Abstract
The density and distribution of dislocations in three dilute alloys of tantalum containing oxygen, nitrogen and carbon have been determined by transmission electron microscopy after 90% cold work and subsequent annealing between 900° and 1,750°C. Annealing below 1,200°C results in a marked decrease in the dislocation density and the formation of regular arrays of dislocations in sub-boundary networks. Above 1,200°C the sub-boundaries are removed. The changes are sensitive to impurity content. The geometry of dislocations in regular networks have been studied using a stereographic method. Over 60% of the networks examined were probably formed by the intersection of two parallel sets of a 2 〈 III 〉 dislocations.
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