Ivan Panov, Boyan Dochev, Valentin Manolov, Angel Velikov, Vanya Dyakova

Last modified: 10.05.2021


The structure of hypereutectic aluminum-silicon alloys consists of primary silicon crystals arranged in a eutectic matrix. In the present work the influence of different types of modifiers on the size and shape of the silicon crystals in the composition of the eutectic of the AlSi18 alloy has been studied. The classic for this type of alloys modifier (phosphorus), as well as the nanomodifiers SiC and nanodiamonds (ND) have been used. The results of the microstructural analysis show that the three modifiers used affect differently the shape and size of the eutectic silicon of the investigated alloy.


hypereutectic aluminum-silicon alloy, modification, nanomodifiers, eutectic silicon


G.B Stroganov, B.A.Rotenberg, G.B.Gershman, Alloys of

aluminum with silicon, M., Metallurgy, 1977 (In Russian);

V. Manolov, A.Cherepanov, R. Lazarova and S. Konstantinova, March, 22-25, 2011, Properties of the aluminium alloy AlSi7Mg, modified by refractory nanopowders, Interaction of highly concentrated energy flows with materials in promising technologies and medicine, IVth all-Russan conference, Novosibirsk, 186-190, ISBN 9785-93089-034-1

R. Lazarova, N. Bojanova, R. Dimitrova, I. Panov and V. Manolov, Influence of Nanoparticles Introducing in the Melt of Aluminum Alloys on Castings Microstructure and Properties,

V. Manolov, A. Cherepanov, R. Lazarova, and S. Konstantinova, Influence of nanopowder inoculars on the structure and the properties of the AlSi7Mg alloy, Foundry, М., № 11, 11-14, ISSN: 0024-449X, IF 0,088

R. Lazarova, V. Gaidarova, V. Manolov, M. Manchev, S. Konstantinova, A. Cherepanov, Investigation of the influence of modifying nanopowders on the characteristics of metal alloys. - Proceedings of the VII International Scientific-Technical Congress “Machines, Technologies, Materials” - MTM’2010, Sofia, Bulgaria, May 2010,  48-53.

V N Gaidarova, R L Lazarova, S V Vaseva, V K Manolov, and S G Konstantinova, June 2010, Microstructure and Mechanical Properties of AlSi7Mg Alloy: Effect of Added Nanodiamond, In: Explosive Production of New Materials: Science, Technology, Business, and Innovations. Edited by A.A. Deribas and Yu.B. Scheck, Moscow, TORUS PRESS, ISBN 978-5-94588-073-3, p. 25 (Proceedings of the X International Symposium EPNM-2010 Bechichi, Montenegro)

S. Iman El-Mahallawi, Ahmed Yehia Shash  and Amer Eid Amer, Metals 2015, 5(2), 802-821; Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles, doi:10.3390/met5020802

Hongseok Choi, Hiromi Konishi, Xiaochun Li. Al2O3 nanoparticles induced simultaneous refinement and modification of primary and eutectic Si particles in hypereutectic Al–20Si alloy. Materials Science and Engineering  A 541 (2012) 159– 165 (Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA)

El-Mahallawi, H.Abdelkader, L.Yousef, A.Amer, J.Mayer, A.Schwedt Influence of Al2O3 nano-dispersions on microstructure features and mechanical properties of cast and T6 heat-treated AlSi hypoeutectic Alloys. Materials Science&Engineering A 556 (2012) 76–87.

K.. Borodianskiy, A. Kossenko, M. Zinigrad, Improvement of the mechanical properties of Al-Si alloys by TiC nanoparticles, Metallurgical and Materials Transactions A, Nov. 2013, Vol.44, Iss.11, pp 4948-4953.