Abstract Scope |
In this work, we use a new Al-5Mg2Si-2Mg alloy to produce high-strength and ductile for laser powder bed fusion (LPBF) process. The as-LPBFed alloy is found to deliver much less hot cracks and defects, and excellent mechanical property, which include 452 MPa of UTS, 295 MPa of yield strength (YS) and 9.3% of elongation. The as-LPBFed alloy is featured by the significantly refined cellular microstructures, including the primary α-Al and the eutectic Mg2Si phases and α-AlFeMnSi phase. After ageing at 180 ºC for 3.5 h, the ultrafine in-situ Mg2Si particles are formed inside the cell. The YS of 377 MPa, UTS of 488 MPa and elongation of 9.6 % are achieved. The excellent mechanical properties and processability are attributed to (a) the reduced solidification range, (b) the refined α-Al grains, (c) the formation of supersaturated solid solution, and (d) the precipitation of nanophases. |