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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 sample rods were cast by vacuum melting centrifugal process. The microstructure of the new cast alloy was analyzed by SEM and TEM. The results show that compared with ZCuSn10Zn2 alloy, the tensile strength of ZCuSn10Zn2FeCo alloy increases to 400 ~ 450 MPa, increased by 70% ~ 90%, and the elongation maintained at above 12% without obvious decrease. Under TEM, a large number of fine precipitates were dispersed in the copper matrix with diameter ranging from 2 to 20 nm. The number of nano-precipitates with diameters larger than 100 nm was very small. Nano-scale precipitation relative dislocations pinning and obstruction obvious, dislocation accumulation can be seen. Twins have high density of dislocations and a large number of nano-precipitated phase, the alloy strength is one of the important reasons. Alloy fracture form was ductile fracture.