Sub-surface dislocation structure of deformed copper

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Abstract
The sub-surface region of a copper single crystal which had been strain hardened in tension to the end of stage II was studied by transmission electron microscopy. Sections bounded by the original surface as well as sections further below the surface were investigated. It was found that the sub-surface dislocation structure was in agreement with flow stress distribution curves which indicate the existence of a soft surface—hard core arrangement in strain-hardened crystals.