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The wear and friction behavior of Pb-free Cu–Sn–Bi bearing alloys were improved by adding multi-layer graphene (MLG). An MLG/CuSn5Bi5 composite was produced by combining ball milling and conventional powder sintering. The composite exhibited increased bulk hardness and improved distribution and refinement of the Bi phase. Addition of MLG to the CuSn5Bi5 matrix resulted in a significant decrease in...
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...
Mechanical alloying has been used to form nanocomposite in an Al–20wt%Sn alloy to promote its sliding wear performance, in particular the high load-carrying capability. X-ray diffraction and scanning electron microscopy characterization reveal that the nanocomposite is a structure of nanoscaled Sn particles distributed homogeneously in nanocrystalline Al matrix with typical size of the both smaller...
Al–Sn bearing alloys with fine and homogeneous distribution of Sn dispersoids were prepared by sintering the mechanically alloyed Al–Sn powders. The microstructure evolution of the Al–20wt.%Sn alloy during sintering was examined by using X-ray diffraction, scanning electron microscopy. Two typical distributions of Sn phase can be obtained by controlling the sintering temperature. Microhardness indentation...
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...
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