Influence of Severe Plastic Deformation on Precipitation Hardening in an Al-Mg-Si Alloy: Microstructure and Mechanical Properties

Meng-Shan Tsai; Pei-Ling Sun; Po-We Kao; Chih-Pu Chang

doi:10.2320/matertrans.MRA2008468

Meng-Shan Tsai, Pei-Ling Sun, Po-We Kao, Chih-Pu Chang

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Keywords: aging, precipitation, mechanical properties, aluminum alloy, equal channel angular extrusion

JOURNAL FREE ACCESS

2009 Volume 50 Issue 4 Pages 771-775

DOI https://doi.org/10.2320/matertrans.MRA2008468

View "Advance Publication" version (March 18, 2009).

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Abstract

Equal channel angular extrusion (ECAE) is applied to an age-hardening Al-Mg-Si alloy at temperatures where concurrent aging (dynamic aging) can occur to form fine β″-Mg₂Si precipitates, and an ultrafine-grained matrix with high dislocation density can be maintained. This microstructure results in significant strength enhancement with little sacrifice in tensile ductility. The large plastic strain imposed by ECAE causes a fraction of the precipitates to dissolve into the aluminum matrix, which re-precipitate during subsequent aging treatment.

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