Strain rate sensitivity of titanium matrix composites: In the presence of laminated structure

Abstract

The strain rate sensitivity (SRS) plays an important role in the deformation of metal materials. We presented SRS studies of a kind of thick-layer-laminated Ti–TiB/Ti-6.58Al-1.76Zr-0.89Mo-1.04V composites to give an insight into the deformation mechanism. The SRS of the laminated composites decreased with increasing plastic strain, and the strength and SRS both agreed with the rule of mixture. The strain hardening exponent of the laminated composites was also higher than the TiB/TA15 composite but lower than the pure Ti. After the onset of necking, it is believed that stress redistribution would occur in the necking area of the laminated composites due to the SRS differences between adjacent layers. This stress redistribution resulted in the post-necking deformation ability enhancement of the laminated composites.