An investigation on the microstructure, texture and mechanical properties of an optimized friction stir-welded ultrafine-grained Al–0.2 wt% Sc alloy deformed by accumulative roll bonding

In this paper, an ultrafine-grained (UFG) Al–0.2 wt% Sc sheet was fabricated by accumulative roll bonding and welded by applying friction stir welding (FSW) process. Additionally, welding process parameters were optimized using Taguchi optimization technique. Microstructural and textural characteriz...

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Bibliographic Details
Published in:Journal of materials science 2018-03, Vol.53 (6), p.4623-4634
Main Authors: Yousefieh, Mohammad, Tamizifar, Morteza, Boutorabi, Seyed Mohammad Ali, Borhani, Ehsan
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Deformation
Distribution functions
Electron backscatter diffraction
Friction stir welding
Grain structure
Investigations
Materials Science
Mechanical properties
Metals
Microstructure
Optimization
Optimization techniques
Optimization theory
Polymer Sciences
Process parameters
Recrystallization
Roll bonding
Scandium
Solid Mechanics
Ultrafines
Variance analysis
Welding
Welding parameters
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Summary:In this paper, an ultrafine-grained (UFG) Al–0.2 wt% Sc sheet was fabricated by accumulative roll bonding and welded by applying friction stir welding (FSW) process. Additionally, welding process parameters were optimized using Taguchi optimization technique. Microstructural and textural characterizations were performed by scanning electron microscope equipped with electron backscattered diffraction. Analysis of variance and Taguchi results demonstrated that tool rotational speed had the highest statistical influence ( P  = 60.08%) on mechanical properties. Confirmation test as was performed to verify the optimum FSW parameters also showed that the error between the estimated value of the maximum hardness and its experimental value was 1.99%. As a result, FSW was demonstrated to be highly beneficial for the retention of the UFG microstructure as well as high mechanical properties in the ARB-processed specimen. The orientation distribution function (ODF) results were in good agreement with the generated strain during the FSW process. The microstructural and textural (ODF) results showed that a well-recrystallized equi-axed grain structure having a combination of the B / B ¯ and C simple-shear textures was finally developed in the stir zone of the optimized welding specimen.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-1897-5