Revealing extraordinary tensile plasticity in layered Ti-Al metal composite

作者：Meng Huang, Guohua Fan, Lin Geng, Giacomo Cao, Yan Du, Hao Wu, T. T. Zhang, Huijun Kang, T. M. Wang, G. H. Du, Honglan Xie · 发表于：Scientific Reports · 年份：2016 · DOI：10.1038/srep38461 · 被引用次数：95 · 研究领域：Microstructure and mechanical properties、Aluminum Alloys Composites Properties、Advanced Welding Techniques Analysis

Layered Ti-Al metal composite (LMC) fabricated by hot-pressing and hot-rolling process displays higher ductility than that of both components. In this paper, a combination of digital image correlation (DIC) and X-ray tomography revealed that strain delocalization and constrained crack distribution are the origin of extraordinary tensile ductility. Strain delocalization was derived from the transfer of strain partitioning between Ti and Al layer, which relieved effectively the strain localization of LMC. Furthermore, the extensive cracks of LMC were restricted in the interface due to constraint effect. Layered architecture constrained the distribution of cracks and significantly relieved the strain localization. Meanwhile, the transfer of strain partitioning and constrained crack distribution were believed to inhibit the strain localization of Ti and change the deformation mechanisms of Ti. Our finding enriches current understanding about simultaneously improving the strength and ductility by structural design.