Title: Microstructural behaviour of hot deformed AA 6015 alloy

Authors: E . Evangelista, A. Forcellese, F . Gabrielli, P. Mengucci

Addresses: Department of Mechanics, University of Ancona, Via Brecce Bianche, I-60131 Ancona, Italy. ' Department of Mechanics, University of Ancona, Via Brecce Bianche, I-60131 Ancona, Italy. ' Department of Mechanics, University of Ancona, Via Brecce Bianche, I-60131 Ancona, Italy. ' Department of Mechanics, University of Ancona, Via Brecce Bianche, I-60131 Ancona, Italy

Abstract: The hot workability of AA 6015 alloy has been studied by means of torsion tests over the temperature range 300-500°C and strain rate of 0.1 s−1. The ductility was very low at 300-350°C but attained large values at higher temperatures. Optical microscopy showed original grains partially elongated up to 350°C and recrystallized grains at higher temperatures. Electron metallography revealed a distribution of fine Mg2Si precipitates with unrecovered structures at lower temperatures and well defined subgrain with the presence of large Mg2Si particles at temperatures higher than 400°C. The effect of precipitate size on dynamic restoration was analysed.

Keywords: aluminium alloys; dynamic recovery; recrystallization; hot workability; microstructure; hot working; torsion tests; deformation.

DOI: 10.1504/IJMPT.1990.036610

International Journal of Materials and Product Technology, 1990 Vol.5 No.1, pp.84 - 94

Published online: 05 Nov 2010 *

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