Transition metal alloys: elastic properties and Peierls–Nabarro stresses

As an adjunct to alloying transition metals, mainly those in the second long row of the Periodic Table, with each other, published elastic properties have been analyzed and the Peierls–Nabarro (P–N) stresses computed for edge and screw dislocations. For binary alloys of Ti–Nb–Mo–Re, average tensile and shear elastic moduli, and Poissonʹs ratio were computed from the anisotropic elastic constants, cij, which are also used to compute the energy factors for dislocations. From the latter, P–N stresses were computed for dislocations on the {110} and {112} planes. Computed values are compared with experimentally derived values for Nb and Mo. On the basis of measured values, the elastic constants are estimated for a series of Nb–Cr–Ti alloys of current interest.