Abstract
The dislocation internal friction at room temperature for 99.99% pure Al with different rare-earth (RE) contents (0–3 wt %) was measured with Ke's torsion pendulum in a vacuum. A new method is presented for accurately determining the parameters of Granato-Luck plot and processing the experiment data. It was found that at room temperature the unpinning stress of dislocations and the slope of the G-L plot increase with RE content and tend to change little when RE ⩾ 0.1 %. The binding energy between RE atom and dislocation, and the lattice solubility of RE in Al at room temperature were obtained according to the dependence of unpinning strain on temperature, which are about 0.19 eV and 0.0003 wt%, respectively. The existence of solid solution RE in dislocations and the lattice was confirmed and some behaviour of RE in the interior of the Al grain mentioned in part I was also proved.
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