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Подавление эффекта Портевена-Ле Шателье электрическим током в алюминий-магниевом сплаве АМг6

Подавление эффекта Портевена-Ле Шателье электрическим током в алюминий-магниевом сплаве АМг6

Abstract

The direct current-induced suppression of the Portevin-Le Chatelier (PLC) effect has been revealed and investigated in Al-6wt. Mg alloy during tensile tests at a constant strain rate. Suppression of the PLC effect by direct electric current manifests itself as an increase in the critical strain e с for the onset of serration flow with increasing current density exceeding a certain critical value ~10-50 А/mm 2. The obtained results show that the observed suppression of jerky flow by electric current is not directly associated with Joule heating per se of the whole sample. Possible mechanisms of the phenomenon are discussed.

Проведены экспериментальные исследования влияния постоянного электрического тока на прерывистую деформацию Портевена-Ле Шателье алюминий-магниевого сплава АМг6, деформируемого с постоянной скоростью в жесткой испытательной машине. Обнаружен эффект подавления прерывистой деформации постоянным током, который выражается в увеличении критической деформации e с появления первого деформационного скачка на диаграмме растяжения с ростом плотности тока в диапазоне ~10-50 А/мм 2. Показано, что обнаруженный эффект не связан с джоулевым нагревом всего образца. Обсуждаются возможные механизмы явления.

Keywords

ЭФФЕКТ ПОРТЕВЕНА-ЛЕ ШАТЕЛЬЕ, ЭЛЕКТРОПЛАСТИЧНОСТЬ, ПОСТОЯННЫЙ ЭЛЕКТРИЧЕСКИЙ ТОК, АЛЮМИНИЙ-МАГНИЕВЫЕ СПЛАВЫ, ПРЕЦИПИТАЦИЯ, ЭЛЕКТРОМИГРАЦИЯ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
bronze