Studying the Thermal Stability of Cast and Microcrystalline Alloys Al–2.5Mg–Sc–Zr

The work presents the results of studies of the structure and microhardness during annealing of cast and microcrystalline (MC) Al–2.5%Mg–Sc–Zr alloys with a total Sc and Zr content of 0.32%. The Sc content varies from 0.1 to 0.22% with an interval of 0.02%, and the Zr concentration in the alloy chan...

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Bibliographic Details
Published in:Surface investigation, x-ray, synchrotron and neutron techniques x-ray, synchrotron and neutron techniques, 2022-02, Vol.16 (1), p.18-22
Main Authors: Nokhrin, A. V., Shadrina, I. S., Chuvil’deev, V. N., Kopylov, V. I., Bobrov, A. A., Likhnitskii, K. V.
Format: Article
Language:English
Subjects:
Aluminum
Casting alloys
Chemistry and Materials Science
Equal channel angular pressing
Macrostructure
Magnesium
Materials Science
Microhardness
Recrystallization
Scandium
Solid solutions
Surfaces and Interfaces
Temperature
Thermal stability
Thin Films
Zirconium base alloys
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Summary:The work presents the results of studies of the structure and microhardness during annealing of cast and microcrystalline (MC) Al–2.5%Mg–Sc–Zr alloys with a total Sc and Zr content of 0.32%. The Sc content varies from 0.1 to 0.22% with an interval of 0.02%, and the Zr concentration in the alloy changes proportionally. In the initial state, the cast alloys are characterized by a homogeneous coarse-grained macrostructure. MC alloys are obtained by equal-channel angular pressing (ECAP) and have a homogeneous fine-grained structure in the initial state. The temperature of the beginning of recrystallization of MC alloys is determined. The mechanisms and temperature of the beginning of solid-solution decomposition in the cast and MC alloys are determined according to the Johnson–Mehl–Avrami–Kolmogorov model. It is found that the partial replacement of scandium with zirconium leads to a steady increase in the thermal stability of solid solution of Sc and Zr in aluminum.
ISSN:1027-4510
1819-7094
DOI:10.1134/S1027451022010116