摘要
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 were prepared by centrifugal casting process. The specimens were water quenched after heating at 850 - 900℃ for 1 - 3h, and ageing at 450,500,550 and 600℃ for 4h, respectively. The effect of heat treatment on microstructure and properties of ZCuSn3Zn8Pb6Ni1FeCo alloy was investigated by optical micaoseope, XRD, SEM, HREM and tensile tests. The results show that the microstrueture of the alloy is composed of α- { Cu, Sn } matrix, Cu10 Sn3, Pb and precipitates of α- Fe, γ- Fe, CoCu2 Sn, Fe3 Co7 and Fe4 Zn9 . Compared with cast ZCuSn3Zn8Pb6Ni1 FeCo alloy, the tensile strength and elongation of the alloy after solution treatment increase by 33.3 % and 55.1%, respectively. After aging treatment at 500℃ for 4h, the tensile strength is enhanced by 8.3 % and elongation decreases by 55.1% compared with that of solution treatment. The Fe4Zn9 and α-Fe have semi-coherent and coherent relationship to Cu, respectively. The theoretical calculations based on Orwan theory are in agreement with the experiment results, and no significant strengthening of solustion, vacancy and grain refinement are observed.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第2期110-114,137,共6页
Transactions of Materials and Heat Treatment
基金
国家重点基础研究发展计划(973)资助项目(2006CB-605200)
