An additively manufactured heat-resistant Al-12Si alloy via introducing stable eutectic engineering

Structures with superior heat-resistance properties generally require complex geometries and compound material properties. Therefore, laser-powder bed fusion (L-PBF) was used to conduct additive manufacturing in Al-12Si alloys. Force inhibiting the broken-up of Si eutectics and solid barriers obstructing dislocation motion could be realized at elevated temperatures because of the high partition coefficients and low diffusion rates of Fe/Ni segregation. The mechanical response of L-PBFed Al-12Si alloy has improved significantly with Fe/Ni addition, and the obtained results were much better than other heat-resistant alloys such as Al-Ni, Al-Fe, and Al-Ce. The findings demonstrate that incorporating stable eutectic engineering is quite promising for the design and fabrication of complex structures with heat-resistant functions.