Abstract
The longitudinal diffusion equation of the solute atom along dislocation core for P′1 peak is numerically solved and the P′1 peak is derived on the base of dislocation kink atmosphere model. The variation of internal friction and modulus defects with temperature and strain amplitude is calculated. The theoretical and experimental results are compared and found to be in consistence with each other. Therefore, the P′1 peak can be quantitatively explained.
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