The microstructures of as-annealed Laves phase NbCr2 containing 5at%V exhibited neither micro-twins nor stacking faults, in contrast to binary NbCr2. The stacking-fault energy in NbCr2 containing 5at%V was evaluated to be approximately 29mJ/m2. The strain-rate dependence of the flow stress and deformed microstructures for NbCr2 containing 5at%V at 1623K suggested that the deformation was controlled by the glide and climb of dislocations (with a Burgers vector of ½<011>). No evidence for the activation of mechanical twinning was obtained. The effect of V additions on the microstructures before and after deformation of NbCr2 were explained from the viewpoint of the phase stability of the C15 structure, compared to the C14 structure.

TEM Observation for Deformation Microstructure of Laves Phase NbCr2 Containing V. M.Yoshida, T.Takasugi: Materials Science and Engineering A, 2003, 345[1-2], 350-6