Microstructure and mechanical properties of Ti6Al4V based laminated composites at various rolling reductions

• Published in: Composites communications 2022-08, Vol.33, p.101212, Article 101212
• Main Authors: Wang, Shuai, Huang, LuJun, Liu, BaoXi, Peng, Hua-Xin, Jiao, Yang, Geng, Lin
• Format: Article
• Language: English
• Subjects: Hot rolling; Laminated structure; Tensile property; Titanium matrix composites
• ISSN: 2452-2139; 2452-2139
• DOI: 10.1016/j.coco.2022.101212

To investigate the effect of hot rolling on laminated metal matrix composites, a kind of Ti6Al4V–TiB/Ti6Al4V composite was fabricated through reaction hot pressing and hot rolling. After rolling, the layer thickness and matrix grain size decreased significantly, and improvement in both the tensile strength and deformation ability was achieved. Increasing rolling reduction led to a descending trend of deformation ability while the strength remained almost unchanged. The changing trend of strength should be explained by the complementary of increasing strengthening effect by strain hardening, and the weakening effect of more TiB whiskers fracture. While for plasticity, increasing rolling reduction resulted in TiB whiskers-matrix interface decohesion, which promoted the formation of micro-cracks. Moreover, high rolling reduction led to stress concentration at the layer interface and accelerated the generation of layer interface cracks during tension. [Display omitted] •Laminated titanium matrix composites were fabricated by reaction hot pressing and hot rolling.•The hot rolled composites exhibited a 16% increase in strength and doubled ductility compared with the as-sintered one.•Rising rolling reduction led to the drop in ductility, and the strength had almost no change.•The effect of rolling reduction on the tensile properties was clarified.