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Surface nanostructures and tribological properties of metallic materials

Borys M. Efros 2Lev G. Korshunov 1Natalya B. Efros 2

1. Russian Academy of Sciences, Ural Division, Institute of Metal Physics, 18 S.Kovalevskaya str., GSP-170, Ekaterinburg 620219, Russian Federation
2. National Academy of Sciences of Ukraine, A.Galkin Donetsk Institute for Physics & Technology (DonPTI NASU), Roza Luxemburg 72, Donetsk 83114, Ukraine


With metals in sliding friction, in the surface layer (0.01-0.02 mm), ultrafine grained structures are formed, which to a considerable extent determine the tribological properties of the surfaces. The structures can be considered to be nanocrystalline structures (NCS): micro-fragments with large-angle boundaries are 5 to 100 nm in size.
The objects of investigation were the metallic materials with a wide concentration of manganese, having in initial state: BCC, HCP and FCC phases. To compare the obtaining results, the use was made of the tribological characteristics of NCS different alloys: Fe90Mn10, Fe80Mn20, Fe76Cr11Mn13, Fe60Mn40, Fe63.5Cr18Mn18N0.5, Fe68.3Cr19Mn10Si2N0.7 and Fe61.2Cr18Mn20N0.8, differing in phase composition, structure and value of the stacking fault energy. Tribological test were done at laboratory-scale plants in conditions of sliding friction for the steel-alloy and abrasive-alloy pairs.
The NCS alloys with HCP phase and NCS nitrogen-containing alloys with FCC phase possess low friction coefficients K and high abrasive wear resistance rates epsilon. In this alloys, the developed basal or planar slip characterized by a smaller quantity of the slip systems, condition the lowering of resistance NCS fragments rotation and, as a result, the improvement of tribological properties.
Thus, the essential lowering of friction coefficient K and intensity of adhesion wear Ih, as well as the increase in the abrasive wear resistance rate epsilon of NCS alloys with HCP phase and NCS nitrogen-containing alloys with FCC phase are mainly related to decreasing the quantity of slip systems in nanocrystals of these alloys (n=3). As a result, the dislocations slip to the boundaries of nanocrystals wore easier.


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Presentation: poster at E-MRS Fall Meeting 2004, Symposium I, by Borys M. Efros
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-24 08:57
Revised:   2009-06-08 12:55