On the Grain Refinement Mechanisms in SPD – Applying High Resolution Electron Microscopy and the LEDS Approach

Jens C. Werenskiold; Hans Jørgen Roven

doi:10.4028/www.scientific.net/MSF.503-504.45

Paper Titles

Developing a Model for Grain Refinement in Equal-Channel Angular Pressing
p.19

Effect of Initial Grain Size, Die Angle and Pass Sequence on the Formation of Ultrafine Grain Structure in Cu by ECAP
p.25

Local Investigations of the Mechanical Properties of Ultrafine Grained Metals by Nanoindentations
p.31

The Positive Role of Back-Pressure in Equal Channel Angular Extrusion
p.37

On the Grain Refinement Mechanisms in SPD – Applying High Resolution Electron Microscopy and the LEDS Approach
p.45

On the Microstructure of HPT Processed Cu under Variation of Deformation Parameters
p.51

Deformation Induced Vacancies with Severe Plastic Deformation: Measurements and Modelling
p.57

Influence of Processing Parameters on Texture and Microstructure in Aluminum after ECAP
p.65

Processing of Ultrafine-Grained Cu-Fe-Cr Composite by Equal Channel Angular Pressing
p.71

HomeMaterials Science ForumMaterials Science Forum Vols. 503-504On the Grain Refinement Mechanisms in SPD –...

On the Grain Refinement Mechanisms in SPD – Applying High Resolution Electron Microscopy and the LEDS Approach

Abstract:

The present work is an attempt to contribute the current understanding of the operating mechanisms responsible for the development of ultrafine grains during severe plastic deformation (SPD) in aluminium. Equal channel angular pressing (ECAP) at room temperature has been applied to a commercial Al-Mg-Si alloy. Route A was used in all pressings and the first two passes were studied in most detail. Advanced characterization methods such as FEG-SEM with a state-of-the-art microdiffraction unit has been applied when characterizing samples carefully prepared from different positions along certain flow paths in the process shear zone. Intrinsic strain measurements are done in parallel in order to describe the actual strain tensor in each position studied. Detailed information on phenomena involved in the grain break-up mechanisms has been obtained by high resolution EBSD data collected through the deformation zone. The microstructural development seems to be dominated by deformation banding and may be explained in terms of the LEDS theory.

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Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

45-50

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.45

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Online since:

January 2006

Authors:

Jens C. Werenskiold, Hans Jørgen Roven

Keywords:

Equal-Channel Angular Pressing (ECAP), Grain Refinement Mechanism, Light Emitting Diode (LED), Severe Plastic Deformation (SPD), Ultrafine Grained

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References

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