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Исследование высокопрочного сплава Al – Zn – Mg – Cu, обогащенного цинком и армированного частицами твердой керамики диборида титана
Аннотация
Изучено влияние упрочнения сплавов Al – Zn – Mg – Cu твердыми керамическими частицами TiB2 для получения композитов, применяемых в авиастроении. Для получения композитов использована технология литья с перемешиванием. Оптическая микроскопия показала тонкое диспергирование частиц TiB2 в матрице. Рентгенодифракционный анализ подтвердил наличие упрочняющих частиц в композитах. Твердость, ударная вязкость и прочность на растяжение измеряли в соответствии с нормами ASTM. По сравнению с литым сплавом AA7085, твердость полученных композитов выше на 18, 25 и 31 % при содержании TiB2 3, 6 и 9 % (масс.) соответственно. Однако из-за высокой плотности дислокаций в межфазных областях композита увеличение содержания TiB2 приводит к снижению ударной вязкости. Прочность на растяжение композитов с 3, 6 и 9 % (масс.) TiB2 на 30, 47 и 61 % выше соответственно, чем у обычного сплава AA7085. Это объясняется эффективным межфазным сцеплением и наличием мелкодисперсных включений TiB2, равномерно распределенных по всему зерну a-фазы. При этом сильная межфазная адгезия между TiB2 и AA7085 способствует вязкому разрушению.
Ключевые слова
Литература
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DOI: https://doi.org/10.30906/mitom.2026.4.54-55
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