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1篇 您的检索式:作者名="Stephan LAUBE"
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1Tribological performance and microstructural evolution ofα-brass alloys as a function of zinc concentration显示文摘Tailoring a material's properties for low friction and little wear in a strategic fashion is a long-standing goal of materials tribology.Plastic deformation plays a major role when metals are employed in a sliding contact;therefore,the effects of stacking fault energy and mode of dislocation glide need to be elucidated.Here,we investigated how a decrease in the stacking fault energy affects friction,wear,and the ensuing sub-surface microstructure evolution.Brass samples with increasing zinc concentrations of 5,15,and 36 wt%were tested in non-lubricated sphere-on-plate contacts with a reciprocating linear tribometer against Si3N4 spheres.Increasing the sliding distance from 0.5(single trace)to 5,000 reciprocating cycles covered different stages in the lifetime of a sliding contact.Comparing the results among the three alloys revealed a profound effect of the zinc concentration on the tribological behavior.CuZn15 and CuZn36 showed similar friction and wear results,whereas CuZn5 had a roughly 60%higher friction coefficient(COF)than the other two alloys.CuZn15 and CuZn36 had a much smaller wear rate than CuZn5.Wavy dislocation motion in CuZn5 and CuZn15 allowed for dislocation self-organization into a horizontal line about 150 nm beneath the contact after a single trace of the sphere.This feature was absent in CuZn36 where owing to planar dislocation slip band-like features under a 45°angle to the surface were identified.These results hold the promise to help guide the future development of alloys tailored for specific tribological applications.Zhilong LIU Philipp MESSER-HANNEMANN Stephan LAUBE Christian GREINER 2020Friction2020,8,6:1
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