Using sphere-plate models made from copper it is shown that during sintering the dislocation density increases considerably in the contact region. Its distribution and time dependent variation can be analysed by means of the Rossel technique and described quantitatively. The same effect is observed during sintering compacts of electrolytic copper powder. The results of positron annihilation spectroscopy show the high dislocation densities generated in the heating phase to be reduced by non-conservative dislocation movement during the intensive shrinkage stage of sintering. Resulting densification mechanisms are discussed. PM/0344
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