On the Structure and Mechanical Properties of Multilayered Composite, Obtained by Explosive Welding of High-Strength Titanium Alloys

Abstract

One of the ways to simultaneously increase the strength and the fracture and impact toughness of structural materials is by producing multilayered materials. In this paper we discuss the structure and properties of a seven-layer composite obtained by explosive welding of high-strength titanium alloys. The structure of the composite was characterized using light microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). At the interfaces between plates, formation of waves and vortices was observed. The wave formation is discussed with respect to the kinetic energy loss. The vortices consisted of a mixture of two alloys and possessed a martensitic structure comprising α and β phases of titanium. Localized plastic deformation occurred along the interfaces during explosive welding by formation of shear bands. The most intensive shear banding occurred in the vicinity of the upper interfaces. The local hardness at the interfaces increased due to the formation of the quenched structures. The interfaces between titanium alloys positively influenced the impact toughness of the composite, which increased in comparison with that of bulk titanium alloys by a factor of 3.5. The strength characteristics of the composite remained at the same level as that of the bulk material (1100-1200 MPa).

Structural Transformations at the Interface of Explosively Welded Al and Ti: Experimental Research and Numerical Simulation

“…It is associated with the fact that explosively welded bimetals and multilayer composites based on titanium and aluminum can be used as semi-finished products to produce metal-intermetallic laminated (MIL) composites. Composites of this type have high specific stiffness and sufficiently high fracture toughness [5][6][7][8]. A unique set of mechanical properties makes composite materials based on Al-Ti promising for aircraft [2].…”

Structure and Properties of High-Strength Titanium Alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr Welded Joints

“…Intensive work is underway in leading material science centers in the USA, EU, Russia, and China, both to modernize existing titanium alloys and to create new ones [1][2][3][4][5][6][7]. Extensive research is also underway to study the weldability of titanium alloys [8][9][10][11][12][13][14][15] and their practical application in various fields [16][17][18][19][20][21][22][23][24][25]. The E.O.…”