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

Abstract:

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.

• Periodical: Materials Science Forum (Volumes 537-538)
• Pages: 169-176
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.537-538.169
• Online since: February 2007
• Authors: Jenő Gubicza, I. Schiller, Quang Chinh Nguyen, Judit Illy
• Keywords: Dislocation Density, Equal-Channel Angular Pressing (ECAP), Precipitation, Supersaturated Al-Zn-Mg Alloys, X-Ray Diffraction Line Profile Analysis

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