Investigation of Microstructure of the Commercial Pure Aluminium in the ARB Process

2011 ◽  
Vol 702-703 ◽  
pp. 147-150 ◽  
Author(s):  
Mojtaba Dehghan ◽  
Fathallah Qods ◽  
Mahdi Gerdooei
Keyword(s):  
Microstructural Evolution ◽  
Hardness Measurement ◽  
Polycrystalline Materials ◽  
Pure Aluminium ◽  
Metallic Materials ◽  
Micro Hardness ◽  
Roll Bonding ◽  
Purity Aluminium ◽  
Commercial Purity Aluminium ◽  
Vickers Hardness Measurement

The severe plastic deformation (SPD) of metallic materials has become attractive in recent years. Accumulative roll bonding (ARB) is a SPD process that can impose deformation to a sheet metal, as it develops fine grains of typically submicrometer or even the nanometer level in polycrystalline materials. The purpose of the present study is investigation of microstructural evolution and micro hardness behavior of the commercial purity Aluminium (AA1050) severely deformed by the ARB process. The microstructural evolution during 13 cycles of ARB process was investigated. With increasing ARB cycles the grains size reduced in nanometer range. Furthermore, Micro-Vickers hardness measurement was carried out throughout thickness of the ARB processed sheets.

Effect of Accumulative Roll Bonding Process with Inter-Cycle Heat Treatment on Microstructure and Microhardness of AA1050 Alloy

2012 ◽  
Vol 531-532 ◽  
pp. 623-626 ◽  
Author(s):  
Mojtaba Dehghan ◽  
Fathallah Qods ◽  
Mahdi Gerdooei
Keyword(s):  
Accumulative Roll Bonding ◽  
Metal Forming ◽  
High Strength ◽  
Hardness Measurement ◽  
Rolling Process ◽  
Large Plastic Strain ◽  
Roll Bonding ◽  
Fine Grained ◽  
Purity Aluminium ◽  
Commercial Purity Aluminium

Processes with severe plastic deformation (SPD) may be defined as metal forming processes in which ultra-large plastic strain is introduced into a bulk metal in order to create ultra-fine grained (UFG) metals. Accumulative roll bonding (ARB) is a SPD process that may be defined as multisteps rolling process in order to create high strength metals with UFG structure. In this study, ARB process with inter-cycle annealing is carried out on the commercial purity aluminium (AA1050) sheet up to 13 cycles. The purpose of the present study is investigation of microhardness behavior and microstructural evolution in the ARB processed AA1050 sheet. Micro-Vickers hardness measurement is carried out throughout thickness of the ARB processed sheets. In addition, with increasing ARB cycles the grains size is reduced in nanometer level.

Texture Evolution in ARB Processed Commercial Purity Aluminium

2011 ◽  
Vol 702-703 ◽  
pp. 173-176 ◽  
Author(s):  
Yoji Miyajima ◽  
Daisuke Kashioka ◽  
Nobuhiro Tsuji
Keyword(s):  
Texture Evolution ◽  
Rolling Texture ◽  
Pure Aluminium ◽  
Commercial Purity ◽  
Purity Aluminium ◽  
Metal Sheets ◽  
Copper Component ◽  
Commercial Purity Aluminium ◽  
Aluminium Sheets ◽  
Fcc Metal

Texture of the ARB processed commercial purity aluminium was investigated in order to explore the stable component in rolling texture more than 95 % of rolling reduction in FCC metal sheets having high stacking fault energy. Weak location dependence along normal direction was observed in the sheet up to ARB 8 cycle, whereas the texture could be regarded to be uniform after ARB 8 cycle. The main orientation was Copper component, whereas the minor orientations were Brass and S orientations in the ARB processed pure aluminium sheets rolled up to around 99.9 % reduction.

Nanostructured Aluminium - Recovery and Recrystallization

2007 ◽  
Vol 558-559 ◽  
pp. 201-206 ◽  
Author(s):  
Niels Hansen ◽  
X. Huang ◽  
Andrew Godfrey
Keyword(s):  
High Strain ◽  
Annealing Process ◽  
Commercial Purity ◽  
Hardness Testing ◽  
Microstructural Investigation ◽  
Annealing Behavior ◽  
Roll Bonding ◽  
Purity Aluminium ◽  
Commercial Purity Aluminium

The isochronal annealing behavior of nanostructured commercial purity aluminium (AA1100 and AA1200) following either cold – rolling or accumulative roll bonding up to an ultra high strain of εvM = 6.2 (99.5% reduction in thickness) has been studied via hardness testing and by a microstructural investigation. A large effect of rolling strain is observed on the recovery at temperatures below approx. 200 °C. At higher temperatures an assessment of the changes in hardness and microstructure leads to a characterization of the annealing process as one of conventional (discontinuous) recrystallization.

Observation of secondary slip systems in tungsten bicrystals

1984 ◽  
Vol 42 ◽  
pp. 478-479
Author(s):  
J. R. Fekete ◽  
R. Gibala
Keyword(s):  
Stress Field ◽  
Grain Boundaries ◽  
Deformation Behavior ◽  
Stress Axis ◽  
Polycrystalline Materials ◽  
Slip Systems ◽  
Metallic Materials ◽  
Twist Boundary ◽  
Secondary Slip ◽  
Plane Normal

The deformation behavior of metallic materials is modified by the presence of grain boundaries. When polycrystalline materials are deformed, additional stresses over and above those externally imposed on the material are induced. These stresses result from the constraint of the grain boundaries on the deformation of incompatible grains. This incompatibility can be elastic or plastic in nature. One of the mechanisms by which these stresses can be relieved is the activation of secondary slip systems. Secondary slip systems have been shown to relieve elastic and plastic compatibility stresses. The deformation of tungsten bicrystals is interesting, due to the elastic isotropy of the material, which implies that the entire compatibility stress field will exist due to plastic incompatibility. The work described here shows TEM observations of the activation of secondary slip in tungsten bicrystals with a [110] twist boundary oriented with the plane normal parallel to the stress axis.

Evolutions of Microstructure for Multilayered Al-Mg Alloy Composites by Accumulation Roll Bonding (ARB) Process

2011 ◽  
Vol 411 ◽  
pp. 527-531
Author(s):  
Bing Zhang ◽  
Zhong Wei Chen ◽  
Shou Qian Yuan ◽  
Tian Li Zhao
Keyword(s):  
Multilayer Structure ◽  
Optical Microscope ◽  
Alloy Layer ◽  
Mg Alloy ◽  
Micro Hardness ◽  
Roll Bonding ◽  
Fine Grained ◽  
Hardness Tester ◽  
Average Grain Size ◽  
Evolution Of Microstructure

In this paper, accumulative roll bonding (ARB) has been used to prepare the Al/Mg alloy multilayer structure composite materials with 1060Al sheet and MB2 sheet. The evolution of microstructure of the cladding materials during ARB processes was observed by optical microscope, scanning electron microscopy, and micro-hardness was measured by micro-hardness tester. The results show that a multilayer structure material of Al/Mg alloy with excellent bonding characteristics and fine grained microstructure was prepared by ARB processes. With the ARB cycles increasing, Mg alloy layer in multilayer composite material was necked and fractured, and the hardness of the Al and Mg alloy was increased. Average grain size was less than 1μm after ARB4 cycles.

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