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In this work, an attempt was made to further promote the wear and friction behavior of dual-scale structured Al–12wt% Sn bearing alloys by coupling with a nano-Si@Sn composite. A so-called tri-modal Al–Sn–Si (denoted as CG-30 Si-containing alloy), which exhibited increased bulk hardness and improved distribution and refinement of the Sn phase, was produced by combining mechanical alloying and conventional...
A mechanism for significant improvement of wear properties has been investigated. This operates by inducing a dual-scale structure consisting of coarse-grains (CG) and ultrafine-grains (UFG) in Al–12wt%Sn alloys, in comparison with uniform UFG or CG structured alloys. It has been found that a dynamic steady tribolayer consisting of fine crystalline oxides plays a dominant role in improving the wear...
We present in this work evidence that significant improvement of wear behavior can be achieved by creating a dual-scale structure. An Al–12wt%Sn bearing alloy consisting of mixtures of nanocrystalline (NC) Al–Sn powder and coarse-grained (CG) Al–Sn powder was produced by a combination of mechanical alloying and conventional powder sintering. The extent of the improvement in wear properties was related...
In this paper a parallel molecular dynamics (MD) model has been developed to investigate the nanoscratch process of single crystal iron. The simulations were performed for two cases with different crystallographic orientations and scratch directions. In Case I the scratch plane is (100) and the scratch direction is [001]. In Case II the scratch plane and the scratch direction are (1,−1,2) and [111],...
Thin films of Ni and Ni alloy have been widely used in microelectromechanical systems (MEMS) and magnetic storage systems. As the dimensions of components in these systems decrease to the micro-scale, even the nano-scale, the interfacial phenomena significantly differ to the counterparts on the macro-scale. A better understanding of micro-/nano-tribology will benefit the fabrication of the small components...
Wear behaviors of Ag/Cu multilayers were evaluated and compared using nanoscratch techniques under a ramping load. Scratch grooves were examined using scanning electron microscopy (SEM) and in situ cross-section scan. It was found that the friction coefficients for all samples have significant difference and the wear resistance is not linearly proportional to the hardness. These discrepancies were...
In the present work, Al-10wt.% Pb-xwt.% Cu (x=0-5.5) powder mixtures were mechanically alloyed. Then the mechanically alloyed powders were sintered to fabricate bulk alloys. Scanning electron microscope, X-ray diffractometer and Vickers hardness indentation were used to characterize the microstructure and mechanical properties of the Al-10wt.% Pb-xwt.% Cu alloys. Wear properties of the alloys were...
In the present work, the effect of mechanical alloying (MA) on the improvement of wear properties of Al-Pb binary alloys is reported. The alloys with Pb ranging from 10 to 18 wt.% were prepared by vacuum sintering mechanically alloyed Al-Pb powder. Optical microscope (OM), scanning electron microscope, X-ray diffractometer and Vickers hardness indentation were used to characterize the microstructure...
The tribological behavior of ceramic Al 2 O 3 coupled with gray cast iron (PHT) with different lubricants was investigated using a ring-on-block wear tester. In the wear test, air, distilled water, emulsion and oil were used as lubricants respectively in order to check the lubricating effectiveness of lubricants and the friction mechanism of solid graphite in the cast iron. Wear testing...
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