Obrabotka Metallov 2014 No. 3

ОБРАБОТКА МЕТАЛЛОВ № 3 (64) 2014 43 МАТЕРИАЛОВЕДЕНИЕ формирования алюминиевых сплавов при регуляр- ных нагружениях // Обработка металлов (технология, оборудование, инструменты). – 2011. – № 4 (53). – С. 40–43. 12. Капустин В.И., Степанов В.М. О связи между напряжениями и деформациями при периодических нагружениях // Прикладная механика и техническая физика. – 2006. – Т. 47, № 3. – С. 92–99. 13. Пригожин И., Кондепуди Д. Современная термодинамика. От тепловых двигателей до дисси- пативных структур. – М.: Мир, 2002. – 461 с. OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 3(64), July – September 2014, Pages 37–44 About the influence of ceramic coatings on the stress-strain characteristics of the alloy Д16АТ (Al-Cu-Mg) Zakharchenko K.V. 1 , Post-graduate Student, e-mail: Zaharchenkok@mail.ru Kapustin V.I. 1 , Ph.D. (Engineering), Associate Professor, e-mail: Fatigue.nstu@mail.ru Larichkin A.Yu. 2 , Ph.D. (Physics and Mathematics), Scientific associate, e-mail: larichking@gmail.com 1 Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation 2 Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the RAS, 15 Ac. Lavrentieva ave., Novosibirsk, 630090, Russian Federation Abstract Nowadays the most part of the machine elements is subjected to different technological effects on the stage of production. These effects are intended to improve the operational characteristics of the machine elements. One of such effect is the formation of the ceramic coating on the product surface. Ceramic coating has very high wear resistance, low coefficient of friction, but its operational characteristics in conditions when the sample with coating is subjected to loading with variable sign are unknown. The method of investigation of relationships of inelastic deformation of the samples with nonhomogeneous structure of metal alloy Д16АТ in conditions of periodic loading are suggested in the paper. The research methodology includes a step-stress test in the cycle, and registration of the effects of non-equilibrium strain. The study represents the comparative analysis of samples with removed and modified surface layer. Layer is modified by micro-arc oxidation (MAO) and removed by chemical etching in alkaline sodium hydroxide solution (15% NaOH). It is proved that the samples with coating demonstrate higher stress under which irreversible phenomena occur in comparison with the samples with removed surface layer. It is shown that the stress at which there are irreversible phenomena in coated specimens is 20% higher than that of the samples with a removed surface layer. Keywords: surface layer, micro-arc oxidation, elastic-plastic strain, fatigue resistance. References 1. Panin V.E., Egorushkin V.E. Deformiruemoe tverdoe telo kak nelineinoe ierarkhicheski organizovannaya sistema [Deformable solid as a nonlinear hierarchically organized system]. Fizicheskaya mezomekhanika – Physical Mesomechanics , 2011, vol. 14, no. 3, pp. 7-26 (in Russian). 2. Tushinskii L.I., Plokhov A.V., Stolbov A.A., Sindeev V.I. Konstruktivnaya prochnost’ kompozitsii osnovnoi metall-pokrytie [Constructive strength of basic metal-coating composition]. Novosibirsk, Nauka Publ., 1996. 296 p. 3. Lakhtin Yu.M., Leont’eva V.P. Materialovedenie [Materials Science]. Moscow, Mashinostroenie Publ., 1990. 528 p. 4. Wenbin Xue, Zhiwei Deng, Ruyi Chen, Tonghe Zhang, Hui Ma. Microstructure and properties of ceramic coatings produced on 2024 aluminum alloy by microarc oxidation. Journal of Materials Science, 2001, vol. 36, iss. 11, pp. 2615-2619. doi: 10.1023/A:1017988024099