Dislocation Loops with Stacking Fault in Quenched Aluminum

Abstract

Defects in quenched and aged aluminum of various purities are studied. Almost all dislocation loops which are formed by the vacancy condensation in pure aluminum are Frank sessile type, containing a stacking fault. The shape of the Frank sessile dislocation loops is hexagonai on {111} plane bounded by ⟨110⟩ directions. The annealing process of these dislocation loops and the change from Frank sessile dislocation loops to prismatic ones are studied experimentally. Discussions are given on the formation of Frank sessile dislocation loops and their change into prismatic dislocation loops.