Cracking in Cr–Cr2Nb eutectic alloys due to thermal stresses

Effect of Mo, Al and Si on the microstructure and mechanical properties of Cr–Cr 2 Ta based alloys

“…6(b)). In a study on a Cr-Cr 2 Nb alloy, Lee et al [48] identified that any interface between the Cr-rich and intermetallic phase, either in the eutectic mixture or within the Cr-rich phase with embedded Cr 2 Ta particles may act as potential sites for nucleation of cracks and their easy path of propagation. This was attributed to the difference in deformation behaviour of these phases and the stress concentrations that result at these interfaces.…”

Microstructure and fracture toughness of Cr/Cr2Nb alloys with trace Y addition

“…Such an approach has been demonstrated effective in improving the RT brittleness of Cr 2 Nb Laves phase. [7][8][9] However, the fracture mode of Cr 2 Nb based alloys indicates that the Cr 2 Nb primary dendrites and lamellar eutectic interface are the worst places to fracture. [10][11][12][13] Thus, any potential of improving the intrinsic brittleness of Cr 2 Nb Laves phase or the lamellar eutectic bonding strength is beneficial to the improvement of RT properties.…”

“…Efforts in toughening the monolithic Cr 2 Nb Laves phase have been unsuccessful so far, with most work focusing on ductilising Cr 2 Nb by ternary elements addition, such as Ti, Zr, V and Si. 3,7,[10][11][12][13][14][15] Considering that the rare earth elements (REEs) can increase the interface bonding strength by purifying the interface, the REE Y was added in the Cr 2 Nb Laves phase, and the results indicated that the addition of 0.1 at-% yttrium is beneficial to the improvement of RT fracture toughness. 6 Moreover, REEs can refine the microstructure, which is also beneficial to the improvement of RT properties.…”

“…Such an approach has been demonstrated effective in improving the RT brittleness of Cr 2 Nb Laves phase. 7–9…”

First-principles study of the ideal cleavage fracture of Cr2Nb microalloyed by X (Al, Ni, Co, Ti)

“…Kazantzis et al [8] and Morais Smith et al [9] investigated the stacking-fault energy, the high temperature mechanical properties and the deformation mechanisms of the Cr 2 Nb, respectively. Lee et al [10] studied the cracking in Cr-Cr 2 Nb eutectic alloys due to thermal stresses. The microstructure and mechanical properties of Cr 2 Nb with the additive elements X (Re, Al, Ni, Co, V, Mo and Ti) have also been studied [11][12][13].…”