论文部分内容阅读
采用固溶+冷变形+不同直流电流密度下的时效工艺制备了Cu-0.33Cr-0.06Zr(质量分数,下同)合金试样。进行了450℃下不同时效时间及不同电流密度的时效试验,研究了时效电流和时间对Cu-0.33Cr-0.06Zr合金导电性能的影响。采用透射电镜观察时效合金组织,探讨了不同电流密度下该合金的时效析出动力学。结果表明,合金在电流密度为100A/cm2的直流电流下时效,电导率低于无电流时效的;而在电流密度为400 A/cm2下时效2h后,电导率达到49.5MS/m,接近峰值,高于无电流时效的。时效后合金析出Cr相和CuZr3相,通过对电导率与析出相体积分数关系的分析,确定了合金在不同温度下时效的相变动力学Avrami经验方程和电导率方程。
Cu-0.33Cr-0.06Zr (mass fraction, the same below) alloy samples were prepared by solid solution + cold deformation + aging at different DC current densities. The effects of different aging time and different current density at 450 ℃ on the electrical conductivity of Cu-0.33Cr-0.06Zr alloy were studied. The microstructure of aged alloys was observed by transmission electron microscope (TEM), and the aging kinetics of the alloy at different current densities was discussed. The results show that the electrical conductivity of the alloy is aging at a DC current of 100 A / cm 2, and the conductivity is lower than that without current aging. When the current density is 400 A / cm 2, the electrical conductivity reaches 49.5 MS / m, Higher than no current aging. After aging, Cr and CuZr3 phases were precipitated. Through the analysis of the relationship between the electrical conductivity and the volume fraction of the precipitated phase, the Avrami empirical equation and the conductivity equation of the phase-change kinetics of the alloy aged at different temperatures were determined.