论文部分内容阅读
在Gleeble-1500D热模拟机上对Cu-1%Zr和Cu-1%Zr-0.15%Ce两种合金在变形温度分别为550,650,750,850和900℃,应变速率分别为0.001,0.010,0.100,1.000和10.000 s~(-1)条件下进行等温热压缩实验,分析了Ce对Cu-1%Zr合金热变形激活能的影响。通过透射电子显微镜,研究了合金在时效过程中的析出相和位错组态。结果表明:Cu-1%Zr和Cu-1%Zr-0.15%Ce两种合金具有相似的热压缩变形特征。高Zr和微量Ce的添加使Cu-Zr合金的热变形激活能显著提高。与Cu-1%Zr合金相比,添加0.15%Ce使合金的热变形激活能提高了约34%。添加Ce,使导电率下降了约5%IACS,显微硬度略有提高。通过导电率的变化,计算出时效过程中析出相体积分数,求得550℃时合金的析出动力学方程和导电率方程。
The deformation temperatures of Cu-1% Zr and Cu-1% Zr-0.15% Ce alloys at 550, 650, 750, 850 and 900 ℃ were respectively measured on a Gleeble-1500D thermal simulator at strain rates of 0.001, 0.010, 0.100, 1.000 and 10.000 s ~ (-1), the effect of Ce on the thermal deformation activation energy of Cu-1% Zr alloy was analyzed. The phases and dislocation configurations of the alloys during aging were investigated by transmission electron microscopy. The results show that the two alloys Cu-1% Zr and Cu-1% Zr-0.15% Ce have similar hot compression deformation characteristics. The addition of high Zr and trace Ce markedly enhanced the heat deformation activation energy of Cu-Zr alloy. Compared with Cu-1% Zr alloy, addition of 0.15% Ce increases the hot deformation activation energy of the alloy by about 34%. The addition of Ce reduced the electrical conductivity by about 5% IACS, with a slight increase in microhardness. Through the change of conductivity, the volume fraction of precipitated phase in the aging process was calculated, and the precipitation kinetics equation and conductivity equation of the alloy at 550 ℃ were obtained.