2 A14 aluminum alloys wheel hub forging blank with different Sc contents were prepared by casting and isothermal compound forging.Effects of Sc additions on the mechanical properties and microstructure of 2 A14 aluminum alloy wheel hubs were investigated.The results reveal that the grain in the 2 A14 aluminum alloy can be refined greatly

and most of the grains present equiaxed grain with the addition of Sc element to 0.3%.Although the Sc element can improve the elongation of the 2 A14 aluminum alloy wheel hub

it can reduce significantly tensile strength to below 400 MPa

which is mainly related to the fact that the Sc element can consume Cu elements in the 2 A14 aluminum alloy

resulting in a decrease of strengthening phaseθ′-Al2 Cu.However

the Sc element can inhibit recrystallization

narrow the performance difference between the various parts of the alloy hub

and thus improving the thermal stability.