Effect of the grain refinement via severe plastic deformation on strength properties and deformation behavior of an Al6061 alloy at room and cryogenic temperatures

A coarse-grained (CG) Al6061 alloy after solution treatment is subjected to high pressure torsion at room temperature resulting in the formation of a homogeneous ultra-fine grained (UFG) microstructure with average grain size of 170 nm. Tensile tests are performed at room and liquid nitrogen tempera...

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Bibliographic Details
Published in:Materials letters 2011-10, Vol.65 (19), p.2917-2919
Main Authors: Moreno-Valle, E.C., Sabirov, I., Perez-Prado, M.T., Murashkin, M.Yu, Bobruk, E.V., Valiev, R.Z.
Format: Article
Language:English
Subjects:
alloys
Aluminum base alloys
Cryogenic temperatures
Deformation
Grain size
High pressure torsion
Liquid nitrogen
Mechanical properties
Metals and alloys
Microstructure
Nanocrystalline materials
nitrogen
Plastic deformation
Solution heat treatment
temperature
Torsion
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Summary:A coarse-grained (CG) Al6061 alloy after solution treatment is subjected to high pressure torsion at room temperature resulting in the formation of a homogeneous ultra-fine grained (UFG) microstructure with average grain size of 170 nm. Tensile tests are performed at room and liquid nitrogen temperatures for both CG and UFG conditions. Analysis of the surface relief of the tested specimens is performed. The effect of microstructure on the mechanical properties and on the deformation behavior of the material is discussed. ► Focuses on the grain size effect on mechanical properties of Al6061 alloy at 77 K and 298 K. ► Shows different deformation behavior of UFG Al6061 compared to that of UFG pure Al. ► Reveals larger σ y 77 K / σ y 298 K for CG Al6061 than for UFG Al6061 unlike in pure metals.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2011.06.057