Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9796133 | Materials Science and Engineering: A | 2005 | 5 Pages |
Abstract
Copper specimens were severely deformed by equal channel angular pressing (ECAP) up to eight passes. The microstructure was studied by X-ray diffraction peak profile analysis as a function of strain (É). It was found that the crystallite size is reduced to a few tens of nanometers already at ÉÂ =Â 0.7 and it does not change significantly during further deformation. At the same time, the dislocation density increases gradually up to ÉÂ =Â 4. The dipole character of the dislocation structure becomes stronger with increasing strain. The thermal stability of the microstructure is examined by differential scanning calorimetry (DSC). The temperature of the DSC peak related to the recovery of the microstructure decreases with increasing strain. At the beginning of the heat release, a bimodal grain structure develops indicated by a special double-peak shape of the diffraction line profiles.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
J. Gubicza, L. Balogh, R.J. Hellmig, Y. Estrin, T. Ungár,