Mechanical properties of an in situ synthesized Nb/Nb3Al layered composite

Fracture toughness and R-Curve behavior of laminated brittle-matrix composites

“…Results are compared with prior studies on Nb/Nb 3 Al composites with the Nb as ϳ20 m particulate formed in situ by powdermetallurgy processing, [15,16] or as 2-m-thick (magnetron sputtered) layers to form a microlaminate. [35,36,39] …”

Fatigue of Brittle Materials

“…To toughen intermetallics, both intrinsic and extrinsic toughening approaches have been attempted, and to varying degrees have been successful [e.g., [68][69][70]. For example, the intermetallic compound Nb 3 Al can be toughened through the addition of a ductile phase such as Nb, with the intermetallic matrix cracking preferentially to the metallic reinforcement [71][72][73]. In fact, using a high-aspect ratio reinforcement, e.g., a Nb layer in an arrester laminate, the crack-initiation toughness may be enhanced intrinsically by the necessity of the crack in the intermetallic matrix renucleating across the metal phase.…”

Mechanical properties and deformation behaviour of laminated titanium-intermetallic composites synthesised using Ti and Cu foils

“…An extensive work on the strain failure mechanism in a large range of metal-intermetallic layered composites was conducted in the early 1990's in a series of studies carried out at the U.S. Department of Energy [8,21,22]. Previous works were devoted mainly to the mechanism of damage evolution and fracture behaviour of the metal-aluminide [3,[12][13][14]16] and Cu-titanide [22,23] composites. The aim of this work was to study mechanical properties and deformation behaviour of the Ti-intermetallic laminated composites formed through in-situ reactions between Ti and Cu foils.…”

“…Furthermore, the process uses readily available elemental foils, which can easily be shaped prior to the initiation of the synthesis reaction, resulting in the potential to produce near-net-shaped composites [8]. A number of laminates have been produced in the way of intermetallic compounds synthesis using foils: Ni and Al [2,[8][9][10], Fe and Al [11], Nb and Al [12][13][14], Ti and Al [15][16][17], Ti6Al4V and Al [3,18], or Ti and Cu [19]. An extensive work on the strain failure mechanism in a large range of metal-intermetallic layered composites was conducted in the early 1990's in a series of studies carried out at the U.S. Department of Energy [8,21,22].…”

“…Among many laminate composites, the Ni-AlNi laminate has high potential for substituting Ni-based superalloys [2] and the Ti6Al4V-Al 3 Ti laminate attracts special attention for aerospace applications [3]. MIL composites can be fabricated via many different techniques: diffusion bonding [4], magnetron sputtering [5], electron beam evaporation [6], vacuum plasma spraying [7], and synthesis reactions between dissimilar elemental metal foils [2,3,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Reaction synthesis using foils has some advantages over other * Tel.…”