Versetzungsstruktur und verfestigung von [100]-kupfereinkristallen

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Abstract
DISLOCATION STRUCTURE AND WORK-HARDENING OF COPPER SINGLE CRYSTALS WITH [100] AXIS ORIENTATION I. DISLOCATION ARRANGEMENT AND CELL STRUCTURE OF CRYSTALS DEFORMED IN TENSION Copper single crystals with [100] axis orientation are deformed in tension at room temperature and after load-removal are irradiated with neutrons to stabilize the dislocation arrangement before the preparation of thin foils. TEM investigations of {111}-, {110}- and {100}-foils and the analysis of Burgers vectors and lino vectors yield the essential information about the dislocation arrangement. A cell structure is observed which is, in principle, the same in all stages of deformation. This cell structure consists of nearly dislocation free regions of varying sizes surrounded by walls of dislocation networks without preferred orientation. The most important parameters of this dislocation structure are measured as a function of stress: Dislocations of all 6 Burgers vectors—including those which do not operate under the external stress—occur with equal frequency. The same is true for the different characters of dislocations. Total dislocation density ρ: τ = 0·30 Gb√rH. Mean diameter of cells D = 4·2 Gb/τ. Ratio of dislocation free areas to the total area of the glide plane p(τ) = 0·55 = constant. The average diameter of the walls is nearly proportional to 1/τ. The results are compared with other measurements.