Configuration design and fabrication of laminated titanium matrix composites

• Published in: Materials & design Vol. 99; pp. 219 - 224
• Main Authors: Duan, Hongqiang, Han, Yuanfei, Lu, Weijie, Wang, Liqiang, Mao, Jianwei, Zhang, Di
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 05.06.2016
• Subjects: Agglomerates; Elongation; Hot rolling; Laminated structure; Mechanical properties; Microstructure; Particulate composites; Reinforcement; Tensile strength; Titanium; Titanium matrix composite; Volume fraction; Titanium matrix composite; Laminated structure; Reinforcement; Mechanical properties; Microstructure
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2016.03.061

The introduction of particulate reinforcements into titanium alloys can improve the strength and stiffness, but it generally results in unsatisfactory plasticity and ductility. In this study, in situ synthesized multilayer titanium matrix composites were designed and fabricated by learning from the microstructure of nature biological materials with attractive mechanical properties. Laminated Ti-(TiB+La2O3)/Ti composites with different reinforcement volume fraction were fabricated through powder metallurgy, followed by hot rolling process. The results show that pore defects, TiB whisker and large La2O3 particle agglomerates can be observed in the composites after vacuum sintering at 1573K, further the pores are disappeared and the grains are refined significantly after hot rolling at 1323K. Meanwhile, the reinforcements agglomerates are well dispersed and distributed uniformly along the rolling direction. The tensile testing results indicate that the Ti-10vol.% (TiB+La2O3)/Ti composite shows promising mechanical properties due to the configuration design of laminated structure, which results in an improvement of 30% in elongation with <4% decline in tensile strength compared with 5vol.% (TiB+La2O3)/Ti composites. Moreover, further increase in reinforcement volume fraction leads to slight increase in tensile strength and significant decrease in elongation due to the increasing of large La2O3 agglomerates. [Display omitted] •Laminated titanium matrix composites were designed and fabricated.•Homogeneous layers and reinforcements were obtained in the laminated composites.•Both the tensile strength and ductility are improved by the laminated structure.•Large flocculent La2O3 particles are harmful to the tensile properties.