Effect of heat treatment on solute Si content in Al-12%Si alloy additive-manufactured by laser powder bed fusion

We have investigated microstructural characteristics and solute Si element in the α-Al (fcc) matrix of Al-12%Si binary alloy additive-manufactured by laser powder bed fusion (L-PBF) process terms different locations melt-pool structure (inside or around boundaries). Their variations post heat-treatments at various temperatures were examined. The fraction phase lattice parameter quantified XRD measurements combined with sample rotation oscillation systems. In L-PBF manufactured sample, columnar phases contained highly concentrated solution (above 3 mol%) inside melt-pools, whereas measured content was approximately 2 mol% relatively coarsened along boundaries. location dependence would be associated a continuous change growth rate solid solidification local heating process. significantly reduced its appeared less pronounced. as-manufactured exhibited lower comparison heat-treated samples. became higher These results rationalized elevated temperatures.