Abstract
Microstructure and functional mechanism of friction layer need to be further researched. In the present work, the friction coefficients and wear rates are analyzed through response surface methodology to obtain an empirical model for the best response. Fitting results show that the tribological performance of Ni3Al matrix composites (NMCs) with graphene nanoplatelets (GNPs) is better than that of NMCs without GNPs, especially at high sliding velocities and high loads. Further research suggests that the formation of integrated friction layer, which consists of a soft microfilm on a hard coating, is the major reason to cause the differences. Of which, the wear debris layer (WDL) with a low shear strength can reduce the shear force. The ultrafine layer (UL), which is much harder and finer, can effectively avoid fracture and improve the load support capacity. Moreover, the GNPs in WDL and UL can be easily sheared and help to withstand the loads, trending to be parallel to the direction of shear force.
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Acknowledgments
This work was supported by the Key Project for Science and Technology Plan of Henan Province (152102210119) and the Project for Science and Technology Plan of Wuhan City (2013010501010139). Authors also wish to gratefully thank the Material Research and Testing Center of Wuhan University of Technology for their assistance. Authors were grateful to M.J. Yang, S.L. Zhao and W.T. Zhu in Material Research and Test Center of WUT for their kind help with EPMA and FESEM.
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Qingshuai Zhu has contributed equally to this work.
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Xue, B., Zhu, Q., Shi, X. et al. Microstructure and Functional Mechanism of Friction Layer in Ni3Al Matrix Composites with Graphene Nanoplatelets. J. of Materi Eng and Perform 25, 4126–4133 (2016). https://doi.org/10.1007/s11665-016-2264-4
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DOI: https://doi.org/10.1007/s11665-016-2264-4