Abstract
In this work, the nano-ZrO2 particles were mixed into AlSi10Mg alloy to prepare ZrO2/AlSi10Mg composites with different x wt.% ZrO2 (x = 0, 0.15, 0.3, 0.45, 0.6, 0.75). The microstructure, mechanical properties and the anisotropy of the ZrO2/AlSi10Mg composites fabricated by laser powder bed fusion (LPBF) were studied. The results show that nano-ZrO2 particles can be uniformly dispersed on the AlSi10Mg powder by the method of pre-dispersion and mechanical mixing. When the mass ratio of ZrO2 in ZrO2/AlSi10Mg composites is 0.3 wt%, the values of the tensile strength, yield strength and elongation are 493.64 MPa, 321.30 MPa and 11.74%, respectively. Compared with AlSi10Mg alloy, the tensile strength of ZrO2/AlSi10Mg composites with 0.3 wt% is increased by 30–55 MPa and the elongation is increased by 3–5%. In addition, the mechanical properties of AlSi10Mg alloy and ZrO2/AlSi10Mg composites of 0.3 wt% exhibit antistrophic behavior in different direction, which is due to the differences of microstructure, texture and stress distribution between transverse direction (TD) and build direction (BD). Compared with other AlSi10Mg matrix composites, ZrO2/AlSi10Mg composites of this work show excellent strength and plasticity matching.
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