Deformation mechanism in B2 ordered matrix composites

The deformation mechanisms which cause the increase in strength achieved by adding TiB2 particles, Al2O2 particles or whiskers to NiAl, and to recognize the principles of the deformation process in NiAl matrix composites are investigated. Mechanical properties and thermal activation parameters in NiAl matrix composites with different types, shapes and sizes of reinforcements were systematically evaluated. It was found that the size of the reinforcement had a large influence on the mictrostructures of the composites and the nominal activation energies for all the composites were the same and within the range of the activation energy of self-diffusion for pure NiAl.