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High-temperature deformation and structural restoration of a nanostructured Al alloy [electronic resource]
, Article Journal of Scripta Materialia (Pergamon) ; June 2012, Volume 66, Issue 11, Pages 911–914 ; Simchi, A. (Abdolreza) ; Kim, H. S ; Sharif University of Technology
Abstract
We studied the flow stress and microstructural changes of nanostructured Al-6063 alloy produced by mechanical alloying at various temperatures and strain rates. The analysis of flow curves was performed by a constitutive equation, and the stress exponent and activation energy were determined as functions of strain. The deformation mechanisms were elaborated through microstructural observations by electron backscattering diffraction and transmission electron microscopy. Coarsening of the subgrains and grain growth upon deformation was monitored and related to the Zener–Hollomon parameter
High-temperature deformation and structural restoration of a nanostructured Al alloy
, Article Scripta Materialia ; Volume 66, Issue 11 , 2012 , Pages 911-914 ; 13596462 (ISSN) ; Simchi, A ; Kim, H. S ; Sharif University of Technology
2012
Abstract
We studied the flow stress and microstructural changes of nanostructured Al-6063 alloy produced by mechanical alloying at various temperatures and strain rates. The analysis of flow curves was performed by a constitutive equation, and the stress exponent and activation energy were determined as functions of strain. The deformation mechanisms were elaborated through microstructural observations by electron backscattering diffraction and transmission electron microscopy. Coarsening of the subgrains and grain growth upon deformation was monitored and related to the Zener-Hollomon parameter
Constitutive analysis and microstructural evolution in hot working of nanostructured Al6063
, Article Proceedings of the International Euro Powder Metallurgy Congress and Exhibition, Euro PM 2012, 16 September 2012 through 19 September 2012, Basel ; Volume 1 , September , 2012 ; 9781899072361 (ISBN) ; Simchi, A ; Sharif University of Technology
European Powder Metallurgy Association (EPMA)
2012
Abstract
Flow curves and microstructural changes of nanostructured Al6063 alloy produced by mechanical alloying followed by hot extrusion were investigated by means of uniaxial compression test in the temperature range between 300 and 450 °C and strain rate range between 10-2 and 1 s-1. The analysis of flow curves were performed by a hyperbolic sine law equation and the stress exponent and activation energy were determined to be 2.9 and 228 kJ mol-1, respectively. The microstructural constituents for elaboration of deformation mechanisms were observed by TEM and EBSD under FEG-SEM. The microstructural observations determine that dynamic recovery through the formation of subgrains within the grains...
Dynamic restoration and microstructural evolution during hot deformation of a P/M Al6063 alloy
, Article Materials Science and Engineering A ; Volume 542 , April , 2012 , Pages 56-63 ; 09215093 (ISSN) ; Simchi, A ; Kim, H. S ; Sharif University of Technology
2012
Abstract
Hot deformation behavior of Al6063 alloy produced by direct powder extrusion was studied by means of uniaxial compression test in the temperature range between 300 and 450°C and strain rate range between 0.01 and 1s -1. Electron backscatter diffraction (EBSD) technique and transmission electron microscopy (TEM) were utilized to study the microstructure of the material before and after the hot deformation. The microstructure of the extruded alloy consisted of elongated grains within a subgrain structure and small grains free of low angle grain boundaries (LAGBs). An equiaxed duplex microstructure consisting of large substructured grains and fine grains separated by high angle grain boundaries...