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Tribological characteristics of metallic glass in sliding contact: Experimental investigations and molecular dynamics simulations.

机译：滑动接触金属玻璃的摩擦学特性：实验研究和分子动力学模拟。

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摘要

The unlubricated sliding characteristics of zirconium-based bulk metallic glass disks have been examined in vacuum and in air using sliders made from the same material or from a hard bearing steel (52100). The pin-on-disk test system allowed collection of debris, monitoring of the friction force and, using a Kelvin probe, in situ detection of changes in the structure and chemical composition of the disk surface. Friction coefficient and wear rate of metallic glass were found to vary with normal load, sliding velocity and test environment. Post-test characterization included microhardness testing, X-ray diffraction, SEM and EDS. Examination of worn surfaces, cross-sections and debris confirmed the importance of plastic deformation, material transfer and environmental interactions. When devitrified material was tested, sliding processes caused the near-surface material to re-amorphize. Results from sliding of bulk metallic glass specimens were compared with those from related experiments involving crystalline metals and alloys. Although bulk metallic glasses are reported to have only limited ductility in tensile tests, the friction coefficients and worn surfaces of these materials are typical of ductile materials.; Molecular dynamics (MD) calculations were used to simulate the sliding of a 2D 2-component amorphous system interacting via Lennard-Jones potentials. The friction coefficient showed a transient before reaching an average steady state value. The steady state friction coefficient was observed to decrease with an increasing sliding velocity. Mixing was observed at the sliding interface. The mixed layer grew at a rate that scaled with the square root of time. A density decrease was recorded in the region adjacent to the sliding interface. This spatially corresponded to the softer layer detected experimentally near the worn surface in a Zr41.2Ti13.8Cu12.5Ni 10.0Be22.5 bulk metallic glass alloy after sliding. Subsurface displacement profiles produced in these simulations were similar to those observed in other material systems. The Navier-Stokes equation was used to analyze the material flow pattern, with results in agreement with data obtained from simulations. This suggests that the observed subsurface displacement profile may be a generic material flow pattern under combined compression and shear.
机译：锆基大块金属玻璃圆盘的未润滑滑动特性已在真空和空气中使用由相同材料或硬轴承钢（52100）制成的滑块进行了检查。针盘式测试系统允许收集碎屑，监测摩擦力，并使用开尔文探针，就地检测磁盘表面结构和化学成分的变化。发现金属玻璃的摩擦系数和磨损率随正常载荷，滑动速度和测试环境而变化。测试后的表征包括显微硬度测试，X射线衍射，SEM和EDS。检查磨损的表面，横截面和碎屑证实了塑性变形，材料转移和环境相互作用的重要性。测试失透材料时，滑动过程导致近表面材料重新非晶化。将大块金属玻璃试样的滑动结果与涉及晶体金属和合金的相关实验的结果进行了比较。尽管据报道，大块金属玻璃在拉伸试验中仅具有有限的延展性，但这些材料的摩擦系数和磨损表面是延性材料的典型特征。分子动力学（MD）计算用于模拟通过Lennard-Jones势相互作用的2D 2组分非晶态系统的滑动。摩擦系数在达到平均稳态值之前显示出瞬态。观察到稳态摩擦系数随着滑动速度的增加而减小。在滑动界面处观察到混合。混合层以与时间的平方根成比例的速度增长。在与滑动界面相邻的区域中记录了密度降低。这在空间上对应于在Zr 41.2 Ti 13.8 Cu 12.5 Ni 10.0 Be 22.5 块状金属玻璃合金。在这些模拟中产生的地下位移轮廓与在其他材料系统中观察到的相似。 Navier-Stokes方程用于分析物料流型，其结果与从模拟获得的数据一致。这表明观察到的地下位移曲线可能是压缩和剪切联合作用下的一般材料流动模式。

著录项

  • 作者

    Fu, Xi-Yong.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 186 p.
  • 总页数 186
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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