[T6] AM Beam Based Technologies

[16B-T6-36] Influence of Heterogeneous Microstructure on Strength of Aluminum Bronze Fabricated by Laser Powder Bed Fusion

*K. Imai¹, Y. Sugitani¹, S. Matsumoto¹, Y. Shimpo¹, H. Kyogoku² (1.FUKUDA Metal Foil and Powder Co., Ltd., Japan, 2.Kindai University Fundamental Technology for Next Generation Research Institute, Japan)

キーワード：aluminum bronze, additive manufacturing, powder bed fusion, microstructure, strengthening mechanism

In this research, the microstructure and tensile properties of Cu–2–7 mass% Al alloys in the α single-phase region on the phase diagram fabricated by laser powder bed fusion (PBF-LB) process and casting were systematically examined, and their microstructure formation mechanism and strengthening mechanism were investigated. As a result, the micro-fine cellular structures formed by segregation of Al due to the constitutional supercooling by rapid solidification phenomenon in PBF-LB process leaded to high tensile strength and 0.2% proof stress, which were much higher than those of the castings. It was revealed that the high performance of the Cu–Al alloys in α single-phase region is attributed to heterogeneous microstructure of the alloys formed by rapid solidification phenomenon in PBF-LB process.