Influence of Mesostructure on Mechanical Property of Laminated Ti–Al Composites

Abstract

Laminated Ti-Al composite sheets with different mesostructures have been fabricated through hot pressing. The influence of mesostructure on mechanical properties of the composite is investigated. The results indicate that with the increase of sintering temperature, different mesostructures of composite are obtained, that is, laminated Ti/Ti-Al composite, laminated Ti 3 Al/TiAl composite, and monolithic Ti 3 Al/TiAl composite. The mechanical properties tests reveal that laminated Ti/Ti-Al composite exhibits better comprehensive mechanical properties, including flexural strength, fracture toughness, and microhardness, than those of laminated Ti 3 Al/TiAl composite and monolithic Ti 3 Al/TiAl composite. The fracture analysis shows that the propagation route of crack is zigzag for Ti/Ti-Al composite, curving for laminated Ti 3 Al/TiAl composite, and approximately a straight line for monolithic Ti 3 Al/TiAl composite. The relevant strengthening and toughening mechanism of the composites is discussed.

Investigation of preparation and properties of Ti3SiC2/Al2O3 multilayered composites

“…toughness is improved. [1][2][3] According to Clegg, the mechanical properties of laminated composites mainly depend on the matrix materials, which generally include Al 2 O 3 , ZrO 2 , SiC, Si 3 N 4 , and other high-strength structural ceramics. 4 These ceramics, when used as single-phase ceramics, fracture catastrophically during crack propagation.…”

“…Multilayered composites originate from bionic designs, which simulate the special laminar structure of living organisms such as bamboo shells in nature. Due to its special laminated structure, the cracks propagate layer by layer and deflect between layers in such a way that the propagation path of cracks is prolonging, and the fracture toughness is improved 1–3 . According to Clegg, the mechanical properties of laminated composites mainly depend on the matrix materials, which generally include Al 2 O 3 , ZrO 2 , SiC, Si 3 N 4 , and other high‐strength structural ceramics 4 .…”