Electrometallurgy Today, 2022, №01



2022 №01 (01)

DOI of Article 10.37434/sem2022.01.02

2022 №01 (03)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2022, #1, 16-23 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 NAS of Ukraine. 11 Kazymyr Malevych Str., Kyiv, 03150, Ukraine. E-mail: office@paton.kiev.ua

Abstract
At heating of multilayer Al/Ni foil the component interdiffusion is accompanied by phase transformations, which can be occur by a two-channel multistage or single-channel single-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 Al thickness less than 10…12 nm, the layers of 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. Ref. 15, Table 1, Fig. 8.
Keywords: multilayer foils; electron beam deposition; phase transformations; intermetallics; SHS reaction

Received 24.11.2021

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