Precipitation Microstructure of Ultrafine-Grained Al-Zn-Mg Alloys Processed by Severe Plastic Deformation

Abstract:

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Supersaturated Al-4.8Zn-1.2Mg-0.14Zr and Al-5.7Zn-1.9Mg-0.35Cu (wt.%) alloys were processed by Equal-Channel Angular Pressing (ECAP) at 200°C. The crystallite size distribution and the characteristic parameters of the dislocation structure of both Al matrix and precipitates were determined by X-ray diffraction line profile analysis, which has been complemented by transmission electron microscopy (TEM) observations. Results of these investigations show that the bulk ultrafine-grained microstructure with high dislocation density produced by ECAP has strong influence on the precipitation process, resulting in high strength in both alloys.

Info:

Periodical:

Materials Science Forum (Volumes 537-538)

Edited by:

J. Gyulai and P.J. Szabó

Pages:

169-176

DOI:

10.4028/www.scientific.net/MSF.537-538.169

Citation:

J. Gubicza et al., "Precipitation Microstructure of Ultrafine-Grained Al-Zn-Mg Alloys Processed by Severe Plastic Deformation ", Materials Science Forum, Vols. 537-538, pp. 169-176, 2007

Online since:

February 2007

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$35.00

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