However, in some particular high-loading structural applications, metallic materials shall also have large ductility and high toughness to facilitate the precise forming of structural components and to avoid the catastrophic failure of components during service. Unfortunately, increasing strength often leads to the decrease in ductility, which is known as the strength-ductility trade-off. For example, ceramics and amorphous materials have negligible ductility, although they have great hardness and ultra-high strength. To simultaneously increase both strength and ductility of metallic materials using conventional industrial processing routes is both of great scientific and technological importance and is yet quite challenging in both the materials science community and industry sectors.