Obrabotka Metallov 2020 Vol. 22 No. 3

OBRABOTKAMETALLOV Vol. 22 No. 3 2020 93 MATERIAL SCIENCE References 1. Parchenko V.V., Matsarenko N.P., Babanin A.Ya., Khomchenko A.N. Resursosberegayushchaya tekhnologiya raskisleniya stali poroshkovoi lentoi iz otsevov alyuminievoi struzhki [Resource-saving technology for the deoxidation of steel by powder tape from screenings of aluminum chips]. Elektrometallurgiya = Electrometallurgy , 2007, no. 5, pp. 11–14. 2. Gronostajski J., Marsiniak H., Matuszak A. New methods of aluminum-alloy chips recycling. Journal of Materials Processing Technology , 2000, vol. 106, iss. 1–3, pp. 34–39. DOI: 10.1016/S0924-0136(00)00634-8. The Structure, Phase Composition and Micromechanical Properties of Briquetted Aluminum Nataliya Pugacheva 1, a, , Nikolay Babailov 1, b , Tatiana Bykova 1, c, * , Yury Loginov 2, 3, d 1 Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, 34 Komsomolskaya str., Yekaterinburg, 620049, Russian Federation 2 M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18 S. Kovalevskaya str., Yekaterinburg, 620990, Russian Federation 3 Ural Federal University named after the fi rst President of Russia B.N. Yeltsin, 19 Mira str., Yekaterinburg, 620002, Russian Federation a https://orcid.org/0000-0001-8015-8120, nat@imach.uran.ru , b https://orcid.org/0000-0002-6245-2841, n.a.babailov@urfu.ru , c https://orcid.org/0000-0002-8888-6410, tatiana_8801@mail.ru , d https://orcid.org/0000-0002-7222-2521, j.n.loginov@urfu.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 3 pp. 82–94 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.3-82-94 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 26 June 2020 Revised: 14 July 2020 Accepted: 07 August 2020 Available online: 15 September 2020 Keywords : Aluminum alloy Briquetting Composite Solid solution Intermetallic compounds X-ray microanalysis Microhardness Instrumental microindentation Funding The work was performed on the equipment of the Plastometriya TsKP IMASH UB RAS in accordance with the state task on the topic No. AAAA-A18-118020790140-5. ABSTRACT Introduction. The technology of roll briquetting is successfully used for the disposal of waste aluminum alloys for the purpose of subsequent use in metallurgical production during deoxidation and alloying of steels, in aluminothermy, for the production of non-ferrous alloys, as well as in the manufacture of welding electrodes. The received blanks are required to maintain its integrity during loading and unloading and transportation. This is ensured by the selection of effective pressing modes that ensure the minimum porosity. In addition, it is practically interesting to develop a technology for additional processing of briquettes by pressure and cutting, for example, for the formation of welding electrodes. The purpose of the work is to study the chemical and phase compositions of briquetted aluminum, to determine the nature of the distribution of microhardness and micromechanical properties over the briquette cross section. Research methods: measurement of microhardness and porosity, scanning electron microscopy and micro-X-ray spectral analysis, instrumental microindentation. Results and Discussion. It is found that briquetted aluminum is a composite material with an aluminum matrix, the fi ller is particles of oxides Al 2 O 3 , MgO, SiO 2 and graphite, which got into the material from the lubricant used when rolling the briquette in roller presses. Dispersed particles of intermetallic compounds Al 8 FeMg 4 Si 6 and Al 15 (Fe,Mn) 3 Si, which are hardening phases, are unevenly distributed in the aluminum matrix. The average density of the composite is 2160 kg / m 3 , the total porosity is no more than 20%. The central part of the briquetted cell with a hardness of 65 HV 0.1 is dense and does not contain pores. The pores are presented near the surface and have dimensions of 0.1-0.3 mm, which reduces the hardness to 30 HV 0.1. Some areas of the composite are distinguished by higher values of microhardness (up to 140 Н V 0.1) and normal modulus of elasticity, as compared to the base material, and a decrease in plasticity and creep indicators. Uneven distribution of micromechanical properties should be taken into account both when developing briquetting technology and additional pressure treatment, as well as when choosing a cutting method. For citation: Pugacheva N.B., Babailov N.A., Bykova T.M., Loginov Y.N. The structure, phase composition and micromechanical properties of briquetted aluminum. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 3, pp. 82–94. DOI: 10.17212/1994-6309-2020-22.3-82-94. (In Russian). ______ * Corresponding author Bykova Tatiana M., Ph.D. (Engineering), Scienti fi c associate Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, 34 Komsomolskaya st., 620049, Yekaterinburg, Russian Federation Tel.: 8 (343) 362-30-43, e-mail : tatiana_8801@mail.ru