Anisotropy of Snoek relaxation in a highly textured Ti–Nb–O β-Ti alloy

Snoek relaxation behavior of a Ti–25.2Nb–0.6O at. % alloy, which is processed to have an intensified normal plane∥{112} texture, is investigated on three specimens with specific crystalline orientations along the flexure vibration stressing direction. In the case of rolling direction specimen, the Snoek relaxation peak temperature is 473.5 K, the activation energy is 1.51 eV, and the peak broadness parameter r2(β) is 1.96. While all those factors show only slight variation with the change in specimen orientation, the deduced relaxation strength, QP−1/f2(0,β) changes linearly with the average orientation parameter Γ of the specimens. Considering that the observed Snoek relaxation peak can be modeled by a continuous spectrum, we get a dipole shape factor of 0.42 for the alloy with the average orientation parameters calculated by the optimized sampling grain approximation method.

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