The Paton Welding Journal, 2022, №04



2022 №04 (06)

DOI of Article 10.37434/tpwj2022.04.07

2022 №04 (08)

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The Paton Welding Journal, 2022, #4, 43-50 pages

Influence of microstructure of multilayer Al/Ni foils on phase transformations initiated by heating

A.I. Ustinov, S.O. Demchenkov

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: ustinov3g@gmail.com

Abstract
At heating of multilayer Al/Ni foil the component interdiffusion is accompanied by phase transformations, which can occur by a two-channel multistage or single-channel one-stage schemes. It is shown that the type of the scheme by which the phase transformations develop in the studied multilayer foils, is related to the process of formation of a metastable Al9Ni2-phase on the layer interfaces. The work is a study of the influence of multilayer foil microstructure on formation of a metastable Al9Ni2-phase. It is found that the thickness of Al9Ni2-phase layers is determined by the thickness of aluminium layers in the initial multilayer foil. At the thickness of Al layers of 70–80 nm and greater, the thickness of Al9Ni2-phase layers practically does not change, and is equal to approximately 30–35 nm; at reduction of Al layer thickness, the thickness of Al9Ni2-phase layers decreases abruptly, and at A1 thickness less than 10–12 nm, the layers of a metastable Al9Ni2-phase do not form. The process of formation of metastable Al9Ni2-phase layers is characterized by a high rate and incubation time. Proceeding from the obtained results, a structural-kinetic diagram was proposed, which allows determination of the conditions for prevention of the multistage process of achievement of the foil equilibrium state during its heating.
Keywords: multilayer foils; electron beam deposition; phase transformations; intermetallics; SHS reaction

Received: 24.11.2021
Accepted: 30.06.2022

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Suggested Citation

A.I. Ustinov, S.O. Demchenkov (2022) Influence of microstructure of multilayer Al/Ni foils on phase transformations initiated by heating. The Paton Welding J., 04, 43-50.

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