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Korean Journal of Metals and Materials > Volume 56(1); 2018 > Article
Korean Journal of Metals and Materials 2018;56(1): 26-33. doi: https://doi.org/10.3365/KJMM.2018.56.1.26
CoCrFeMnNi 고엔트로피 합금에서 탄소 첨가 및 재결정열처리가 미세구조 및 기계적 특성에 미치는 영향
고준영, 송재숙, 홍순익
충남대학교 신소재공학과
Effect of Carbon Addition and Recrystallization on the Microstructure and Mechanical Properties of CoCrFeMnNi High Entropy Alloys
Jun Yeong Ko, Jae Sook Song, Sun Ig Hong
Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
Correspondence  Sun Ig Hong ,Tel: +82-42-821-7637, Email: sihong@cnu.ac.kr
Received: 23 May 2017;  Accepted: 25 September 2017.  Published online: 1 January 2018.
ABSTRACT
The effect of carbon addition on the cast and rolled microstructures of CoCrFeMnNi high entropy alloys were studied. Both as-cast CoCrFeMnNi and CoCrFeMnNiC0.1 alloys have a dendritic microstructure. Small carbide particles were observed at the inter-dendritic region in the as-cast CoCrFeMnNiC0.1 and elongated-grained structure with aligned carbides were developed at grain boundaries in CoCrFeMnNiC0.1 after homogenization. The grain size decreased from 9.2 μm to 5.8 μm with the addition of 0.1 wt% carbon. The decrease in grain size is due to its high stored cold work energy during deformation processing, resulting in more active recrystallization in CoCrFeMnNiC0.1 and the pinning effect of carbides. The strengthening in CoCrFeMnNiC0.1 is most likely attributed to solid solution strengthening and nanoscale carbide strengthening, because grain size strengthening was found to be not as effective.
Keywords: high entropy alloys, carbon, interstitial, CoCrFeMnNi, carbide
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