1.Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China2. Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
Multilayered metallic composites play a very important role in the aerospace,automobile, shipbuilding and nuclear power fields. Compared with traditional monolithic metals, multilayered metallic composites have superhigh plastic deformation capability and fracture toughness. This paper provides a review on strain delocalization and fracture instability delaying characteristics and mechanisms, and summarizes the effect of periodic multiple necking,delamination cracks, multiple tunnel cracks and dispersed shear bands on suppressing plastic instability of multilayered metallic composites.Meanwhile, this review elucidates the toughening mechanism and ductile-brittle transition behavior of multilayered metallic composites by delamination cracks, crack bifurcation and tunnel crack modes, which can provide the new design idea and technique support for the strengtheningtoughening of metals.