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. 2023 Mar 28;16(7):2694. doi: 10.3390/ma16072694

Figure 4.

Figure 4

Microstructure of the T4 heat-treated WAAM Al-Cu alloy with different contents of Cu: (a) is the microstructure of the accumulated body with 5.0% Cu content under T4 heat treatment, the grain size is 40–50 μm, and no large size precipitated phase is found at the grain boundary; (b) is the microstructure of the accumulated body with 5.65% Cu content under T4 heat treatment, the grain size is 40–50 μm, and no large size precipitated phase is found at the grain boundary; (c) is the microstructure of the accumulated body with 6.3% Cu content under T4 heat treatment, the grain size is 40–50 μm, and large size precipitated phase is found at the grain boundary (C1).