The influence of hafnium on high-magnesium alloys doped with transition metals during heat treatment

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Abstract

The purpose of the work is to study the influence of hafnium additives on the mechanical properties and thermal stability of particles at elevated temperature during heat treatment of aluminum alloys with a high magnesium content. Two modifications of 1570 alloy were chosen for the study: without hafnium content and with its addition of 0.5 % by weight. Both alloys were subjected to homogenizing annealing at a temperature of 440 °C with different exposure modes, which ranged from 2 to 100 h. Microhardness was studied for various heat treatment modes, and the fine microstructure was studied as well using transmission microscopy. As a result, it was possible to identify that during annealing at a short exposure time (2–8 h), the alloy with the hafnium addition has higher microhardness values exceeding those of 1570 alloy by an average of 20 HV units. This is associated with the fact that in 1570 alloy with hafnium additives, during heat treatment, the number of precipitated particles increases while their average size decreases compared to the base alloy. At the same time, in 1570 alloy without hafnium content, when annealed at a temperature of 440 °C, there is no increase in microhardness. This is caused by the fact that in 1570 alloy without hafnium content, when cooled after casting, discontinuous decomposition occurs, which resulted in the fact that most of the scandium precipitates from the supersaturated solid solution in the form of dispersoids. This phenomenon is not observed in the alloy with hafnium additives, which indicates its ability to stop discontinuous decomposition during cooling the ingot after casting.

About the authors

Igor A. Zorin

Samara National Research University;
Siberian State Industrial University

Author for correspondence.
Email: zorin.ia@ssau.ru
ORCID iD: 0000-0001-9349-2494

laboratory assistant-researcher, student, II category electronic engineer of the Laboratory of Mechanical Testing and Electron Microscopy

Russian Federation, 443086, Russia, Samara, Moskovskoye Shosse, 34; 654007, Russia, Novokuznetsk, Kirov Street, 42

Evgeny V. Aryshenskiy

Siberian State Industrial University

Email: arishenskiy_ev@sibsiu.ru
ORCID iD: 0000-0003-3875-7749

Doctor of Sciences (Engineering), Associate Professor, senior researcher of the Laboratory of Electron Microscopy and Image Processing

Russian Federation, 654007, Russia, Novokuznetsk, Kirov Street, 42

Egor A. Kudryavtsev

Belgorod State National Research University

Email: egoryoda@mail.ru
ORCID iD: 0000-0003-1113-0807

PhD (Engineering), researcher of the Common Use Center “Technologies and Materials of the National Research University BelSU”

Russian Federation, 308015, Russia, Belgorod, Pobedy Street, 85

Aleksandr M. Drits

Samara National Research University

Email: alexander.drits@samara-metallurg.ru
ORCID iD: 0000-0002-9468-8736

PhD (Engineering), leading researcher

Russian Federation, 443086, Russia, Samara, Moskovskoye Shosse, 34

Sergey V. Konovalov

Siberian State Industrial University

Email: konovalov@sibsiu.ru
ORCID iD: 0000-0003-4809-8660

Doctor of Sciences (Engineering), Professor, Pro-rector for Research and Innovative Activities

Russian Federation, 654007, Russia, Novokuznetsk, Kirov Street, 42

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Copyright (c) 2024 Zorin I.A., Aryshenskiy E.V., Kudryavtsev E.A., Drits A.M., Konovalov S.V.

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