Preparation of wearable Al-20Pb alloy by powder milling and extrusion densification
(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.Department of Industrial Engineering, Shandong Binzhou Vocational College, Binzhou 256624, China3.School of Materials Science and Engineering, Harbin Institute of Technology Weihai Campus, Weihai 264209, China4.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: Composite powder of Al-20Pb alloy was prepared by mechanical milling. The microstructure of the powder was analyzed by electronic probe microscopy. Compaction of the powder was also performed. The results show that after ball milling for 6h, the composite powder possesses fine laminar structures, good plasticity, and it is easy to densify. By extruding the composite powder ball milled for 6h with an extrusion ratio of 4, the Al-20Pb alloy with a relative density of 97%, a porosity of 3% and fine and homogenously distributed Pb phase was obtained. The results of wear and friction test indicate that a lubricating layer with a friction coefficient of about 0.4 forms on the friction surface, and the wear model is slight oxidation wear.
Key words: Al-Pb alloys； mechanical milling； extrusion； wear