Abstract
Eutectic aluminum-silicon alloys present high frictional coefficient and a high wear rate due to the low hardness under sliding friction conditions. In this paper, the eutectic aluminum-silicon alloy was textured firstly by micro-milling operations. Then, the micro-textured specimen was subjected to anodizing to fabricate alumina films. The surface topography, surface roughness, and bearing area ratio of micro-textured and anodizing micro-textured specimens were measured and characterized. For the anodizing micro-textured specimens, the surface roughness and superficial hardness increase compared with those for micro-textured ones. Tribological tests indicate that anodizing micro-textured samples present lower friction coefficient of 0.37 than that of flat samples of 0.43 under dry sliding conditions. However, they exhibit higher friction coefficient at 0.16 than that of flat samples of 0.13 under oil-lubricated conditions. The difference between the friction coefficient of anodizing micro-textured and flat samples under dry and oil-lubricated conditions is ascribed to the influence mechanism of surface roughness, bearing area ratio curves, and its relative parameters on the tribological performance of testing samples. The dry sliding friction coefficient has a positive correlation with bearing area ratio curves, while they present negative correlation with bearing area ratio curves under oil-lubricated conditions. The synergy method treated with micro-milling and anodizing provides an effective approach to enhance the dry sliding friction property of eutectic aluminum-silicon alloys.
Highlights
As the versatile material in automobile and military engineering, aluminum-silicon alloys are attractive for their high strength to weight ratio, excellent castability, high thermal conductivity, good wear, and corrosion resistance
The bottom topography of micro-textures after anodizing becomes rough compared with that micro-textures before anodizing
Under oil-lubricated conditions, friction coefficient has a negative correlation with the bearing area ratio curves and its relative parameters
Summary
As the versatile material in automobile and military engineering, aluminum-silicon alloys are attractive for their high strength to weight ratio, excellent castability, high thermal conductivity, good wear, and corrosion resistance. Most of the recent researches have focused on the improved surface hardness, deposition of PTFE/MoS2 particles on porous anodic aluminum oxide film, and its tribological properties under dry sliding conditions [10,25,28,29]. Zhu et al [34] investigated the influence mechanism of morphological parameters on tribological behaviors based on bearing area ratio curve They established functions correlating the dry or lubricated friction coefficient and the bearing area ratio curves. The impact of surface roughness on the friction property of eutectic aluminum-silicon alloys was investigated under dry and oil-lubricated conditions. Frictional coefficients of testing specimens were reported to investigate the effect of surface roughness on frictional properties alumina films. Surface roughness on frictional properties under dry friction and oil-lubricated conditions
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