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SEM and EDS of the T4 heat-treated WAAM Al-Cu alloy with different contents of Cu: (a) is the SEM in the as-deposit with 5.0% Cu content under T4 heat treatment, A1 is T phase; (b) is the SEM in the as-deposit with 5.65% Cu content under T4 heat treatment, B1 is T phase, B2 is θ phase; (c) is the SEM in the as-deposit with 6.3% Cu content under T4 heat treatment, C1 is T phase, C2 is θ phase.
