On the influence of dislocations on precipitation in an Al-Zn-Mg alloy

A. Deschamps, Y. Bréchet, P. Guyot, F. Livet

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Abstract

The influence of predeformation on the precipitation and on the resulting mechanical properties in an Al-Zn-Mg alloy was studied using a combination of complementary experimental techniques, namely transmission electron microscopy, differential scanning calorimetry, small-angle X-ray scattering and microhardness. The thermomechanical treatment was designed to show a significant effect of deformation on the precipitation process. It was observed that the presence of dislocations during precipitation promoted fast nucleation of the equilibrium η phase in the η2 orientation instead of nucleation of the η′ phase with subsequent transformation to η1 and η4 outside dislocations. The large growth rate of precipitates lying on dislocations provoked a growing precipitate-free zone around dislocations. This resulted in a lower value of peak hardness and a faster overall coarsening kinetics.

Original languageEnglish
Pages (from-to)601-606
Number of pages6
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume88
Issue number8
Publication statusPublished - Aug 1997
Externally publishedYes

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