DOI: 10.18503/1995-2732-2025-23-3-97-105
Abstract
The Relevance of this Work. The use of combined modification of the Al-15%Si alloy by methods of external energy influences makes it possible to locally strengthen the surface layer of parts and assemblies made of aluminum alloys. Objectives. It lies in identifying patterns of changes in the phase composition and structure of a high-silicon silumin alloy subjected to a combined modification depending on the depth of the modified layer. Methods Applied. Surface modification of the Al-15%Si alloy was performed, which consisted in combining electro-explosive alloying of the sample surface with Y2O3 powder (EVU 60/10 unit) and electron beam irradiation of the samples modified by the electro-explosive method (SOLO unit, with the following irradiation parameters: accelerated electron energy 18 keV, electron beam energy density ES = 35 J/cm2 with a pulse duration of 150 microseconds, the number of pulses is 3, the pulse repetition rate is 0.3 s-1, the pressure of the working gas (argon) in the working chamber is 0.02 Pa). Originality. It lies in the development of a unique method for modifying the Al-15%Si alloy, which consists in combined processing and improves its wear resistance and performance properties compared to the material in its original state. Result. As a result of X-ray phase analysis, it was found that the modified surface is characterized by a multiphase structure of the surface layer. At a distance of 25 microns from the surface, a grain structure formed by aluminum and titanium atoms was revealed, and at a depth of 65 microns, a lamellar eutectic structure was found in which aluminum-based plates of solid solution alternate with silicon plates. According to the results of microelectronogram indexing and dark-field analysis of foils obtained on the surface of the sample, particles in the form of needles or plates representing the elemental composition Ti4Al43Y6, as well as aluminum, titanium, and yttrium oxides were identified, and particles of the oxide phase with the composition TiO2 and YTi2O6 were found at a distance of 25 microns from the surface layer, na-noscale (10-15 nm) particles, presumably TiO2 or YAl3, are found in the volume of grains on the dislocations. Practical Relevance. It lies in the application of this combined modification method in the production of high-strength and wear-resistant components for the aviation and automotive industries, as well as in other areas where materials with improved mechanical properties are required.
Keywords
silumin Al-15%Si, electroexplosive alloying, electron beam processing, Y2O3 powder, combined processing, phase composition, X-ray diffraction pattern, microelectron diffraction pattern
For citation
Shliarova Yu.A., Shliarov V.V., Serebryakova A.A., Zaguliaev D.V. Phase Distribution and Structural Changes of High-Silicon Silumin after Electro-Explosive Alloying and Electron Beam Treatment. Vestnik Magnitogorskogo Gosu-darstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical Universi-ty]. 2025, vol. 23, no. 3, pp. 97-105. https://doi.org/10.18503/1995-2732-2025-23-3-97-105
1. Devyatkov V.N., Koval N.N., Shchanin P.M. Production of high-current low-energy electron beams in systems with a plasma emitter. Izv. vuzov. Fizika [News of universities. Physics], 2001;44(9):36-43. (In Russ.)
2. Ivanov Yu.F., Koval N.N. Nizkoenergeticheskie el-ektronnye puchki submillisekundnoy dlitelnosti: poluchenie i nekotorye aspekty primeneniya v oblasti materialovedeniya [Low-energy electron beams of submillisecond duration: production and some aspects of application in the field of materials science]. Struktura i svoistva perspektivnyh metallicheskih materialov [Structure and properties of promising metallic materials]. Tomsk: NTL Pub-lishing House, 2007, pp. 345-382. (In Russ.)
3. Koval N.N., Ivanov Yu.F., Teresov A.D., et al. Development of an integrated technology for electron-ion-plasma engineering of the surface of materials and products. Nanoinzheneriya [Nanoengineering], 2015;(4(46)):4-13. (In Russ.)
4. Koval N.N., Ivanov Yu.F. Razrabotka kompleksnoy tekhnologii elektronno-ionno-plazmennogo inzhiniringa poverhnosti materialov i izdeliy [Development of a comprehensive technology for electron-ion-plasma surface engineering of materials and products]. Tomsk: NTL Publishing House, 2016, 312 p. (In Russ.)
5. Otani B. Silumin and its Structure. J. Inst. Met. 2022;36:1926.
6. Qi M., Kang Y., Qiu Q., Tang W., Li J. Microstructures, mechanical properties, and corrosion behavior of novel high-thermal-conductivity hypoeutectic Al-Si alloys prepared by rheological high pressure die-casting and high pressure die-casting. J. Alloys Compd. 2018;(15 (745)):487-502.
7. Marukovich E., Stetsenko V. The problem of modifying an aluminum-silicon eutectic alloy of silumins. Way of solutions. Litiyo i Metallurgiya. 2018:12-15.
8. Lima F. L. D. S. B., et al. Electroexplosive consolidation and heat treatment of Al-Si alloys. Journal of Materials Science. 2019;54(2):123-134.
9. Khomutov V.A., et al. Properties of high-silicon aluminum alloys processed by electron beam melt-ing. Journal of Alloys and Compounds. 2020;812.
10. Serebryakova A., Shliarova Yu.A., Shliarov V.V., Zagulyaev D.V. Surface structure of AK15 silumin subjected to combined external energy impact. Bernshteinovskie chteniya po termomekhanicheskoy obrabotke metallicheskih materialov, posvyashchennye 105-letiyu so dnya rozhdeniya Marka Lvovicha Bernshteina : sbornik tezisov nauchno-tekhnicheskogo seminara [Bernstein readings on thermomechanical processing of metallic materials dedicated to the 105th anniversary of the birth of Mark Lvovich Bernstein. Proceedings of the scientific and technical seminar]. Moscow: NUST MISIS, 2024, pp. 117. (In Russ.)
11. Romanov D.A., Budovskikh E.A., Zhmakin Y.D., Gromov V.E. Surface modification by the EVU 60/10 electroexplosive system. Steel in Translation. 2011;41(6):464-468.
12. Primig S., Theska F., Haghdadi N. Electron Microscopy Methods. Elsevier, 2020.
13. Kuo J. Electron Microscopy: Methods and Protocols. Humana Totowa, NJ, 2014.