Strengthening and toughening of laminated TiAl composite sheets by titanium alloy layers and carbide particles

Abstract

Laminated sheets with Ti2AlC/TiAl composite layers synthesized from the Ti–Al–TiC system and TC4 titanium alloy as the toughening layer were fabricated by spark plasma sintering. Their phase composition and microstructure were analyzed and flexural strength and fracture toughness measured. The composite layers mainly comprised Ti2AlC, TiC, TiAl, and Ti3Al phases. The flexural strength and fracture toughness of the sheets perpendicular to the laminated direction were 455.74 MPa and 21.65 MPa · m1/2, respectively. The TC4 layers provided a strengthening–toughening effect by changing the crack propagation model and weakening the fracture energy. Ti2AlC particles provided a strengthening effect. The synergistic effect of the two components enhanced the mechanical properties of these TiAl-based laminated composite sheets.

The impact of laser surface treatment on the microstructure, wear resistance and hardness of the AlMg5 aluminum alloy

“…Ti and Al-based intermetallic phases are characterized by, among others, low density, good high temperature strength and creep resistance, fatigue, oxidation, and corrosion resistance [19] The introduction of intermetallic phases such as Al 3 Ti or Al 2 Ti allows a significant increase in the strength and hardness of aluminum alloys. As the research shows the density of Al 2 Ti is about 3.53-3.54 g/cm 3 , which is less than in the case of Ti 3 Al and compressive yield strength is about 700 MPa at room temperature [20,21]. Hsu et al showed that the introduction of the Al 3 Ti phase into aluminum by friction stir processing allows to obtain a composites layer with increased Young's modulus and strength [22].…”