Investigation of the influence of heat treatment modes on the structure and properties of sheets of aluminum-lithium alloy V-1469

Antipov K.V., Oglodkova Yu.S., Kuryntsev S.V., Safiullin E.I.
UDC
621.785:669
DOI
10.18577/2307-6046-2022-0-11-16-26
Article PDF (Russian) (772.4 KB)
How to cite
Antipov K.V., Oglodkova Yu.S., Kuryntsev S.V., Safiullin E.I. Investigation of the influence of heat treatment modes on the structure and properties of sheets of aluminum-lithium alloy V-1469 // Proceedings of VIAM. 2022. No. 11. DOI: 10.18577/2307-6046-2022-0-11-16-26. URL: https://test.viam.ru/en/journal/2022/11/2
Keywords
Al–Li alloys, alloy V-1469, heat treatment, microstructure, microhardness
Abstract

The effect of heat treatment regimes for sheets 2 mm thick of aluminum-lithium alloy V-1469 on the microstructure and microhardness has been studied. Hardening and one- and two-stage artificial aging with various holding times (from 1 to 12 hours) were carried out. Using optical and scanning electron microscopes, the microstructure was studied and a local chemical analysis of the phase components of the alloy was carried out. It is shown that with an increase in the time of one-stage artificial aging, the microhardness increases from 93 to 175 HV, and with an increase in the total exposure during two-stage aging, from 91 to 180 HV, as a result of structural-phase changes and an increase in the proportion of strengthening phases. Inclusions of a regular triangular shape, found after hardening, contain up to 17 % (by mass) of copper and have a size of 1.5–3.0 µm.

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