Grain refinement and mechanical behavior of a magnesium alloy processed by ECAP

Equal-channel angular pressing (ECAP) is an effective tool for refining the grain structure of magnesium alloys and improving the ductility at moderate temperatures. However, grain refinement in these alloys differs from other metals because new grains are formed along the boundaries of the initial...

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Bibliographic Details
Published in:Journal of materials science 2010-09, Vol.45 (17), p.4827-4836
Main Authors: Figueiredo, Roberto B., Langdon, Terence G.
Format: Article
Language:English
Subjects:
Alloys
Analysis
Boundaries
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Dynamic recrystallization
Equal channel angular pressing
Grain refinement
Grain size
Grain structure
Grains
Magnesium alloys
Magnesium base alloys
Material properties
Materials Science
Mechanical properties
Polymer Sciences
Solid Mechanics
Specialty metals industry
Twin boundaries
Ultrafine Grained Materials
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Summary:Equal-channel angular pressing (ECAP) is an effective tool for refining the grain structure of magnesium alloys and improving the ductility at moderate temperatures. However, grain refinement in these alloys differs from other metals because new grains are formed along the boundaries of the initial structure and these newly formed grains slowly spread to consume the interiors of the larger grains in subsequent passes. A model is presented for grain refinement in magnesium alloys processed by ECAP based on the principles of dynamic recrystallization where new fine grains are formed along the initial boundaries and along twin boundaries. This model provides an explanation for a wide range of experimental data and introduces the concept of grain size engineering for achieving selected material properties in magnesium alloys.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-010-4589-y