Abstract
On the basis of the dislocation kink atmosphere model, the relaxation time and the relaxation strength associated with the longitudinal and transverse core diffusion of solute atoms under quasi-static stress have been computed by solving the diffusion equation. It was found that the relaxation time and the relaxation strength are nonlinear with respect to the applied stress. Analytical expressions for internal friction and modulus defect associated with longitudinal and transverse core diffusion were obtained by assuming the relaxation process to be nearly of Debye type with nonlinear relaxation time and relaxation strength. The manifestations of the theoretical internal friction curves versus temperature and strain amplitude conform to experimental results.
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