Ni/Co质量比对Cu-Ni-Co-Si合金组织和性能的影响

Effects of Ni/Co mass ratio on microstructure and properties of Cu-Ni-Co-Si alloy

采用SEM、XRD和力学性能等测试手段研究了Ni/Co质量比对Cu-Ni-Co-Si合金组织和性能的影响,尤其是通过研究织构对Ni/Co质量比与弯曲成形性能的关系进行了分析。结果表明:较小的Ni/Co质量比能够促进合金发生回复和再结晶转变,并且可以细化铸态和峰时效态合金的晶粒。在RD方向上,Ni/Co质量比为1时合金再结晶织构的取向密度最小,主要含有R{124}〈211〉和Copper{112}〈111〉织构。在TD方向上,Ni/Co质量比为1.5时合金再结晶织构的取向密度最小,主要含有Copper{112}〈111〉、S{123}〈634〉和R{124}〈211〉织构。此外,Ni/Co质量比为1时合金具有最高的硬度、电导率和伸长率以及相对高的强度。通过理论计算发现,Ni/Co质量比为1时合金在RD方向上最容易发生塑性变形。弯折试验结果表明,Ni/Co质量比为1时合金具有最好的纵向(GW)弯曲成形性能,最小弯曲比为2.1,试验结果与计算结果一致。

In this paper,the effects of Ni/Co mass ratio on the microstructure and properties of Cu-Ni-Co-Si alloys were studied by means of SEM,XRD and mechanical property.In particular,the relationship between Ni/Co mass ratio and bending formability was analyzed by studying the texture.The results show that smaller Ni/Co mass ratio can promote the recovery and recrystallization transformation of the alloy,and can refine the grains of the as-cast and peak-aged alloys.In the RD direction,when Ni/Co mass ratio is 1,the orientation density of recrystallization texture is the smallest,mainly including R{124}〈211〉and Copper{112}〈111〉textures.In the TD direction,the orientation density of recrystallization texture is the smallest when Ni/Co mass ratio is 1.5,mainly including Copper{112}〈111〉,S{123}〈634〉and R{124}〈211〉textures.In addition,the alloy with Ni/Co mass ratio of 1 has the highest hardness,electrical conductivity and elongation and relatively high strength.Through theoretical calculation,when Ni/Co mass ratio is 1,the alloy is most likely to undergo plastic deformation in the RD direction.And the bending test results show that the alloy has the best GW bending formability when Ni/Co mass ratio is 1,and the minimum bending ratio is 2.1.The test results are consistent with the calculated results.