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利用真空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。
ZCuSn3Zn8Pb6Ni1FeCo alloy samples prepared by vacuum centrifugal casting method were heat treated at 850-900 ° C for 1.0-3.0h and then treated by water quenching followed by aging at 450, 550, 550 and 600 ° C for 4h respectively. The samples were characterized by XRD , SEM, HREM analysis of the alloy aging process on the organizational performance. The results show that there are hard and brittle δ-Cu10Sn3 phases in the matrix of α-{Cu, Sn}, and the main precipitates are α-Fe, γ-Fe, CoCu2Sn, Fe3Co7 and Fe4Zn9. ; Compared with the as-cast alloy after solution treatment, the tensile strength increased by 33.3% and the elongation increased by 55.1%. The tensile strength of the alloy increased by 8.3% compared with that of the conventional solution treated at 500 ℃ for 4h, While the growth rate decreased by 55.1%. The strengthening precipitated phase Fe4Zn9 in ZCuSn3Zn8Pb6Ni1FeCo alloy formed a semi-coherent relationship with the matrix Cu; α-Fe formed a complete coherent relationship with the matrix Cu; after the solution treatment ZCuSn3Zn8Pb6Ni1FeCo alloy, The results of the formula are very close, but the solid solution strengthening, vacancy strengthening and fine grain strengthening contribute little.