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An investigation of the purification of cerium in aluminium by the method of internal friction

In this letter, the relation between the purification effect and measurements of internal friction is established, including the grain boundary and dislocation internal friction. Corresponding internal frictions were measured for 4N pure aluminium samples with cerium content 0-0.1 wt.% (four in number) in Ke's vacuum torsion pendulum. From the changes of the grain boundary internal friction peak height, the unpinning stress, and the slope of the GL plot with Ce content; it has been shown that there are different Ce purification effects in the grain boundary and in the interior of the grain of Al; a small amount of Ce (<0.01%) has a significant purification effect, but somewhat higher Ce content will decrease this effect because of segregation, especially in the grain boundary.