Experimental and Numerical Atomistic Investigation of the Third Body Formation Process in Dry Tungsten/Tungsten-Carbide Tribo Couples
Experimental and Numerical Atomistic Investigation of the Third Body Formation Process in Dry Tungsten/Tungsten-Carbide Tribo Couples
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DOI：
10.1007/s11249-012-0085-7
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发表时间：
2013-04-01
影响因子：
3.2
通讯作者：
Moseler, Michael
中科院分区：
文献类型：
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作者：
Stoyanov, Pantcho;Romero, Pedro A.;Moseler, Michael
采用实验和原子模拟相结合的方法研究了钨/碳化钨滑动系统中的第三体。非原位X射线光电子能谱和聚焦离子束分析的结构和化学变化附近的表面揭示，钨对碳化钨的滑动导致W表面的塑性变形，导致晶粒细化，并形成机械混合的非晶层上的WC计数器主体。分子动力学模拟的W/WC滑动偶显示了纳米级非晶W/WC界面的形成。原子干扰事件在界面中的罕见发生导致发射到W体的位错和产生的非晶剪切带在WC计数器体中与实验后在W和WC中观察到的不同的第三体一致。
The third body in tungsten/tungsten-carbide sliding systems is studied using a combination of experiments and atomistic simulations. Ex situ X-ray photoelectron spectroscopy and focused ion beam analysis of the structural and chemical changes near the surfaces reveals that sliding of tungsten against tungsten-carbide results in plastic deformation of the W surface, leading to grain refinement, and the formation of a mechanically mixed amorphous layer on the WC counter body. Molecular dynamics simulations of W/WC sliding couples exhibit the formation of a nanoscale amorphous W/WC interface. The infrequent occurrence of atomic jamming events in the interface resulted in the emission of dislocations into the W bulk and the generation of amorphous shear bands in the WC counter body in agreement with the different third bodies observed in W and WC after the experiments.