表面机械研磨强化γ-TiAl合金摩擦磨损行为研究
Wear Behavior of γ-TiAl Alloys Induced by Surface Mechanical Attrition Treatment
DOI: 10.12677/MS.2018.88104, PDF,    国家自然科学基金支持
作者: 邱敬文：湖南科技大学，难加工材料高效精密加工湖南省重点实验室，湖南 湘潭；潘 迪：中南大学粉末冶金国家重点实验室，湖南 长沙；舒 逸：湖南玉丰真空科学技术有限公司，湖南 湘潭；颜建辉, 段中元, 肖祥友：湖南科技大学，材料科学与工程学院，湖南 湘潭
关键词: TiAl合金；表面机械研磨；显微组织；摩擦性能；TiAl Alloys； Surface Mechanical Attrition； Microstructure； Tribological Properties
摘要: 本文采用行星式球磨机对Ti-47Al-2Cr-0.2Mo (at.%)和Ti-45Al-7Nb-0.3W (at.%)两种TiAl合金进行了表面机械研磨处理并获得了细晶强化层。然后对表面强化处理前后的两种TiAl合金在室温空气条件下进行了往复式滑动摩擦试验。本文利用场发射扫描电子显微镜、X射线衍射仪、显微硬度测试仪和超景深三维轮廓仪等设备对两种TiAl合金表面机械研磨强化前后的样品及其摩擦磨损行为进行了对比和研究。结果表明：表面机械强化处理在两种TiAl合金表面组织中均形成了一定厚度的细晶层，其显微硬度明显高于基体材料。两种TiAl合金经表面机械强化后耐磨性能均得到一定的提升，高Nb含量的Ti-45Al-7Nb-0.3W合金表面机械强化处理后耐磨性能提高非常明显。原始态的Ti-47Al-2Cr-0.2Mo和Ti-45Al-7Nb-0.3W合金的磨损机制为二体或者三体的磨粒磨损，还有一部分的塑性变形和疲劳磨损。经过表面机械研磨强化后的两种TiAl合金的磨损机制则以磨粒磨损为主。
Abstract: Ti-47Al-2Cr-0.2Mo (at.%) and Ti-45Al-7Nb-0.3W (at.%) alloys were given Surface Mechanical At-trition Treatment (SMAT) in a planetary ballmill and obtained fine-grain layers on the surface in this paper. The reciprocating sliding wear tests were performed using original TiAl samples and as-SMATed TiAl samples in the air at the room temperature. Field emission gun scanning electron microscope, X-ray diffractometer, micro-hardness tester and 3D optical surface profiler were em-ployed to study the microstructures and wear behaviors of original samples and as-SMATed TiAl samples. It was found that fine-grain layers were produced on the surface and the microhardness of the SMATed surface on both TiAl alloys was much higher than the substrate. The wear resistance of as-SMATed TiAl alloys was also enhanced, especially the high niobium containing Ti-45Al-7Nb-0.3W alloy. The results indicate the wear mechanisms of the original TiAl samples are two-body and three-body abrasive wear, as well as fatigue wear and plastic deformation. In addition, the dominant wear mechanism of as-SMATed TiAl samples is abrasive wear.
文章引用：邱敬文, 潘迪, 舒逸, 颜建辉, 段中元, 肖祥友. 表面机械研磨强化γ-TiAl合金摩擦磨损行为研究[J]. 材料科学, 2018, 8(8): 878-889. https://doi.org/10.12677/MS.2018.88104

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