Low-temperature dynamic precipitation in a supersaturated Al-Zn-Mg alloy and related strain hardening

A. Deschamps, M. Niewczas, F. Bley, Y. Brechet, J. D. Embury, L. Le Sinq, F. Livet, J. P. Simon

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Abstract

Dynamic precipitation during low-temperature deformation of a supersaturated Al-Zn-Mg alloy has been studied by small-angle X-ray scattering and in-situ resistivity in the temperature range 4.2-300 K. At 300 K, dynamic precipitation is observed both for the material strained in the form of a solid solution and for the material strained in the partially aged state, that is containing Guinier-Preston (GP) zones; In the first case, dynamic precipitation occurs by nucleation of precipitates 5 Ǻ in diameter, and in the second case it occurs by coarsening of existing precipitates. In all cases the dynamic precipitation results in an unusual-strain hardening behaviour in which the work-hardening rate is very high and essentially temperature independent.

Original languageEnglish
Pages (from-to)2485-2504
Number of pages20
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume79
Issue number10
DOIs
Publication statusPublished - Oct 1999
Externally publishedYes

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