王强松,王自东,范明,朱军军,张鸿

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

采用砂型铸造方法,制备了不同Fe含量的ZCuSn3Zn8Pb6Ni1FeCo合金。利用光学显微镜、拉伸测验、SEM和EDS能谱等分析测试手段,研究Fe含量对合金组织与性能的影响。结果表明:合金组织以α-{Cu,Sn,Zn}为基体,并存在硬脆相δ-Cu10Sn3,铅以单质形式析出;强化析出相主要有α-Fe和γ-Fe,以及CoCu2Sn、Fe3Co7、Fe4Zn9等;强化机制符合Orowan机制;当铁含量为1wt%时,以细小弥散颗粒状析出为主(平均直径5~15nm),抗拉强度和伸长率分别为350MPa和12.5%;随着铁含量的增加,除细小弥散析出外,较大颗粒状和粗大颗粒析出数量增多,析出物平均直径增大,综合力学性能指标大幅下降;当铁含量为4wt%时,析出颗粒尺寸达到4~10μm,晶界富集粗大析出相,伸长率下降到5%。

关键词(KeyWords)： 铸造合金;ZCuSn3Zn8Pb6Ni1FeCo;强化机制

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展(973)计划(2006CB605200)

作者(Author): 王强松,王自东,范明,朱军军,张鸿

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