摘要
采用喷射成形工艺制备高铝锌基合金,利用扫描电镜、金相显微镜、透射电镜及X-射线衍射等表征了合金的磨损形貌和内部组织,采用M2000摩擦试验机考察了高铝锌基合金的摩擦磨损性能.结果表明,沉积坯大部分为粗化均细的共析片层状组织,呈不均匀微观分布态,而不是通常认为的树枝晶结构.沉积过程中形成较多无规则、不均匀分布的孔洞,致密度只有60%左右;由于时效后期的四相反应α+ε→Τ′+η,合金的硬度热处理后下降.试验中,硅颗粒在合金基体中始终呈均匀分布.通过M2000摩擦试验机测试合金的摩擦磨损性能.Zn52Al40Cu2Si6合金在2000N载荷,200r/min试验条件下呈最佳耐磨性能.合金的摩擦系数随着载荷的增加而减小.
A new Zn-based alloy with high Al content was prepared by spray forming and its microstructure and phase characteristics were investigated by scanning electron microscopy （SEM）,transmission electron microscopy （TEM ） and X-ray diffraction （XRD）. It was found the alloy was consisting of Zn-Al eutectoid structure and nano-scale dispersed precipitation. Many anomalous pores were introduced into the alloy during deposition and porosity was over 10%. The best wear resistance was obtained for the heat-treated Zn-40Al-2Cu-6Si alloy under 2 000 N and 200 r/min. It was found that the friction coefficient of the alloy decreased with increasing load.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2009年第6期584-591,共8页
Tribology
基金
上海市科委资助项目(05nm05028)
