Abstract
A novel Al-Zn-Mg-Cu-Si-Zr-Er as-printed alloy with a tensile strength of 450 MPa was successfully prepared by laser powder bed fusion (LPBF). Solidification cracks were effectively suppressed by the synergistic effect of Si, Zr and rare earth Er. Many cellular eutectic structures composed of α-Al, Mg2Si and Al2CuMg phases were observed in the alloy, with Al3(Er, Zr) and MgZn2 as the fine precipitates inside the cells. In addition, twins were observed for the first time in Al-Zn-Mg-Cu alloy prepared by LPBF due to the high rapid solidification inherent to LPBF. Twin boundaries acted as nucleation point for the precipitation of Mg2Si and Al2CuMg, which is called “twin nucleation” theory. This study could provide a scientific theoretical reference and new approach for the preparation of high-strength aluminum alloys by LPBF.
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