Abstract
Abstract The effect of silicon and oxygen in solid solution on the damping of iron (vibrating at 1·03 c.p.s.) has been studied. The damping is independent of vibrational amplitude up to a critical amplitude. The variation of this critical amplitude with temperatures and solute concentration has been studied. From the temperature variation of the critical amplitude a binding energy of 0·004 ev between a silicon atom and a dislocation has been obtained. Above the critical amplitude, the damping varies with amplitude of vibration. This variation has been compared with that deduced by Granato and Lucke's (1956) model for mechanical damping due to dislocations.
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