Boron carbide (B4C) is highly significant in the production of lightweight protective materials when added to aluminum owing to its exceptional mechanical properties. In this study, a method for fabricating Al-B4C composites using high-energy ball milling and directed energy deposition (DED) is presented. Al-4 wt.% B4C composites were fabricated under 21 different laser conditions to analyze the microstructure and mechanical properties at different values of laser power and scan speeds. The composites fabricated at a laser power of 600 W and the same scan speed exhibited the highest hardness and generated the fewest pores. In contrast, the composites fabricated at a laser power of 1000 W exhibited the lowest hardness and generated a significant number of large pores. This can be explained by the influence of the microstructure on the energy density at different values of laser power.

1. Introduction
2. Experimental
    2.1 복합분말 제조
    2.2 DED 공정 조건
    2.3 분석
3. Results and Discussion
    3.1 복합분말
    3.2 DED 공정
4. Conclusion
Acknowledgement

• 안유정(순천대학교 신소재공학과) | Yu-Jeong An (Department of Materials Science and Metallurgical Engineering, Sunchon National University, Suncheon 57922, Republic of Korea)
• 신세은(순천대학교 신소재공학과) | Se-Eun Shin (Department of Materials Science and Metallurgical Engineering, Sunchon National University, Suncheon 57922, Republic of Korea) Corresponding Author
• 한주연(국민대학교 신소재공학과) | Ju-Yeon Han (Department of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea)
• 최현주(국민대학교 신소재공학과) | Hyunjoo Choi (Department of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea)