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Microstructural development during hot working of Mg-3AI-1Zn

journal contribution
posted on 2007-07-13, 00:00 authored by Aiden BeerAiden Beer, Matthew BarnettMatthew Barnett
he microstructural evolution is examined during the hot compression of magnesium alloy AZ31 for both wrought and as-cast initial microstructures. The influences of strain, temperature, and strain rate on the dynamically recrystallized microstructures are assessed. Both the percentage dynamic recrysallization (DRX) and the dynamically recrystallized grain size were found to be sensitive to the initial microstructure and the applied deformation conditions. Lower Z conditions (lower strain rates and higher temperatures) yield larger dynamically recrystallized grain sizes and increased percentages of DRX, as expected. The rate with which the percentage DRX increases for the as-cast material is considerably lower than for the wrought material. Also, in the as-cast samples, the percentage DRX does not continue to increase toward complete DRX with decreasing Z. These observations may be attributed to the deformation becoming localized in the DRX fraction of the material. Also, the dynamically recrystallized grain size is generally larger in as-cast material than in wrought material, which may be attributed to DRX related to twins and the inhomogeneity of deformation. Orientation maps of the as-cast material (from electron backscattering diffraction (EBSD) data) reveal evidence of discontinuous DRX (DDRX) and DRX related to twins as predominant mechanisms, with some manifestation of continuous DRX (CDRX) and particle-stimulated nucleation (PSN).

History

Journal

Metallurgical and materials transactions A-physical metallurgy and materials science

Volume

38A

Issue

8

Pagination

1856 - 1867

Publisher

Springer Boston

Location

Boston, Mass.

ISSN

1073-5623

eISSN

1543-1940

Language

eng

Publication classification

C1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2007, Springer