Authors: Zengshi Xu Jie Yao Xiaoliang Shi Wenzheng Zhai Ahmed Mohamed Mahmoud Ibrahim Yecheng Xiao Long Chen Qingshuai Zhu Ao Zhang
Publish Date: 2015/06/23
Volume: 24, Issue: 8, Pages: 2875-2884
Abstract
Many studies have shown that the excellent tribological properties of materials are primarily attributed to the formation of expected frictional layer on the worn surface This article is dedicated to explore the possible formation and acting mechanism of frictional layer of TiAl12Ag5TiB2 composite At normal load of 12 N a frictional layer that consists of wearinduced layer and plastic deformation layer is observed The soft wearinduced layer supported by the harder plastic deformation layer leads to the low friction coefficient and high wear resistance The harder plastic deformation layer is induced by repetitive tribocontact and considerable plastic deformation Its high hardness improves the wear resistance of composite and finegrained structure promotes the diffusion of lubricating phase during dry friction process The soft wearinduced layer can be divided into tribofilm and mechanically mixed layer The mechanically mixed layer that consists of Ag and TiAl Oxides can continuously be provided to the worn surface to form a tribofilm with low shearing stress junctions lowering the friction coefficientThis work was supported by the National Natural Science Foundation of China 51275370 the Nature Science Foundation of Hubei Province 2012FFB05104 the Fundamental Research Funds for the Central Universities 2014yb004 the Project for Science and Technology Plan of Wuhan City 2013010501010139 the Academic Leader Program of Wuhan City 201150530146 and the Project for Teaching and Research project of Wuhan University of Technology 2012016 The authors also wish to gratefully thank the Material Research and Testing Center of Wuhan University of Technology for their assistance
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