Recently, essential progress has been made in the analysis of rapid solidification phenomena and their consequences for the formation of a largely unexpected "supersaturated grain-refined equiaxed microstructure". The highly undercooled rapid solidification is a non-equilibrium solidification which changes the growth velocity and solidification behavior, thus inducing that the as-solidified alloy granular grains are unstable because of the non-equilibrium effects. It is very important to investigate how to obtain the microstructures with higher stabilization to extend their application. Grain...