Regular features of formation of main hardening phases in alloys 1424 of the Al – Mg – Li – Zn system and V-1461 of the Al – Cu – Li – Zn – Mg system

Abstract

Phase transformations in aluminum alloys 1424 and V-1461 are investigated. Special features of the structure of the δ′-phase in the initial stages of aging of alloy 1424 are determined with the help of x-ray diffraction analysis and transmission electron microscopy. The earlier plotted diagram of aging-induced phase transformations (AIPT) of alloy 1424 is amended. The temperature and time ranges of the existence of the phases are determined and an AIPT diagram is plotted for alloy V-1461. It is shown that the maximum strength properties of alloy V-1461 are implemented in phase domains (δ′ + θ′ + $$ {{T^{\prime}}_1} $$ + S′) and (δ′ + $$ {{T^{\prime}}_1} $$ + S′). This makes it possible to obtain various phase compositions corresponding to the required combination of properties and substantiates the use of multistage aging modes.