利用真窄离心铸造方法制备的ZCuSn3Zn8Pb6Ni1FeCo合金试样,经850-900℃下保温1.0-3.0h后水淬固溶处理,随后在时效处理温度450、500、550和600℃下分别保温4h,用XRD、SEM、HREM分析研究该合金时效工艺对组织性能的影响.结果表明:ZCuSn3Zn8Pb6Ni1FeCo合金以α-{Cu,sn}为基体,存在有硬脆δ-Cu10Sn3相,强化析出相主要有α-Fe、γ-Fe、CoCu2Sn、Fe3Co7、Fe4Zn9等,铅以单质形式析出;与铸态相比合金经过固溶处理后抗拉强度提高33.3%,伸长率提高55.1%;合金经500℃时效4h处理,抗拉强度与常规固溶处理相比提高了8.3%,伸长率却下降了55.1%;ZCuSn3Zn8Pb6Ni1FeCo合金中强化析出相Fe4Zn9和基体Cu形成半共格关系;α-Fe和基体Cu形成完全共格关系;ZCuSn3Zn8Pb6Ni1Feco合金经固溶处理后,共格强化效果与Orwan公式计算结果非常接近,而固溶强化、空位强化和细晶强化的贡献甚微.
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