制备了不同Co含量的Cu-O.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-O.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％.
Cu-0.2Be-XCo alloys containing different contents of Co element were prepared by casting process.Microstructure transformation of as-extruded alloy with different Co contents was analyzed.Meanwhile,the effects of Co content on microhardness,electrical conductivity and tensile properties at room temperature of as-extruded alloy were studied.The results show that,the addition of Co element leads to increase of microhardness and decrease of electrical conductivity of the as-extruded alloy.The microstructure of the alloy is effectively refined by adding the Co element.Under uniaxial tensile stress,obvious plastic deformation occurs in Cu-0.2Be-XCo alloy,which forms the necking,and the fracture mode is ductile fracture.At the same time,the addition of Co can not only improve the elastic limit and tensile strength of the alloy but also decrease the elongation of the alloy.In the experimental range,Cu0.2Be-1.0Co alloy has the excellent mechanical properties,with the elastic limit of 291 MPa,the tensile strength of 417 MPa and the elongation of 30％.
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