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采用内氧化工艺制备了Al2O3弥散强化Cu-Al2O3/(Ce+Y)复合材料,分析了其显微组织,并对冷轧变形的复合材料的微观组织和性能进行了分析。结果表明:Cu-Al-(Ce+Y)合金薄板内氧化后固溶的Al脱溶与[O]形成Al2O3,TEM分析表明,大量细小均匀的γ-Al2O3相弥散分布在铜基体上,粒径约为5～20 nm,粒子间距为10～50 nm,并且沿晶面(440)和晶向[11 2]析出;Cu-Al2O3/(Ce+Y)复合材料经60%变形后,Al2O3呈链状分布,与Cu晶粒被拉长方向一致,形成明显的纤维组织;Cu-Al2O3/(Ce+Y)复合材料的显微硬度和抗拉强度随变形量的增大逐渐增加,当变形量为80%时,显微硬度值约为内氧化后原始试样显微硬度的1.4倍,抗拉强度比原始试样的抗拉强度增加了165 MPa,而导电率下降约4%IACS。
The Al2O3 dispersion-strengthened Cu-Al2O3 / (Ce + Y) composite was prepared by the internal oxidation process. The microstructure of the composite was analyzed. The microstructure and properties of the cold-deformed composite were analyzed. The results show that after solid solution of Al in the Cu-Al- (Ce + Y) alloy sheet, Al dissolves and [O] forms Al2O3, TEM analysis shows that a large number of fine and uniform γ-Al2O3 phases disperse on the copper matrix, The diameter of the Cu-Al2O3 / (Ce + Y) composites is about 60 nm, the diameter of the Cu-Al2O3 / (Ce + Y) composites is about 5-20 nm, the spacing of the particles is 10-50 nm and precipitates along the crystal plane (440) The distribution of Cu-Al 2 O 3 / (Ce + Y) composites increases with the increase of deformation when the Cu-Al 2 O 3 / Ce + When the amount of deformation is 80%, the microhardness value is about 1.4 times of the microhardness of the original sample after internal oxidation, the tensile strength is increased by 165 MPa compared with the tensile strength of the original sample, and the conductivity is decreased by about 4% IACS .