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A displacement sensing nanoindentation study of tribo-mechanical properties of the Ni-Co system

机译：Ni-Co体系摩擦力学性能的位移传感纳米压痕研究

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摘要

An analysis of the tribo-mechanical properties of the Ni-Co system, at the submicrometric contact scale, is conducted using displacement sensing nanoindentation. In particular, the influence of contact depth and surface finishing methods on the hardness, H, and Young's modulus, ￡, of the materials is analysed. Mechanically and electrolitically polished samples were tested with a conospherical indenter using a range of loads between 0.05 and 10 mN. It is shown that the hardness of these materials depends on the surface finishing method and increases with decreasing contact depth, while the Young's modulus is relatively insensitive to contact depth. Furthermore, sample polycrystallinity leads to a large scattering of hardness values in Co-rich samples and of Young's modulus values in Ni-rich ones. The combined parametric ratio H/E, which can be related to the tribological behaviour of the material, was found to be higher in samples with Co content larger than 80 wt.%.
机译：使用位移传感纳米压痕在亚微米接触尺度上对Ni-Co系统的摩擦机械性能进行了分析。特别是，分析了接触深度和表面处理方法对材料的硬度H和杨氏模量influence的影响。机械和电抛光的样品用一个球形压头在0.05到10 mN之间的载荷范围内进行测试。结果表明，这些材料的硬度取决于表面处理方法，并且随着接触深度的减小而增加，而杨氏模量对接触深度相对不敏感。此外，样品的多晶性导致富钴样品中硬度值和富镍样品中杨氏模量值的较大分散。发现在Co含量大于80 wt。％的样品中，组合参数比H / E可能与材料的摩擦学行为有关。

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