Revealing hetero-deformation induced (HDI) stress strengthening effect in laminated Al-(TiB2+TiC)p/6063 composites prepared by accumulative roll bonding

Abstract

Laminated metal composites as a type of heterostructured materials, consisting of two or more metals, have attracted extensive attention for their excellent mechanical properties, electrochemistry characteristics and corrosion resistance. In this study, an Al-(TiB2+TiC)p/6063 laminated composite was successfully prepared for the first time using accumulative roll bonding (ARB) process up to three cycles. The particle distribution in Al-(TiB2+TiC)p layer became more dispersive with the increasing ARB cycles and the matrix α-Al grains were also refined significantly. The interfaces of 6063 and Al-(TiB2+TiC)p layers were well bonded and kept straight without any necking or fracture during the plastic deformation. The tensile strength and ductility of the laminated composites were increased simultaneously with increasing ARB cycles. Ultimate tensile strength, yield stress and elongation to failure of the composites increase to 255.8 MPa, 247.4 MPa and 11.6% after three ARB cycles, increased by 21.9%, 22.4% and 17.2%, respectively. It is revealed that hetero-deformation induced (HDI) stress played a crucial role in significant enhancement of tensile strength and ductility for the laminated composites.