The tribological characteristics of hypereutectic Al 17Si x La alloys against heat treated GCr15 bearing steel under unlubricated conditions were investigated using a block on ring type wear testing apparatus in air a...The tribological characteristics of hypereutectic Al 17Si x La alloys against heat treated GCr15 bearing steel under unlubricated conditions were investigated using a block on ring type wear testing apparatus in air at room temperature. Microstructures and chemical compositions of worn surface and wear debris were characterized by means of SEM with EDS and XRD patterns. XRD results show that wear behaviors of Al 17Si x La alloys are similar and the typical worn surface is characterized by smooth region and crater region. The mechanically mixed layer (MML) and the wear debris are very similar in microstructures and chemical compositions, both containing the fine equiaxed aggregates and large plates and blocks from the both sliding counterparts ( α (Al) and α Fe) and some reaction products (ternary oxides, i.e. Al Fe O and Fe Si O).展开更多
采用熔炼铸造和塑性变形方法制备Mg-Al-Pb-La镁合金。采用扫描电镜和X射线衍射等方法研究轧制对Mg-Al-Pb-La镁合金显微组织的影响,采用动电位极化和恒电流放电等方法研究轧制对Mg-Al-Pb-La镁合金腐蚀电化学行为的影响。结果表明:轧制使M...采用熔炼铸造和塑性变形方法制备Mg-Al-Pb-La镁合金。采用扫描电镜和X射线衍射等方法研究轧制对Mg-Al-Pb-La镁合金显微组织的影响,采用动电位极化和恒电流放电等方法研究轧制对Mg-Al-Pb-La镁合金腐蚀电化学行为的影响。结果表明:轧制使Mg-Al-Pb-La镁合金的晶粒细化、第二相破碎、再结晶程度降低、Mg-Al-Pb-La镁合金的放电活性增强、耐蚀性变差和阳极效率降低;当轧制变形量为40%时,镁合金的综合放电性能优良,在电流密度180 m A/cm^2下平均放电电位和阳极效率分别为-1.749 V(vs SCE)和(82.9±0.2)%。展开更多
文摘The tribological characteristics of hypereutectic Al 17Si x La alloys against heat treated GCr15 bearing steel under unlubricated conditions were investigated using a block on ring type wear testing apparatus in air at room temperature. Microstructures and chemical compositions of worn surface and wear debris were characterized by means of SEM with EDS and XRD patterns. XRD results show that wear behaviors of Al 17Si x La alloys are similar and the typical worn surface is characterized by smooth region and crater region. The mechanically mixed layer (MML) and the wear debris are very similar in microstructures and chemical compositions, both containing the fine equiaxed aggregates and large plates and blocks from the both sliding counterparts ( α (Al) and α Fe) and some reaction products (ternary oxides, i.e. Al Fe O and Fe Si O).
文摘采用熔炼铸造和塑性变形方法制备Mg-Al-Pb-La镁合金。采用扫描电镜和X射线衍射等方法研究轧制对Mg-Al-Pb-La镁合金显微组织的影响,采用动电位极化和恒电流放电等方法研究轧制对Mg-Al-Pb-La镁合金腐蚀电化学行为的影响。结果表明:轧制使Mg-Al-Pb-La镁合金的晶粒细化、第二相破碎、再结晶程度降低、Mg-Al-Pb-La镁合金的放电活性增强、耐蚀性变差和阳极效率降低;当轧制变形量为40%时,镁合金的综合放电性能优良,在电流密度180 m A/cm^2下平均放电电位和阳极效率分别为-1.749 V(vs SCE)和(82.9±0.2)%。
