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This article deals with investigation of fine-scale precipitation in Al-Mg-Zn alloys with compositions of Al - 2 at% Mg- x at% Zn, x = 1.8, 2 and 4.2. The precipitates morphology was examined by scanning electron microscope SEM and correlated with the microhardness HV and differential scanning calorimetry DSC of the specimens. The precipitates are characterized as h’ MgZn2 and h MgZn2 phases of hexagonal structure of the same composition with a slight difference in lattice parameters. In addition, T-phase pf composition Mg32 Al, Zn49 having a cubic crystal structure. Owing to the determined activation energies of the precipitates, the kinetics associated with their nucleation and growth can be characterized. The thermal energy acquired during aging leads to the agglomeration of precipitates to or larger particle sizes.

KEYWORDS

Al-Mg-Zn Alloys, Coherent Precipitates, Aging, Microhardness, Scanning Electron Microscopy, Precipitation Kinetics

Cite this paper

N. Afify, A. Gaber and G. Abbady -Fine Scale Precipitates in Al-Mg-Zn Alloys after Various Aging Temperatures,- Materials Sciences and Applications, Vol. 2 No. 5, 2011, pp. 427-434. doi: 10.4236-msa.2011.25056.





Autor: Nasser Afify, Abdel-Fattah Gaber, Ghada Abbady

Fuente: http://www.scirp.org/



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