利用真空熔炼离心工艺浇铸了ZCuSn10Zn2FeCo合金试样棒。利用SEM、TEM分析了新型铸造合金的微观组织。结果表明：和ZCuSn10Zn2合金相比,ZCuSn10Zn2FeCo合金的抗拉强度提高到了400～450 MPa,提高了70%～90%,伸长率保持在12%以上,没有明显下降。透射电镜下,铜基体中弥散分布着数量众多的细小析出相,直径在2～20 nm之间不等,直径大于100 nm的纳米析出相数量很少。纳米尺寸的析出相对位错的钉轧和阻碍作用明显,位错塞积可见。孪晶组织中存在着高密度的位错和数量众多的纳米析出相,是合金强度提高的重要原因之一。合金的断裂形式呈韧性断裂。
ZCuSn10Zn2FeCo alloy was prepared by using vacuum melting and centrifugal casting technology.Microstructure and mechanical properties of the ZCuSn10Zn2FeCo alloy were investigated by tensile test,SEM and TEM.The results show that tensile strength of the ZCuSn10Zn2FeCo alloy is 400~450 MPa,which is increased by 70~90% compared to that of ZCuSn10Zn2 alloy,while the elongation of ZCuSn10Zn2FeCo alloy remains above 12%,without significant dropping.It is found that large amount of dispersed precipitates with the dimensions of 2~20 nm are uniformly distributed in the copper matrix,and the nanoparticle phase with dimensions more than 100 nm is rarely observed.Dislocation motion is significantly blocked by the nanosized precipitates leading to pile-up of dislocations.High density dislocations and a large number of nanoparticle precipitates in twins formed in the cast alloy are responsible for the increase of tensile strength.The fracture mechanism of ZCuSn10Zn2FeCo alloy is ductile rupture.
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