Abstract
This paper illustrated the effects of aging treatment on microstructural evolution and mechanical properties of the SLM printed Al-Zn-Mg-Cu-Si-Zr alloy systematically. Various aging time and aging temperature were adopted in the experiment to obtain the optimal aging parameters, and maximum tensile strength of 508 MPa, yield strength of 451 MPa and elongation to failure of 7.6% were achieved. The XRD spectrum shows the appearance of Mg2Si phases after aging treatment which was precipitated in the matrix. In addition, Al3Zr phases in the 150 °C/4 h sample were observed by EBSD and confirmed by TEM, which was responsible for the high mechanical properties of alloys. As the aging temperature increased from 150 °C to 230 °C, the average grain size increased from 3.08 to 4.18 μm and most of precipitated phases were transformed from small subsphaeroidal particles into large band-like phases.
NSTL
Elsevier