Elastic constants of niobium-molybdenum alloys in the temperature range −190 to +100°C

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Abstract
The adiabatic elastic constants were determined for niobium and niobium‐molybdenum alloys of the following nominal compositions: 15, 25, 35, 50, 75, and 90 wt.% Mo. The c11, c12, and c44 elastic constants of these bcc alloys were tabulated between −190 and +100°C. The effects of compositional changes on the elastic constants were far greater than those due to temperature. An anomalous temperature dependence for c44 was found for the niobium‐rich alloys. An analysis of the elastic constants in terms of central forces revealed that nearest‐and second‐nearest‐neighbor force constants rise with molybdenum additions, with the latter tending towards a maximum as the composition of pure molybdenum is approached. This is thought to be associated with the filling of a d subband. The Debye temperatures were computed and found to be generally in good agreement with the calorimetrically determined values reported in the literature.