Precipitation microstructure of ultrafine-grained Al-Zn-Mg alloys processed by severe plastic deformation

Gubicza, Jenő and Schiller, I. and Chinh, Nguyen Quang and Illy, J. (2007) Precipitation microstructure of ultrafine-grained Al-Zn-Mg alloys processed by severe plastic deformation. In: MATERIALS SCIENCE, TESTING AND INFORMATICS III. Materials Science Forum (537-38). Trans Tech Publications, Zürich, pp. 169-176. ISBN 978-0-87849-426-2

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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.

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