Abstract
Experimental antifriction aluminum alloys based on an Al–5% Si–4% Cu system with the addition of low-melting components such as Bi, Pb, In, and Cd have been studied. An optimal heat treatment mode has been adjusted, including the hardening at a temperature of 500°С with further aging at 175°С. The tribological testing have been carried out according to a pad–roller scheme (Steel 45 as the material under study) at a pressure of 0.5, 1.0, and 2.0 MPa to simulate the operation of a bearing mount assembly. It is shown that all the experimental alloys have similar tribological properties, but their mechanical characteristics, in particular, hardness, are different. Of greatest importance is an alloy containing cadmium. Using electron microscopy, the topography is studied and the elemental composition is determined for the surfaces of a roller and a pad made of this material before and after tribological testing. A process of active mass transfer in the contact zone under friction is revealed. In this case, the formation of a film consisting of secondary structures on the roller is observed. The film has the following features: an uneven distribution on the surface with a developed relief and a maximum film thickness reaching 200 μm. It is shown that, under the friction conditions that are used, such a film promotes the formation of scuffing. It has been found that the scuffing occurs after testing at a pressure higher than 1 MPa for all the studied experimental alloys. The nanoindentation of a pad performed at a load ranging from 10 to 100 mN has shown an increase in the hardness of a surface layer about 30 μm thick. This could be connected with the hardening of the material owing to plastic deformations in the friction zone.
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REFERENCES
Goryacheva, I.G., Kurbatkin, I.I., and Bushe, N.A., Modeling of secondary structure film formation processes and study of its properties, Zavod. Lab.,Diagn. Mater., 2008, vol. 74, no. 4, pp. 51–58.
Kurbatkin, I.I. and Muravyeva, T.I., The processes of formation of secondary structures and their influence on the tribological properties of sliding bearings, Trenie Smazka Mash. Mekh., 2012, no. 1, pp. 38–44.
Mironov, A., Podrabinnik, P., and Kuznetsov, E., Secondary structures as self-organization processes and finishing treatment of friction surfaces of slide bearings and shafts, Mater. Today: Proc., 2019, vol. 11, pt. 1, pp. 197–202.
Gongjun Cui, Qinling Bia, Shengyu Zhua, Jun Yanga, and Weimin Liu, Tribological behavior of Cu–6Sn–6Zn–3Pb under sea water, distilled water and dry-sliding conditions, Tribol. Int., 2012, vol. 55, pp. 126–134.
Singh, J.B., Cai, W., and Bellon, P., Dry sliding of Cu–15 wt % Ni–8 wt % Sn bronze: wear behaviour and microstructures, Wear, 2007, vol. 263, nos. 1–6, pp. 830–841.
Straffelini, G., Maines, L., Pellizzari, M., and Scardi, P., Dry sliding wear of Cu-Be alloys, Wear, 2005, vol. 259, nos. 1-6, pp. 506–511.
Mironov, A.E., Gershman, I.S., Ovechkin, A.V., and Gershman, E.I., Comparison of scoring resistance of new antifriction aluminum alloys and tradition al antifriction bronze, J. Frict. Wear, 2015, vol. 36, no. 3, pp. 257–261.
Bushe, N.A., Mironov, A.E., and Markova, T.F., New aluminum alloy replacing traditional materials, Zheleznye Dorogi Mira, 2003, no. 11, pp. 44–47.
Sheng-cheng Zhang, Qing-lin Pan, Jie Yan, and Xing Huang, Effects of sliding velocity and normal load on tribological behavior of aged Al–Sn–Cu alloy, Trans. Nonferrous Met. Soc. China, 2016, vol. 26, no. 7, pp. 1809–1819.
Bekir Sadık Ünlüa, Hülya Durmuşa, and Selda Akgünb, Tribological and mechanical properties of Al alloyed bearings, J. Alloys Compd., 2009, vol. 487, nos. 1–2, pp. 225–230.
Kerni, L., Raina, A., and Haq, M.I.U., Performance evaluation of aluminium alloys for piston and cylinder applications, Mater. Today: Proc., 2018, vol. 5, no. 9, pt. 3, pp. 18170–18175.
Vencl, A. and Rac, A., Diesel engine crankshaft journal bearings failures: case study, Eng. Failure Anal., 2014, vol. 44, pp. 217–228.
Summera, F., Grüna, F., Offenbecherb, M., and Taylorc, S., Challenges of friction reduction of engine plain bearings – tackling the problem with novel bearing materials, Tribol. Int., 2019, vol. 131, pp. 238–250.
Haque, M.M. and Sharif, A., Study on wear properties of aluminium-silicon piston alloy, J. Mater. Proc. Technol., 2001, vol. 118, nos. 1–3, pp. 69–73.
Bertelli, F., Freitas, E.S., Cheung, N., Maria, A., Arenas, M.A., Conde, A., de Damborenea, J., and Garcia, A., Microstructure, tensile properties and wear resistance correlations on directionally solidified Al‒Sn–(Cu; Si) alloys, J. Alloys Compd., 2017, vol. 695, pp. 3621–3631.
Belov, N.A., Mikhailina, A.O., Alabin, A.N., and Stolyarova, O.O., Theoretical and experimental study of the Al–Cu–Si–Sn phase diagram in the range of aluminum alloys, Met. Sci. Heat Treat., 2016, vol. 58, nos. 3‒4, pp. 195–201.
Belov, N.A., Stolyarova, O.O., and Yakovleva, A.O., The influence of lead on the structure and phase composition of an Al–5% Si–4% Cu, Russ. Metal. (Metally), 2016, no. 3, pp. 198–206.
Yakovleva, A.O., Belov, N.A., Bazlova, T.A., and Shkalei, I.V., Effect of low-melting metals (Pb, Bi, Cd, In) on the structure, phase composition, and properties of casting Al–5% Si–4% Cu alloy, Phys. Met. Metallogr., 2018, vol. 119, no. 1, pp. 35–43.
Medvedeva, S.V., Zolotorevskii, V.S., and Yakovtseva, O.A., Elevation of mechanical properties of sand-cast copper silumins, Metalloved. Term. Obrab. Met., 2018, no. 9, pp. 8–13.
Zolotorevskii, V.S., Heat Treatment. Alloys, Moscow: MISIS, 2009, vol. 2.
Fridlyander, I.N., The laws of changing in the properties of aluminum alloys upon aging, Metalloved. Term. Obrab. Met., 2003, no. 9, pp. 8–11.
Stolyarova, O.O., Muravyeva, T.I., Zagorskiy, D.L., and Belov, N.A., Microscopic investigation of the surface of antifriction multicomponent aluminum alloys, Fiz. Mezomekh., 2016, vol. 19, no. 5, pp. 105–114.
ACKNOWLEDGMENTS
We thank A.V. Mezrin and B.Ya. Sachek for tribological testing, as well as M.M. Gubenko for the indentation.
Funding
This work was financially supported by a Russian Federation Presidential grant MK-871.2018.8 (electron microscopic studies) and as part of a state order (state registration number AAAA-A17-117021310379-5, nanoindentation).
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Translated by O. Polyakov
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Shcherbakova, O.O., Muravyeva, T.I., Zagorskiy, D.L. et al. Studies on Structural Changes in the Surface Layers of Aluminum Alloys Based on the Al–Si–Cu System under Frictional Deformation. Russ. J. Non-ferrous Metals 61, 99–107 (2020). https://doi.org/10.3103/S1067821220010149
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DOI: https://doi.org/10.3103/S1067821220010149