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December 2017, Page 81-160
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Rezaei, M., Toroghinezhad, M., Ashrafizadeh, F. (2017). Analysis of Strengthening Mechanisms in an Artificially Aged Ultrafine Grain 6061 Aluminum Alloy. Journal of Ultrafine Grained and Nanostructured Materials, 50(2), 152-160. doi: 10.22059/JUFGNSM.2017.02.10
Mohammad Reza Rezaei; Mohammadreza Toroghinezhad; Fakhreddin Ashrafizadeh. "Analysis of Strengthening Mechanisms in an Artificially Aged Ultrafine Grain 6061 Aluminum Alloy". Journal of Ultrafine Grained and Nanostructured Materials, 50, 2, 2017, 152-160. doi: 10.22059/JUFGNSM.2017.02.10
Rezaei, M., Toroghinezhad, M., Ashrafizadeh, F. (2017). 'Analysis of Strengthening Mechanisms in an Artificially Aged Ultrafine Grain 6061 Aluminum Alloy', Journal of Ultrafine Grained and Nanostructured Materials, 50(2), pp. 152-160. doi: 10.22059/JUFGNSM.2017.02.10
Rezaei, M., Toroghinezhad, M., Ashrafizadeh, F. Analysis of Strengthening Mechanisms in an Artificially Aged Ultrafine Grain 6061 Aluminum Alloy. Journal of Ultrafine Grained and Nanostructured Materials, 2017; 50(2): 152-160. doi: 10.22059/JUFGNSM.2017.02.10

Analysis of Strengthening Mechanisms in an Artificially Aged Ultrafine Grain 6061 Aluminum Alloy

Article 10, Volume 50, Issue 2, December 2017, Page 152-160  XML PDF (1.17 MB)
Document Type: Research Paper
DOI: 10.22059/JUFGNSM.2017.02.10
Authors
Mohammad Reza Rezaei email orcid 1; Mohammadreza Toroghinezhad2; Fakhreddin Ashrafizadeh2
1School of Engineering, Damghan University, Damghan, Iran.
2Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
Abstract
The current study adopted a quantitative approach to investigating the mechanical properties, and their relationship to the microstructural features, of precipitation-strengthened 6061 aluminum alloy processed through accumulative roll bonding (ARB) and aging heat treatment.  To serve this purpose, the contributions of different strengthening mechanisms including grain refinement, precipitation, dislocation and solid-solution strengthening to the yield strength of five-cycle ARB samples processed under pre-aged (ARBed) and aged (ARBed+Aged) conditions were examined and compared. Microstructural characterizations were performed on the samples through the transmission electron microscope (TEM) and X-ray diffraction (XRD). Also, the mechanical properties of the samples were investigated through the tensile test. The obtained results showed that an equiaxed ultrafine grain structure with nano-sized precipitates was created in the both ARBed and ARBed+Aged samples. The grain refinement was the predominant strengthening mechanism which was estimated to contribute 151 and 226 MPa to the ARBed and ARBed+Aged samples, respectively, while the dislocation and Orowan strengthening mechanisms were ranked second with regard to their contributions to the ARBed and ARBed+Aged samples, respectively. The overall yield strength, calculated through the root mean square summation method, was found to be in good agreement with the experimentally determined yield strength. It was also found that the presence of non-shearable precipitates, which interfered with the movement of the dislocations, would be effective for the simultaneous improvement of the strength and ductility of the ARBed+Agedsample .
Keywords
Accumulative roll bonding (ARB); Aging; Strengthening mechanisms; Microstructure; Mechanical properties
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