Microstructure and strength of metals processed by severe plastic deformation

Gubicza, Jenő and Chinh, Nguyen Quang and Langdon, T. G. and Ungár, Tamás (2006) Microstructure and strength of metals processed by severe plastic deformation. In: Ultrafine grained materials. Minerals, Metals and Materials Society, Warrendale, pp. 231-236. ISBN 9780873396288

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Abstract

The microstructure of f.c.c. metals (Al, Cu, Ni) and alloys (Al-Mg) processed by severe plastic deformation (SPD) methods is studied by X-ray diffraction line profile analysis. It is shown that the crystallite size and the dislocation density saturate with increasing strain. Furthermore, the Mg addition promotes efficiently a reduction of the crystallite size and an increase of the dislocation density in Al during the SPD process. The yield strength correlates well with that calculated from the dislocation density using the Taylor equation, thereby indicating that the main strengthening mechanism in both pure metals and alloys is the interaction between dislocations.

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