The Structure, Phase Composition and Micromechanical Properties of Briquetted Aluminum
- Authors: Pugacheva N.B.1, Babailov N.A.1, Bykova T.M.1, Loginov Y.N.1
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Affiliations:
- Issue: Vol 22, No 3 (2020)
- Pages: 82-94
- Section: MATERIAL SCIENCE
- URL: https://journal-vniispk.ru/1994-6309/article/view/301997
- DOI: https://doi.org/10.17212/1994-6309-2020-22.3-82-94
- ID: 301997
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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 filler is particles of oxides Al2O3, MgO, SiO2 and graphite, which got into the material from the lubricant used when rolling the briquette in roller presses. Dispersed particles of intermetallic compounds Al8FeMg4Si6 and Al15(Fe,Mn)3Si, which are hardening phases, are unevenly distributed in the aluminum matrix. The average density of the composite is 2160 kg / m3, 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 НV 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.
About the authors
N. B. Pugacheva
Email: nat@imach.uran.ru
D.Sc. (Engineering), Associate Professor, Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, 34 Komsomolskaya str., Yekaterinburg, 620049, Russian Federation , nat@imach.uran.ru
N. A. Babailov
Email: n.a.babailov@urfu.ru
Ph.D. (Engineering), Associate Professor, Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, 34 Komsomolskaya str., Yekaterinburg, 620049, Russian Federation , n.a.babailov@urfu.ru
T. M. Bykova
Email: tatiana_8801@mail.ru
Ph.D. (Engineering), Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, 34 Komsomolskaya str., Yekaterinburg, 620049, Russian Federation , tatiana_8801@mail.ru
Y. N. Loginov
Email: j.n.loginov@urfu.ru
D.Sc. (Engineering), Professor, 1. M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18 S. Kovalevskaya str., Yekaterinburg, 620990, Russian Federation; 2. Ural Federal University named after the first President of Russia B.N. Yeltsin, 19 Mira str., Yekaterinburg, 620002, Russian Federation, j.n.loginov@urfu.ru
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