We investigated the microstructure of an FeCrMnNiCo alloy fabricated by spark plasma sintering under different sintering temperatures (1000–1100°C) and times (1–600 s). All sintered alloys consisted of a single face-centered cubic phase. As the sintering time or temperature increased, the grains of the sintered alloys became partially coarse. The formation of Cr7C3 carbide occurred on the surface of the sintered alloys due to carbon diffusion from the graphite crucible. The depth of the layer containing Cr7C3 carbides increased to ~110 μm under severe sintering conditions (1100°C, 60 s). A molten zone was observed on the surface of the alloys sintered at higher temperatures (>1060°C) due to severe carbon diffusion that reduced the melting point of the alloy. The porosity of the sintered alloys decreased with increasing time at 1000°C, but increased at higher temperatures above 1060°C due to melting-induced porosity formation.

1. Introduction 
2. Experimental Procedure 
3. Results and Discussion 
    3.1. 소결체의 미세조직 
    3.2. 소결체 표면에서의 침탄 거동 
    3.3. 소결체 내부의 기공 변화 
    3.4. 소결 조건에 따른 경도 변화 
4. Conclusion 
Conflict of Interest Declaration  
Author Information and Contribution  
Acknowledgement
References

• 박성현(전북대학교 신소재공학부) | Seonghyun Park (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 이상화(전북대학교 신소재공학부, 조선대학교 고엔트로피합금부식연구센터) | Sang-Hwa Lee (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea, Corrosion Research Center for High Entropy Alloy, Chosun University, Gwangju 61452, Republic of Korea) Corresponding author
• 이준호(전북대학교 신소재공학부) | Junho Lee (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 이석재(전북대학교 신소재공학부, 전북대학교 신소재개발연구센터) | Seok-Jae Lee (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 정재길(전북대학교 신소재공학부, 전북대학교 신소재개발연구센터) | Jae-Gil Jung (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)