【摘要】 通过硬度测试、金相显微镜(OM)、扫描电镜(SEM)、X射线衍射物相分析(XRD)、均匀腐蚀和电化学腐蚀实验以及微动摩擦实验等分析手段,研究了锆微合金化铸态镍铝青铜的硬度、组织、均匀腐蚀性能、电化学腐蚀性能和摩擦磨损性能。结果表明:与未微合金化铸态镍铝青铜(Cu-8.87Al-5.22Fe-4.48Ni-1.08Mn-0.53Zn)相比,锆微合金化铸态镍铝青铜(Cu-9.92Al-5.24Fe-4.43Ni-1.07 Mn-0.52Zn-0.045Zr)的相组成没有显著变化,都由α相、β相(高温相)和κ相(包括κI,κII,κIII和κIV)组成,但α相、κIII相和κIV相显著细化。锆微合金化铸态镍铝青铜的硬度由HV212.1提高到HV229.3,比未微合金化铸态镍铝青铜高8.1%,晶粒细化且呈弥散分布是硬度提高的主要原因。由于腐蚀优先发生在共析区域(α+κIII相)内,组织细化降低了该区域腐蚀长通道产生的概率,使得锆微合金化铸态镍铝青铜在3.5%NaCl水溶液中的均匀腐蚀速率和电化学腐蚀速率分别降低到0.022954754和0.26193 mm·a-1(分别降低了5.3%和8.45%);硬度提高、组织细化以及位错强化作用使得锆微合金化铸态镍铝青铜的摩擦系数降低到0.022(降低了12.7%)。更多还原

【Abstract】 The hardness,microstructures,uniform and electrochemical corrosion properties and friction /wear properties of Zr microalloying nickel aluminum bronze ingot were investigated by means of hardness measurement,optical microscopy( OM),scanning electron microscopy( SEM),X-ray diffraction( XRD),uniform and electrochemical corrosion experiments and fretting friction experiments. The results showed that,compared with the un-microalloying nickel aluminum bronze ingot( Cu-8. 87Al-5. 22Fe-4. 48Ni-1. 08Mn-0. 53Zn),the Zr microalloying nickel aluminum bronze ingot( Cu-9. 92Al-5. 24Fe-4. 43Ni-1. 07Mn-0. 52Zn-0. 045Zr) had no significant change in the phase composition,which was composed of α-phase,β-phase( high-temperature phase) and κ-phase( it comprised κI,κII,κIII and κIV),but α-phase,κIII-phase and κIV-phase were remarkably refined. The hardness of Zr microalloying nickel aluminum bronze ingot increased from HV 212. 1 to HV 229. 3,which was 8. 1% higher than un-microalloying,grain refinement and dispersive distribution were the main reason for hardness increasing. Since corrosion occurred preferentially in eutectoid region( α-phase + κIII-phase),the refinement of the eutectoid microstructure reduced the probability of the occurrence of the long corrosion channel,uniform corrosion rate and electrochemical corrosion rate of Zr microalloying nickel aluminum bronze ingot reduced to 0. 022954754 and 0. 26193 mm·a- 1( decreased by 5.3% and 8.45%,respectively); due to hardness increasing,microstructure refinement and dislocation strengthening,friction coefficient of Zr microalloying nickel aluminum bronze ingot was reduced to 0. 022( decreased by 12. 7%).更多还原