Authors: U.Sh. Yakubov, I.N. Ganiev, A.G. Safarov

Title of the article: Kinetics of oxidation of an aluminum alloy AlFe5Si10 modified with lead

Year: 2026, Issue: 2, Pages: 90-100

Branch of knowledge: 2.6.1 Metal science and heat treatment of metals and alloys

Index UDK: 669.45.018.8.24/884

DOI: 10.26730/1999-4125-2026-2-90-100

Abstract: It is known that commercial-grade aluminum with an increased content of iron, silicon, and other impurities cannot be widely used in industry due to its low service properties. Therefore, the development of new alloy compositions based on such metal is a highly relevant task. Among the promising alloy compositions on the aluminum–iron phase diagram are the eutectic (α-Al + Al₃Fe) and hypereutectic alloys, which, having a minimal crystallization interval, can contain up to 5 wt. % iron. An alloy of this composition was additionally alloyed with 10 wt. % silicon and modified with lead. The aim of this work is to determine the effect of lead as a modifier on the kinetics of the high-temperature oxidation process of the AlFe5Si10 aluminum alloy in the solid state. To achieve the stated objective, the results of a study on the oxidation kinetics of a lead-modified aluminum alloy AlFe5Si10 (Al + 5 wt. % Fe + 10 wt. % Si) in the solid state were analyzed. The experiments were carried out using the thermogravimetric method in air at atmospheric pressure within the temperature range of 773-873 K. It was established that the oxidation process over the entire investigated temperature range is described with high accuracy by a fourth-degree polynomial. During the experiments, a periodic variation in the oxidation rate over time was observed. The kinetic and energetic parameters of the alloy oxidation process were determined. It was found that at temperatures of 773, 823 and 873 K, the addition of lead in concentrations up to 1.0 wt. % reduces the oxidizability of the AlFe5Si10 aluminum alloy, while the effective activation energy increases. The oxidation rates of the alloys at the investigated temperatures are on the order of 10-4 kg∙m-2. sec-1. The X-ray phase analysis method was used to study the composition of the oxidation products of AlFe5Si10 alloy samples, depending on their lead content. It was shown that the oxidation products of the alloys are: Al2O3; Al4.5FeSi; Fe3Al2(SiO4)3; Si11.96Al0.04O24; AlFeO3; Pb32(Pb4O4)8 (Al92Si100O384); PbO; Pb2O3.333; Pb3O4.

Key words: aluminum alloy AlFe5Si10 lead thermogravimetric method oxidation kinetics true oxidation rate apparent activation energy

Receiving date: 05.11.2025

Approval date: 15.05.2026

Publication date: 29.06.2026

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