Authors: S.U. Khudoyberdizoda, I.N. Ganiev, S.S. Savdulloeva, J.H. Dzayloev, M.M. Saidzoda, S.Yu. Kireev, M.T. Norova

Title of the article: Kinetics of oxidation of aluminum alloy АlMg5,5Li2,1Zr0,15 type duralumin with lanthanum in solid state

Year: 2026, Issue: 2, Pages: 77-89

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

Index UDK: 669.45.018.8.24/884

DOI: 10.26730/1999-4125-2026-2-77-89

Abstract: The study of high-temperature oxidation of aluminum alloys remains highly relevant due to the increasing demands on structural materials operating under extreme conditions in modern industries such as aerospace, energy, and nanomaterials production. Understanding oxidation kinetics enables the targeted development of materials with enhanced heat resistance and prolonged service life. This work investigates the effect of lanthanum alloying on the oxidation kinetics of the AlMg5.5Li2.1Zr0.15 type duralumin alloy in the solid state. Experimental studies were carried out using high-temperature thermogravimetry under isothermal conditions at temperatures of 723, 773, and 823 K in an air atmosphere using an original continuous weighing setup. X-ray phase analysis (DRON-3M diffractometer) was used to examine the oxidation products, and metallographic methods with light microscopy were employed to assess the effect of the additive on morphology. Mathematical processing of kinetic data was performed with the construction of quadratic dependences, polynomial approximations, and oxidation isochrones. The evolution of the process rate depending on the concentration of the alloying element was analyzed. Kinetic oxidation curves were obtained, and the true oxidation rate and apparent activation energy of the process were determined. It was found that the addition of lanthanum up to 1.0 wt. % increases the oxidation rate of the alloy and reduces the apparent activation energy, which is associated with the formation of a porous multicomponent spinel-type oxide phase that facilitates oxygen diffusion. Microstructural analysis confirmed grain refinement and increased structural homogeneity upon lanthanum alloying, indicating its role as a structure modifier.

Key words: aluminum alloy АlMg5,5–Li2,1–Zr0,15 type duralumin lanthanum 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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