The effects of solid solution time and aging time on the microstructure and mechanical properties of ZL205 A alloy specimens was investigated at T6 state formed by selective laser melting（SLM）. The result indicate that when the solution time is increased from 10 h to 14 h with the aging time of 4 h

the solid solubility is increased and a large amount of the second θ-Al

2

Cu phases are precipitated and uniformly distributed in the α-Al substrate

where the tensile strength is increased from 327 MPa to 369.26 MPa. With the aging time increasing gradually

the mechanical properties of the specimens present a trend of rising firstly and then declining. The precipitated θ phase becomes larger after aging for 6 h

resulting in the decline of the mechanical properties of the formed specimens. After solid solution for 14 h and aging for 6 h

the tensile strength

yield strength and the elongation reach 387.84 MPa

241 MPa and 6.77%

respectively. Therefore

the desirable tensile strength and elongation can be obtained by solid solution at 538 ℃ for 14 h and aging at 150 ℃ for 6 h.