Abstract
Stress relaxation in the polycrystalline Ti–6.5 at% Nb alloy is studied at room temperature with the grain size as a principal variable. It is observed that for a given initial stress level from which stress relaxation at constant strain rate 1.6 × 10−3 s−1 is allowed to start, the relaxation rate depends on the average grain diameter D in the range 67 to 117 μm, while it is independent of D for 612 to 751 μm. In addition, the data obtained are also analysed in terms of a single barrier model of stress relaxation. The intrinsic height of the energy barrier to the movement of relaxing dislocations is found to be 2.34 and 1.32 eV for fine-grained and coarse-grained crystals, respectively. This is of the order of magnitude for recovery processes.
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