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Grain boundary mobility has been measured in high-purity aluminum alloyed with 0.03 wt.% Zr using energy stored during plastic deformation as a driving force. In general, the dependence of mobility on grain boundary character was similar to that observed by previous authors with a maximum in mobility in the vicinity of the ∑7 type (38°&lt;111&gt;). The exact location of the mobility maximum varied, however, with temperature in a manner similar to that observed for curvature-driven mobility measurements. Although &lt;111&gt; tilt boundaries exhibit high mobilities in general, the single peak at the ∑7 position at low temperatures changes to a double peak at high temperatures with a local minimum at ∑7. The combination of mobility variation and the thermal activation analysis of the results points to a compensation temperature effect. All these results suggest that grain boundary mobility is a true material property.

Grain boundary mobility under a stored-energy driving force: a comparison to curvature-driven boundary migration