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Nanoindentation and wear Characteristics of Al 5083/SiC_p Nanocomposites Synthesized by High Energy Ball Milling and Spark Plasma Sintering

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Journal of Materials Science & Technology 2012年第11期28卷 969-975页

作者： Sivaiah Bathula Saravanan M Ajay Dhar Metals and Alloys Group Materials Physics and Engineering Division CSIR-National Physical Laboratory

AI 5083//10 wt% SiCp nano composites have been synthesized by means of high energy ball milling followed by spark plasma sintering （SPS）. Nano composites produced via this method exhibited near-theoretical density while retaining the nano-grained features. X-ray diffraction （XRD） analysis indicated that the crystalline size of the ball milled AI 5083 matrix was observed to be～25 nm and it was coarsened up to～30 nm after SPS. Nano indentation results of nano composites demonstrated a high hardness of～280 HV with an elastic modulus of 126 GPa. wear and friction characteristics with addition of SiCp reinforcement exhibited significant improvement in terms of coefficient of friction and specific wear rate to that of nano structured AI 5083 alloy. The reduction in specific wear rate in the nanocomposite was mainly due to the change of wear mechanism from adhesive to abrasive wear with the addition of SiCp which resulted in high hardness associated with nano-grained microstructure.

关键词： Metal matrix nano composites friction/wear Mechanical properties Highresolution transmission electron microscopy Spark plasma sintering Nanoindentation

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Microstructure and Tribological Properties of Fe-Cr-B-Si-based Alloy Coating on the Surface of Scraper Conveyor Middle Trough NM450

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Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 967-972页

作者： LI Junxia ZHANG Hongyu ZHANG Hongbin YANG Xiaobing ZHANG Wei LIU Libo College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Shandong Province Key Laboratory of Mine Mechanical Engineering Shandong University of Science and TechnologyQingdao 266590China JMC Heavy Duty Vehicle Co. LtdTaiyuan 030024China

This paper aims to develop a surface modification process to improve the surface properties of the middle *** coatings were prepared by plasma cladding with Fe-Cr-B-Si-based alloy powders (Ig 6 and Ig7).The organizational structure and micro-hardness of the coatings were analyzed by laboratory *** friction and wear tests were performed to investigate the friction-wear properties of middle *** coatings have higher hardness and good friction-wear properties than the *** hardness and friction wear properties of the coating with Ig7 powder are better than those with Ig6 *** experimental results show that the surface properties of the middle trough are improved by Fe-Cr-B-Si-based alloy coating,which can improve the middle trough service *** plasma cladding can be widely used in the surface-modification of middle trough to reduce the waste of resources.

关键词： plasma cladding coating NM450 substrate alloy powders friction/wear micro-structure

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