Structural evolution of Ni3Al-based intermetallic compounds during tensile or cold-rolling deformations

The influence of plastic deformation on the evolution of long-range ordered (LRO) intermetallic compounds was investigated in boron-doped Ni76Al24 and Ni76Al20Ti4. Electrical resistivity measurements were used to evaluate (a) the modifications of cristallographic order due to the production of lattice defects and (b) the modifications of chemical order due to disordering induced by the deformation. An analytical relationship was established to represent these two contributions to the resistivity changes. Its application to the results of cold-rolling experiments shows that disordering by deformation is much less effective in these long-range ordered materials than in a previouly investigated short-range ordered alloy. (orig.)