Influence of texture and grain size on work hardening and ductility in magnesium-based alloys processed by ECAP and rolling

Equal channel angular pressing (ECAP) and large-strain hot rolling (LSHR) are widely used methods for refining the grain size in magnesium alloys. The hardening capability of the processed materials confers the resistance to develop tensile mechanical instabilities, therefore controlling ductility....

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Bibliographic Details
Published in:Acta materialia 2006-09, Vol.54 (16), p.4247-4259
Main Authors: del Valle, J.A., Carreño, F., Ruano, O.A.
Format: Article
Language:English
Subjects:
Applied sciences
Dynamics
ECAP
Equal channel angular pressing
Exact sciences and technology
Grain size
Hot rolling
Magnesium alloys
Magnesium base alloys
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Plastic deformation
Severe plastic deformation
Surface layer
Texture
Work hardening
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Summary:Equal channel angular pressing (ECAP) and large-strain hot rolling (LSHR) are widely used methods for refining the grain size in magnesium alloys. The hardening capability of the processed materials confers the resistance to develop tensile mechanical instabilities, therefore controlling ductility. In this work various magnesium alloys were processed using ECAP, LSHR and annealing treatments in order to control the texture and the grain size. Emphasis was laid upon the influence of these factors on work hardening behavior and dynamic recovery. In addition to the direct effect of texture through the change in the orientation factor for basal and prismatic slip, effects were found on dynamic recovery and the appearance of stage II of work hardening. The grain size refinement causes a strong decrease in the hardening rate. A contribution of grain boundary sliding to deformation gives a plausible explanation of these results.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2006.05.018