Effect of heat treatment on the structure and hardness of high-entropy alloys CoCrFeNiMnVx (x = 0.25, 0.5, 0.75, 1)
- Авторлар: Shaysultanov D.1, Stepanov N.1, Salishchev G.1, Tikhonovsky M.2
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Мекемелер:
- Belgorod National Research University
- Kharkov Institute of Physics and Technology
- Шығарылым: Том 118, № 6 (2017)
- Беттер: 579-590
- Бөлім: Structure, Phase Transformations, and Diffusion
- URL: https://journals.rcsi.science/0031-918X/article/view/167101
- DOI: https://doi.org/10.1134/S0031918X17060084
- ID: 167101
Дәйексөз келтіру
Аннотация
High-entropy alloys CoCrFeNiMnVKharkov Institute of Physics and Technology, ul. Akademicheskaya 1, Kharkov 61108 (Kharkov Institute of Physics and Technology, ul. Akademicheskaya 1, Kharkov 61108 = 0.25, 0.5, 0.75, 1) were prepared by vacuum arc melting. The structure and microhardness of the alloys have been studied in the cast state and after annealing at temperatures of 700–1100°C. It has been found that the alloys consist of the fcc (γ) solid solution and intermetallic sigma (σ) phase. The volume fraction of the σ phase increases with increasing vanadium content. As a result of annealing, phase transformations occur, including the precipitation of σ particles from the γ phase and, vice versa, the precipitation of γ particles from the σ phase. It has been shown that the change in the volume fraction of the σ phase upon annealing occurs due to the changes in the total content of σ-forming elements, chromium and vanadium, in accordance with the lever rule. With increasing temperature, the volume fraction of the σ phase varies nonmonotonically; first, it increases, then it decreases. The microhardness of the alloys correlates well with the change in the volume fraction of the σ phase. The mechanisms of the phase transformations and quantitative relationships between chemical and phase compositions of the alloys and their hardness are discussed.
Негізгі сөздер
Авторлар туралы
D. Shaysultanov
Belgorod National Research University
Хат алмасуға жауапты Автор.
Email: shaysultanov@bsu.edu.ru
Ресей, ul. Pobedy 85, Belgorod, 308015
N. Stepanov
Belgorod National Research University
Email: shaysultanov@bsu.edu.ru
Ресей, ul. Pobedy 85, Belgorod, 308015
G. Salishchev
Belgorod National Research University
Email: shaysultanov@bsu.edu.ru
Ресей, ul. Pobedy 85, Belgorod, 308015
M. Tikhonovsky
Kharkov Institute of Physics and Technology
Email: shaysultanov@bsu.edu.ru
Украина, ul. Akademicheskaya 1, Kharkov, 61108