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Article

Complex Structure Modification and Improvement of Properties of Aluminium Casting Alloys with Various Silicon Content

1
Moscow Aviation Institute, Orshanskaya 3, 125993 Moscow, Russia
2
Institute of Electrophysics, Ural Branch, Russian Academy of Science, Amudsena str., 106, 620016 Yekaterinburg, Russia
3
Institute of New Materials and Nanotechnology, National University of Science and Technology “MISIS”, Leninskii Prosp, 4, 119049 Moscow, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Wenming Jiang
Metals 2021, 11(12), 1946; https://doi.org/10.3390/met11121946
Received: 15 October 2021 / Revised: 28 November 2021 / Accepted: 29 November 2021 / Published: 1 December 2021
(This article belongs to the Special Issue Casting and Forming of Light Alloys)
The possibility of using complex structure modification for aluminium casting alloys’ mechanical properties improvement was studied. The fluxes widely used in the industry are mainly intended for the modification of a single structural component of Al–Si alloys, which does not allow unifying of the modification process in a production environment. Thus, a new modifying flux that has a complex effect on the structure of Al–Si alloys has been developed. It consists of the following components: TiO2, containing a primary α-Al grain size modifier; BaF2 containing a eutectic silicon modifier; KF used to transform titanium and barium into the melt. The effect of the complex titanium dioxide-based modifier on the macro-, microstructure and the mechanical properties of industrial aluminium–silicon casting alloys containing 5%, 6%, 9%, 11% and 17% Si by weight was studied. It was found that the tensile strength (σB) of Al–Si alloys exceeds the similar characteristics for the alloys modified using the standard sodium-containing flux to 32%, and the relative elongation (δ) increases to 54%. The alloys’ mechanical properties improvement was shown to be the result of the flux component’s complex effect on the macro- and microstructure. The effect includes the simultaneous reduction in secondary dendritic arm spacing due to titanium, the refinement and decreasing size of silicon particles in the eutectic with barium and potassium, and the modifying of the primary silicon. The reliability of the studies was confirmed using up-to-date test systems, a significant amount of experimental data and the repeatability of the results for a large number of samples in the identical initial state. View Full-Text
Keywords: aluminium casting alloys; complex structure modification; titanium; barium; titanium dioxide; mechanical properties; microstructure; macrostructure aluminium casting alloys; complex structure modification; titanium; barium; titanium dioxide; mechanical properties; microstructure; macrostructure
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MDPI and ACS Style

Shlyaptseva, A.D.; Petrov, I.A.; Ryakhovsky, A.P.; Medvedeva, E.V.; Tcherdyntsev, V.V. Complex Structure Modification and Improvement of Properties of Aluminium Casting Alloys with Various Silicon Content. Metals 2021, 11, 1946. https://doi.org/10.3390/met11121946

AMA Style

Shlyaptseva AD, Petrov IA, Ryakhovsky AP, Medvedeva EV, Tcherdyntsev VV. Complex Structure Modification and Improvement of Properties of Aluminium Casting Alloys with Various Silicon Content. Metals. 2021; 11(12):1946. https://doi.org/10.3390/met11121946

Chicago/Turabian Style

Shlyaptseva, Anastasiya D., Igor A. Petrov, Alexandr P. Ryakhovsky, Elena V. Medvedeva, and Victor V. Tcherdyntsev. 2021. "Complex Structure Modification and Improvement of Properties of Aluminium Casting Alloys with Various Silicon Content" Metals 11, no. 12: 1946. https://doi.org/10.3390/met11121946

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