Cu-Al2O3弥散强化铜合金接触线的组织和性能

采用内氧化法制备的Cu-Al2O3弥散强化铜合金接触线,并对其组织和性能进行了研究。结果表明:Cu-Al2O3合金接触线抗拉强度达到568 MPa,导电率达到84%IACS,载流量达到764 A,技术性能优于TB/T 2809-2017标准中Cu-Cr-Zr合金接触线的技术要求;其强化机制主要为细晶强化及Al2O3粒子引起的弥散强化和应变强化;由于合金基体内Al2O3粒子不均匀,导致合金内部组织的不均匀,从而引起显微组织的尺寸不均和拉伸断口混合断裂的断裂方式。

Microstructure and properties of Cu-Al2O3 dispersion strengthened copper alloy contact wire

Cu-Al2O3 dispersion strengthened copper alloy contact wire was prepared by internal-oxidation method, and its microstructure, mechanical and electrical properties were studied. The results show that the tensile strength, the conductivity and the current carrying capacity of the Cu-Al2O3 alloy contact wire are 568 MPa, 84 %IACS and 764 A, respectively, and the technical properties of the Cu-Al2O3 alloy contact wire are better than those of the Cu-Cr-Zr alloy contact wire in TB/T 2809-2017 standard. The strengthening mechanisms of the alloy are mainly fine grain strengthening, the dispersion strengthening and strain strengthening caused by Al2O3 particles. Due to the non-uniformity of the Al2O3 particles in the alloy matrix, the internal microstructure of the alloy is non-uniform, which leads to the microstructure with non-uniform size, and the fracture mode of tensile fracture is the mixed fracture.