Вплив холодної пластичної деформацiї на електроопiр високоентропiйного сплаву CrMnFeCoNi

Автор(и)

  • Yu. P. Mazur Taras Shevchenko National University of Kyiv, Faculty of Physics
  • R. V. Ostapenko Taras Shevchenko National University of Kyiv, Faculty of Physics
  • M. P. Semen’ko Taras Shevchenko National University of Kyiv, Faculty of Physics

DOI:

https://doi.org/10.15407/ujpe62.05.0413

Ключові слова:

high-entropy alloy, electrical resistivity, K-state, plastic deformation, structure

Анотація

Дослiджено вплив холодної деформацiї вальцюванням на електротранспортнi властивостi високоентропiйного сплаву (ВЕСу) CrMnFeCoNi. Показано, що з ростом величини деформацiї при вальцюваннi, E, питомий електроопiр, p, цього сплаву зменшується, а температурний коефiцiєнт опору, a, зростає. При цьому, методом рентгенiвської дифракцiї нiяких фазових змiн не виявлено. Така поведiнка p та a вiд E вiдрiзняється вiд поведiнки цих величин бiльшостi традицiйних металевих сплавiв. Встановлено, що температурна залежнiсть електроопору при нагрiваннi деформованих зразкiв характеризується аномальною S-подiбною формою. По положенню таких S-аномалiй при рiзних швидкостях нагрiвання, методом Кiссiнджера визначено енергiю активацiї Ea процесу, що вiдповiдає за аномалiю. Форма залежностi p(T) та величина Ea дають пiдставу вiднести такi особливостi поведiнки p деформованих зразкiв до iснування в дослiдженому ВЕСi “К-стану”, що проявляється в деяких деформованих сплавах на основi перехiдних металiв. Обговорено можливi термодинамiчнi причини виникнення цього стану

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Опубліковано

2018-12-15

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