstructure material in recent years, it has the characters of high strength, good plasticityand excellent conductivity, and it carry much more effect in National Economy. Althroughsystematic research has been carried in the area, there are more aspects still need discuss. Theintensive analysis of Cu alloy's Precipitation behavior, its effect on alloy strength andconductivity has important mean in developing good performance high-strength andhigh-conductivity Cu-Cr alloy.The thesis uses solution aging strengthening technique, studies Cu-0.7Cr andCu-0.7Cr-0.4Zr, analyses the relationship between precipitation behavior, additiveelement, fabricating techniques and alloy strength, conductivity. Research of theproject shows: solution treatment formed supersaturated solid solution, alloystrengthen increased, conductivity decreased. After age treatment, uniform distributedprecipitating phase strengthen the process and conductivity increased, but long agewill produce coarseness of the precipitation phases appears, and strengthen will rapiddecrease after it arrives the peak. The optimum treatment process of Cu-Cr alloy is: 960℃/1h solution treatment, 450℃/20h age treatment, 360.8MPa tensile strength, 273.6Mpa yield strength, 22% elongation ratio and 80.6%IACS conductivity. Theoptimum treatment process of Cu-Cr-Zr alloy is: 900℃/1h solution treatment, 450℃/14h age treatment, 408.8MPa tensile strength, 295.0Mpa yield strength, 26%elongation ratio and 69% IACS conductivity. With the addition of Zr, precipitationphase makes alloy to express excellent mechanical properties, although with a littleloss in conductivity. According to market demand, we can use solution and agedtreatment improves the performance of Cu-Cr alloy, choose different fabricatingtechniques and addition of trace elements, and procedure satisfying high-strength andhigh-conductivity Cu-Cr alloy materials.
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