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Metals 2015, 5(2), 578-590; doi:10.3390/met5020578

Fatigue Behavior of an Ultrafine-Grained Al-Mg-Si Alloy Processed by High-Pressure Torsion

1
Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia
2
Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, Saint-Petersburg 199034 Russia
3
IMDEA Materials Institute, Getafe, Madrid 28906, Spain
4
Baikov Institute for Metallurgy and Materials Science of the Russian Academy of Sciences, Moscow 119991, Russia
5
Research Laboratory for Mechanics of New Nanomaterials, St. Petersburg State Polytechnical University, Saint-Petersburg 195251, Russia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 24 March 2015 / Revised: 30 March 2015 / Accepted: 31 March 2015 / Published: 10 April 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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Abstract

The paper presents the evaluation of the mechanical and fatigue properties of an ultrafine-grained (UFG) Al 6061 alloy processed by high-pressure torsion (HPT) at room temperature (RT). A comparison is made between the UFG state and the coarse-grained (CG) one subjected to the conventional aging treatment Т6. It is shown that HPT processing leads to the formation of the UFG microstructure with an average grain size of 170 nm. It is found that yield strength (σ0.2), ultimate tensile strength (σUTS) and the endurance limit (σf) in the UFG Al 6061 alloy are higher by a factor of 2.2, 1.8 and 2.0 compared to the CG counterpart subjected to the conventional aging treatment Т6. Fatigue fracture surfaces are analyzed, and the fatigue behavior of the material in the high cycle and low cycle regimes is discussed. View Full-Text
Keywords: Al alloy; severe plastic deformation; high pressure torsion; ultrafine-grained microstructure; mechanical strength; fatigue properties Al alloy; severe plastic deformation; high pressure torsion; ultrafine-grained microstructure; mechanical strength; fatigue properties
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Murashkin, M.; Sabirov, I.; Prosvirnin, D.; Ovid'ko, I.; Terentiev, V.; Valiev, R.; Dobatkin, S. Fatigue Behavior of an Ultrafine-Grained Al-Mg-Si Alloy Processed by High-Pressure Torsion. Metals 2015, 5, 578-590.

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