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Влияние старения на механические и электрические свойства проводников Al – 0,35Cu – 0,18Sc – 0,06Zr для высокопроизводительных применений
Аннотация
Исследовано влияние режима старения на механические и электрические свойства жаропрочного электропроводного алюминиевого сплава Al – 0,35Cu – 0,18Sc – 0,06Zr. Установлено, что наиболее высокий комплекс эксплуатационных свойств сплава достигается после старения при температуре 663 К в течение 15 ч. После старения по этому режиму микроструктура сплава характеризуется однородным распределением в алюминиевой матрице дисперсных включений вторичных фаз Al3(Sc, Zr) размером 10 – 20 нм. Такая структура обеспечивает упрочнение сплава по механизму Орована, за счет чего предел прочности при растяжении возрастает до 170 МПа. При этом происходит значительное повышение электропроводности сплава до 60,4 % IACS за счет уменьшения искажения кристаллической решетки. Результаты испытаний на термостойкость в сочетании с построенными кривыми Аррениуса показали, что срок эффективной эксплуатации проводников Al – 0,35Cu – 0,18Sc – 0,06Zr при 503 К достигает 350400 ч.
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Литература
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DOI: https://doi.org/10.30906/mitom.2025.2.35-35
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