The microstructure and mechanical properties of A380 alloy fabricated by gravity casting with different V contents were investigated.The results show that with V addition

irregular block-like AlSiVFe phase can be observed in the alloy.With the increase of V content

the average length of AlSiVFe phase is increased from 15μm to 43μm

and the volume fraction is increased from 0.3%to 1.65%.The average length of β-Al5 FeSi phase is decreased from 47μm to 24μm.The phase constitution of the alloy is absent change after T6 treatment.The morphology of the Fe-rich phases has no obvious change after heat treatment.However

the fibrous eutectic Si phase is changed into granular particles.With the increase of V content

mechanical properties of the as-cast or heat-treated alloy are increased at first and then decreased.When the V content is 0.7%

the mechanical properties of the alloy reach the maximum value

where tensile strength

yield strength and elongation of the heat-treated alloy reach 244 MPa

226 MPa and 1.6%

respectively.