OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 1 2023 a b c Fig. 3. Typical microstructure of specimens printed from C65500 with the addition of 10 wt.% Al (a), 10 wt.% Al–5Si (b) and 10 wt.% Al-12Si (c) XRD and EDS analysis phase composition samples It was established from the results of X-ray phase analysis that all the studied specimens were mainly composed of the α-Cu solid solution (Fig. 4). The specimens printed with the addition of aluminum filaments additionally contained iron and particles of silicon silicide that were formed due to the presence of iron in the Al-Si wires. According to the known phase diagrams [26–31], alloys of the Cu–Al–Si system can have two phases, namely, FCC α-Cu phase and HCP γ-phase. In the samples under consideration, it was found using the EDS that the secondary γ-phase contains (copper-balance) ~7 at.% Al, ~(9–10)at. % Si and ~(0.5–0.6) at.% Mn, while the α-phase contains ~10 at.% Al, ~(3.5–5) at.% Si and ~(1.2–1.5) at.% Mn. The higher silicon content is observed obviously in the case of the adding of silumins to the bronze. Fig. 4. X-ray diffraction patterns of specimens printed from C65500 and with the addition of aluminum filament. Printing modes 1 (1), 2 (2) and 3 (3). Specimens after annealing (4), deformation and subsequent annealing (5). Specimens with the addition of 10 wt.% Al (6), 10 wt.% Al–5Si (7) and 10 wt.% Al-12Si (8)
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