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

Metals

Maxim Murashkin⁴  Ilchat Sabirov¹  Dmitriy Prosvirnin³  Ilya Ovid'ko²  Vladimir Terentiev³  Ruslan Valiev⁴  Sergey Dobatkin³ 

[1]IMDEA Materials Institute, Getafe, Madrid 28906, Spain

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[3]Research Laboratory for Mechanics of New Nanomaterials, Saint-Petersburg State Polytechnical University, Saint-Petersburg 195251, Russia

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[5]Baikov Institute for Metallurgy and Materials Science of the Russian Academy of Sciences, Moscow 119991, Russia

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[7]Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia

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关键词: Al alloy;    severe plastic deformation;    high pressure torsion;    ultrafine-grained microstructure;    mechanical strength;    fatigue properties;   

DOI  :  10.3390/met5020578

来源: mdpi

【 摘 要 】

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 (σ_0.2), ultimate tensile strength (σ_UTS) and the endurance limit (σ_f) 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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.