Механические и трибологические свойства высокоэнтропийных сплавов CoCrCu_xFeNi₂ с высоким содержанием никеля

Работа посвящена изучению возможности повышения предела растворимости меди в высокоэнтропийных сплавах (ВЭС) системы CoCrCuFeNi путем двукратного увеличения концентрации никеля и проведения дополнительной термической обработки. ВЭС CoCrCu_xFeNi₂ изготовлены механическим легированием элементных порошковых смесей и их последующим горячим прессованием. Исследованы микроструктура и фазовый состав ВЭС CoCrCu_xFeNi₂ в зависимости от концентрации Cu (x = 0; 0,25; 0,5; 0,75; 1,0). Анализ химического состава матрицы сплава на основе ГЦК твердого раствора позволил определить растворимость меди. Показано, что двукратное (относительно эквиатомного) содержание никеля способствовало получению ВЭС с однофазной ГЦК-структурой при x ≤ 0,75. Последующая термическая обработка ВЭС привела к увеличению растворимости меди до 17,5 ат.%. Проведены испытания механических и трибологических свойств ВЭС CoCrCu_xFeNi_y. В сплавах CoCrCu_xFeNi₂ достигнут высокий уровень прочности при растяжении (от 910 до 1045 МПа) и твердости (285–395 HV). Несмотря на повышение предела растворимости меди, термическая обработка привела к понижению механических свойств на 35–50 % из-за увеличения размера зерен до 5,5 мкм. Минимальным приведенным износом при трении в паре с контртелом из Al₂O₃ обладают сплавы CoCrCu_0,75FeNi₂ и CoCrCuFeNi₂ (1,58·10^–5 и 1,48·10^–5 мм³/(Н·м) соответственно).

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