Journal
APPLIED SURFACE SCIENCE
Volume 503, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144156
Keywords
Selective laser melting (SLM); Aluminum matrix composite (AMC); Graphene; Microstructure; Wear resistance
Categories
Funding
- National Natural Science Foundation of China [51604246, 51775521]
- Natural Science Foundation of Shanxi Province [201801D221154]
- Science and Technology on Power Beam Processes Laboratory Foundation [JZX7Y201901SY008501]
- National Key Laboratory for Remanufacturing Foundation [JZX7Y201901SY00501]
- North University of China for Young Academic Leaders
- Major Science and Technology Projects of Shanxi Province, China [20181101009, 20181102012]
- International Science and Technology Cooperation Program of Shanxi Province [201603D421024]
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In order to improve the wear resistance of aluminum alloys and expand its applications, the microstructure and tribological properties of nano-graphene reinforced aluminum matrix composites-which were fabricated by selective laser melting (SLM)-were investigated. Experiments were conducted to investigate the effect of slide speeds (0.3-0.9 m/s) and normal loads (10N-30N), which demonstrated the dislocation strengthening and load strengthening resulting from the homogeneous dispersion of graphene nano-platelets (GNPs) enhance the wear resistance of GNPs/AlSi10Mg composites. With the increase of slide speed, the wear rate of composites decreases and the wear regime changes from abrasive wear to delamination wear, which is because the formation of a relatively stable mechanically mixed layer (MML) reduces the contact area between the counterbody material and the wear surface, and the nano-graphene bridges between the subsurface cracks improve the tribological performance. Meanwhile, with the increase of normal load, the predominant wear regime of the reinforced composite is the combination of delamination wear and oxidize wear. And the coefficient of friction (COF) decreases as the slide speed increases, which is because the self-lubricating property of graphene nano-platelets makes it easy to form interlayer sliding and reduce friction effectively.
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