关键词: Cu-Cr-Zr-Co-Si合金, 形变时效, 再结晶, 析出, 导电率, 硬度

Abstract: By measuring the dynamic changes of the electrical conductivity of cold-rolled Cu-Cr-Zr-Co-Si alloy during isothermal aging, based on the approximate linear correlation between the electrical conductivity of the precipitation-strengthened alloy and the transformation ratio of precipitation transformation, the Avrami kinetic equations and curves of the aging precipitation process of the alloy with different cold deformation were established, on which the interaction between recrystallization and aging precipitation was analyzed. The results show that the electrical conductivity and transformation ratio of precipitation transformation of the alloy increase with the increase of deformation and aging time, which is the result of interaction of recrystallization and aging precipitation during aging. With the increase of cold deformation, the precipitation of strengthening phase is obviously accelerated, but the aging precipitation does not significantly prevent or delay the recrystallization softening process. Therefore, heavy cold deformation and short-term aging can lead to higher hardness peaks, but the optimum conductivity can't be obtained at the same time. Only on the premise that the precipitation starts earlier than the recrystallization, and the precipitates can significantly prevent the recrystallization, the best effect can be achieved by using the combined deformation and aging.

Key words: Cu-Cr-Zr-Co-Si alloy, deformation aging, recrystallization, precipitation, electrical conductivity, hardness