Enhanced toughness and strength of multi-laminated TiAl composite sheets reinforced by periodic titanium alloy layers and carbides particles
Novel multi-laminated TC4/Ti2AlC–TiAl composite sheets were successfully fabricated by spark plasma sintering (SPS) at 1100 °C. Ti3Al interface layers connect the composite layers with the TC4 titanium alloy layers. The performance of the composite sheets exhibits anisotropy. The mechanical properties of the composite sheets perpendicular to the laminated structure are obviously higher than that of the composite sheets parallel to the laminated structure. Especially, the flexural strength and fracture toughness of the composite sheet with the theoretical amount of 10 wt% Ti2AlC are 1346.98 MPa and 67.72 MPa·m1 / 2, respectively. Due to the synthetic actions, the flexural strength of the composite sheets are significantly improved by the fine TiAl grains through doping TiC so that the plasticity of the composite layers is improved with more crystal surfaces of α 2-γ phase on any stress section. What' more, not only the efficient obstruction of the carbides particles to the crack propagation, but also the passivation of the toughening layers on the crack extension can also improve the toughness of the composite sheets.
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Document Type: Research Article
Publication date: August 1, 2018
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