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An analysis of microband orientation in hot deformed aluminium alloy AA5052 using forward and reverse torsion

journal contribution
posted on 2006-01-01, 00:00 authored by M Lopez-Pedrosa, B Wynne, W Rainforth, Pavel CizekPavel Cizek
The effects of strain path reversal on the macroscopic orientation of microbands in AA5052 have been studied using high resolution electron backscatter diffraction. Deformation was carried using two equal steps of forward/forward or forward/reverse torsion at a temperature of 300°C and strain rate of 1s-1 to a total equivalent tensile strain of 0.5. In both cases microbands were found in the majority of grains examined with many having more than one set. The microbands appear to cluster at specific angles to the macroscopic deformation. For the forward/forward condition microbands clustered around -20° and +45° to the maximum principle stress direction and at ± 30-35° to the principal strain direction. For the forward/reverse condition significantly more spread in microband angle was observed though peaks were visible at ±35° with respect to principal stress direction and at -40° and +30° with respect to the principal strain direction of the reverse torsion. This suggests the microbands formed in the forward deformation have or are dissolving and any new microbands formed are related to the deformation conditions of the final strain path.

History

Journal

Materials science forum

Volume

519

Issue

521

Pagination

877 - 882

Publisher

Trans Tech

Location

Stafa-Zurich, Switzerland

ISSN

0255-5476

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2006, Trans Tech Publications, Switzerland

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