Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

Grain boundary (GB) segregations were investigated by atom probe tomography in an Al–Mg alloy, a carbon steel and Armco® Fe processed by severe plastic deformation (SPD). In the non‐deformed state, the GBs of the aluminum alloy are Mg depleted, but after SPD some local enrichment up to 20 at% was de...

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Bibliographic Details
Published in:Advanced engineering materials 2012-11, Vol.14 (11), p.968-974
Main Authors: Sauvage, Xavier, Ganeev, Artur, Ivanisenko, Yulia, Enikeev, Nariman, Murashkin, Maxim, Valiev, Ruslan
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Carbon
Condensed Matter
Grain boundary segregation
Iron
Materials Science
Physics
Plastic deformation
Segregations
Tomography
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Summary:Grain boundary (GB) segregations were investigated by atom probe tomography in an Al–Mg alloy, a carbon steel and Armco® Fe processed by severe plastic deformation (SPD). In the non‐deformed state, the GBs of the aluminum alloy are Mg depleted, but after SPD some local enrichment up to 20 at% was detected. In the Fe‐based alloys, large carbon concentrations were also exhibited along GBs after SPD. These experimental observations are attributed to the specific structure of GBs often described as “non‐equilibrum” in ultra fine grained materials processed by SPD. The GB segregation mechanisms are discussed and compared in the case of substitutional (Mg in fcc Al) and interstitial (C in bcc Fe) solute atoms. Grain boundary segregations were investigated by atom probe tomography both in an ultrafine grain steel and in an aluminum alloy processed by severe plastic deformation. The unusually high solute concentrations that were measured are attributed to the “non‐equilibrium” state of the boundaries. The mechanisms of these deformation induced segregations are discussed.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.201200060