Cu-5.0wt%Al_2O_3合金退火性能研究

Study on Annealing Characteristics of Al_2O_3 Particle Dispersion Strengthened Copper Alloy

采用内氧化法制备Cu-5wt%Al2O3,通过力学性能、电学性能、扫描电镜断口及透射电镜研究了此类合金的热变形及退火态组织和性能的变化。结果表明:随热变形量的增加,合金硬度不断升高,电导率缓慢降低。经78.4%的热变形后,硬度和导电率分别为87HRB和60.9%IACS,该合金软化温度达950℃以上。透射电镜组织表明900℃×2h退火后,合金局部出现再结晶。合金为微孔聚集型断裂,且随退火温度升高,韧窝尺寸变大。

Cu-5wt%Al203 Alloy was fabricated by internal oxidation, and its annealling characteristics microstructure was studied by mechanical and electric property measurement, SEM fracture analysis and TEM observation. The results show that with increasing hot deformation, the hardness increases gradually, whereas the conductivity decreases. When the alloy＇s hot rotary forging deformation is 78.4%, the hardness and conductivity reach 87 HRB and 60.9%IACS, respectively. After the alloy with 78.4% hot rotary forging is annealed at different temperature, the conductivity increases, the softening temperature can reach above 950 ℃. TEM observation indicates that after annealing at 900 ℃, the recrystallization of copper grains occurs locally. SEM fracture analysis demonstrates that the fracture mechanism is ductile fracture. The size of dimples increase with the increase of annealing temoerature.