Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.13091/4598
Title: | Effect of in-situ formed oxide and carbide phases on microstructure and corrosion behavior of Zr/Y doped CoCrFeNi high entropy alloys prepared by mechanical alloying and spark plasma sintering | Authors: | Kotan, Hasan Tekin, Mustafa Bayatlı, Aleyna Bayrak, Kübra Gürcan Kocabaş, Mustafa Ayaş, Erhan |
Keywords: | High entropy alloys Mechanical alloying and milling Alloy design Microstructure Grain growth Oxidation Thermal-Stability Nanocrystalline Materials Grain-Growth Evolution Strength |
Publisher: | Elsevier Sci Ltd | Abstract: | The present work has examined the microstructural evolution, thermal stability, hardness, and corrosion behavior of Zr/Y doped CoCrFeNi HEAs prepared through high-energy mechanical alloying followed by spark plasma sintering (SPS) at 1100 degrees C. The achieved microstructures were investigated by XRD and TEM techniques. The results showed that investigated HEAs consist of an fcc solid solution of CoCrFeNi matrix with in-situ formed Cr-C carbides and Cr/Zr/Y based oxide phases. The SPS processing of CoCrFeNi yielded grain growth to 370 & PLUSMN; 60 nm, while 240 & PLUSMN; 160 nm grain size with bimodal grain size distribution and 165 & PLUSMN; 38 nm grain size were achieved with Zr and Y additions, respectively. The effects of microstructural changes on the hardness and corrosion behaviors of HEAs were also investigated. Compared with 372 & PLUSMN; 15 HV hardness of CoCrFeNi HEA, 445 & PLUSMN; 26 HV and 563 & PLUSMN; 58 HV hardness values were determined with Zr and Y doped HEAs, respectively. The increase in hardness is mainly ascribed to the precipitation strengthening of carbide and oxide phases as well as smaller grain sizes. The corrosion analysis showed that, although the achieved smaller grain sizes and the presence of different oxide types when dopped with Y and Zr impaired the corrosion resistance, the investigated HEAs have reasonable resistance to corrosion when compared to SS304 stainless steel. | URI: | https://doi.org/10.1016/j.intermet.2023.107998 https://hdl.handle.net/20.500.13091/4598 |
ISSN: | 0966-9795 1879-0216 |
Appears in Collections: | Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections |
Show full item record
CORE Recommender
SCOPUSTM
Citations
1
checked on Oct 5, 2024
WEB OF SCIENCETM
Citations
8
checked on Oct 5, 2024
Page view(s)
94
checked on Oct 7, 2024
Google ScholarTM
Check
Altmetric
Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.