Ultra Mild Wear in Lubricated Tribology of an Aluminium Alloy
Ultra Mild Wear in Lubricated Tribology of an Aluminium Alloy
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铝合金润滑摩擦学中的超轻度磨损
DOI：
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发表时间：
2007
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通讯作者：
S. K. Biswas
中科院分区：
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作者：
Sarmistha Das;K. Varalakshmi;V. Jayaram;S. K. Biswas
在润滑条件下，在1-100 MPa的平均接触压力范围内，以0.2m/ s的滑动速度，使钢销的平面在共晶铝硅合金上滑动。在10 MPa和70 MPa条件下，观察到两个磨损率转变。发现在1-10 MPa范围内的磨损率非常小，并且在测量仪器分辨率内，并且对接触压力也不敏感。该状态被称为超轻度磨损。缺乏塑性流动，最小的破碎的硅颗粒，并在地下的断裂和未断裂的硅颗粒上存在未扭曲的空隙，表明在近表面区域的应力状态是弹性的。接触力学计算表明，在接触压力< 13.7 MPa时，系统很可能安定到弹性状态。
Flat faces of steel pins were slid on an eutectic aluminium silicon alloy under lubricated condition in the 1–100 MPa mean contact pressure range and 0.2 m/ s sliding speed. Two transition in wear rate were observed, at 10 MPa and 70 MPa. The wear rate in the 1–10 MPa regime was found to be very small and within the measuring instrument resolution and also insensitive to contact pressure. The regime is designated ultramild wear. Lack of plastic flow, minimal fragmentation of silicon particles, and the presence of undistorted voids on the fractured and unfractured silicon particles in the subsurface suggest that the state of stress in the near surface region is elastic. Contact mechanical calculations demonstrate that at contact pressures < 13.7 MPa, the system is likely to shakedown to an elastic state.