The CoCrFeMnNi high-entropy alloy (HEA), which is the most widely known HEA with a single facecentered cubic structure, has attracted significant academic attention over the past decade owing to its outstanding multifunctional performance. Recent studies have suggested that CoCrFeMnNi-type HEAs exhibit excellent printability for selective laser melting (SLM) under a wide range of process conditions. Moreover, it has been suggested that SLM can not only provide great topological freedom of design but also exhibit excellent mechanical properties by overcoming the strength–ductility trade-off via producing a hierarchical heterogeneous microstructure. In this regard, the SLM-processed CoCrFeMnNi HEA has been extensively studied to comprehensively understand the mechanisms of microstructural evolution and resulting changes in mechanical properties. In this review, recent studies on CoCrFeMnNi-type HEAs produced using SLM are discussed with respect to process-induced microstructural evolution and the relationship between hierarchical heterogeneous microstructure and mechanical properties.

Abstract
1. 서 론
2. CoCrFeMnNi계 합금의 SLM 적용 연구 동향
    2.1. SLM 조형체의 미세조직학적 특성
    2.2. 미세조직-기계적 물성 상관관계 연구동향
    2.3. 조형체 후열처리 연구동향
3. 결 론
References

• 박정민(한국재료연구원 분말재료연구본부 3D프린팅재료연구실) | Jeong Min Park (Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea) Corresponding author