Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Structural Characterization of CoCrFeMnNi High Entropy Alloy Oxynitride Thin Film Grown by Sputtering

스퍼터링 방법으로 성장한 코발트크롬철망간니켈 고엔트로피 질산화물 박막의 구조특성

  • Lee, Jeongkuk (Department of Materials Science and Engineering, Chungnam National University) ;
  • Hong, Soon-Ku (Department of Materials Science and Engineering, Chungnam National University)
  • 이정국 (충남대학교 신소재공학과) ;
  • 홍순구 (충남대학교 신소재공학과)
  • Received : 2018.09.18
  • Accepted : 2018.09.28
  • Published : 2018.10.27
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Abstract

This study investigates the microstructural properties of CoCrFeMnNi high entropy alloy (HEA) oxynitride thin film. The HEA oxynitride thin film is grown by the magnetron sputtering method using nitrogen and oxygen gases. The grown CoCrFeMnNi HEA film shows a microstructure with nanocrystalline regions of 5~20 nm in the amorphous region, which is confirmed by high-resolution transmission electron microscopy (HR-TEM). From the TEM electron diffraction pattern analysis crystal structure is determined to be a face centered cubic (FCC) structure with a lattice constant of 0.491 nm, which is larger than that of CoCrFeMnNi HEA. The HEA oxynitride film shows a single phase in which constituting elements are distributed homogeneously as confirmed by element mapping using a Cs-corrected scanning TEM (STEM). Mechanical properties of the CoCrFeMnNi HEA oxynitride thin film are addressed by a nano indentation method, and a hardness of 8.13 GPa and a Young's modulus of 157.3 GPa are obtained. The observed high hardness value is thought to be the result of hardening due to the nanocrystalline microstructure.

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References

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