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制备了不同Co含量的Cu-0.2Be-XCo合金,研究了Co含量对挤压态合金组织的影响,并考察了显微硬度、导电率及室温拉伸性能随Co含量的变化规律。结果表明:Co元素的加入能够细化晶粒,提升合金显微硬度,但弱化导电率。合金在单向拉应力作用下发生了明显的塑性变形,形成缩颈,断裂方式为韧性断裂。同时,Co元素的添加可以提高合金的弹性极限和抗拉强度,降低伸长率。在试验范围内,Cu-0.2Be-1.0Co室温拉伸性能最佳,弹性极限为291 MPa,抗拉强度为417 MPa,伸长率为30%。
The Cu-0.2Be-XCo alloy with different content of Co was prepared. The effect of Co content on the microstructure of extruded alloy was investigated. The variation of microhardness, electrical conductivity and room temperature tensile properties with the content of Co were investigated. The results show that the addition of Co element can refine the grains, enhance the microhardness of the alloy, but weaken the conductivity. Under the action of uniaxial tensile stress, the alloy underwent obvious plastic deformation and formed necking. The fracture mode was ductile fracture. At the same time, the addition of Co element can improve the elastic limit and tensile strength of the alloy, reduce the elongation. Within the experimental range, Cu-0.2Be-1.0Co has the best tensile properties at room temperature with an elastic limit of 291 MPa, a tensile strength of 417 MPa and an elongation of 30%.