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

Dehghan, Mojtaba; Qods, Fathallah; Gerdooei, Mahdi

doi:10.4028/www.scientific.net/KEM.531-532.623

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

Abstract:

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.

Info:

Periodical:

Key Engineering Materials (Volumes 531-532)

Main Theme:

Materials Science and Nanotechnology I

Edited by:

Chunliang Zhang and Liangchi Zhang

Pages:

623-626

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.531-532.623

Citation:

M. Dehghan et al., "Effect of Accumulative Roll Bonding Process with Inter-Cycle Heat Treatment on Microstructure and Microhardness of AA1050 Alloy", Key Engineering Materials, Vols. 531-532, pp. 623-626, 2013

Online since:

December 2012

Authors:

Mojtaba Dehghan, Fathallah Qods, Mahdi Gerdooei

Keywords:

AA1050 Alloy, Accumulative Roll Bonding (ARB), Microhardness, Microstructure

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References

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Paper TitlePages

Nano-Structured High Purity Copper Processed by Accumulative Roll-Bonding

Authors: Seong Hee Lee, Seung Zeon Han, Cha Yong Lim

Abstract: Accumulative roll-bonding (ARB) process was applied to an oxygen free copper for improvement of the mechanical properties via ultra grain refinement to nanometer order level. Two copper sheets 1mm thick, 30mm wide and 300mm long are degreased and wire-brushed for sound bonding. The sheets are then stacked to each other, and cold-roll-bonded by 50% reduction rolling. The sheet is then cut to the two pieces of same length and the same procedure was repeated to the sheets. The ARB process up to eight cycles (an equivalent thickness strain of 6.4) is successfully performed at ambient temperature. TEM observation reveals that ultrafine grains, hardly containing the dislocation interior, begin to develop at the third cycle, and after the sixth cycle they cover most of regions of samples. The morphology of ultrafine grains formed is different from that of aluminum alloys. Tensile strength of the ARB-processed copper increases with the equivalent strain up to a strain of ~3.2, in which it reached 390 MPa, ~2.1 times higher than the initial value. However, the strength hardly changed at the strain above ~3.2.

239

Microstructure Changed during Accumulative Roll Bonding of Al/Mg Composite

Authors: M.C. Chen, Wei Te Wu

Abstract: In this study, the ARB process is used and the Al(1100)/Mg (AZ31) alloys which is chosen. Steps of 12 layers are created. The ARB process creates a multilayer compound between Al/Mg layers with excellent bonding characteristics and fine grained microstructure. The bonding condition became ascendant gradually with increased from 1 to 3 cycles. The grain sizes of Al and Mg alloys were reached to 875 nm and 656 nm after 3 cycles. The hardness of the Al and Mg alloys were raised to 42Hv and 90Hv after 3 cycles.

1445

Accumulative Roll-Bonding (ARB) of Sheets of Aluminium and its Commercial Alloys AA8006 and AA5754 at Ambient and Elevated Temperatures

Authors: Miroslav Karlík, Margarita Slámová, Petr Homola, P. Sláma, Miroslav Cieslar

Abstract: Mechanical properties and microstructure of twin-roll cast (TRC) pure aluminium, Al-Fe-Mn-Si (AA8006) and Al-Mg (AA5754) alloy sheets ARB processed at ambient and elevated temperatures (200, 250, 300 and 350°C) were investigated. Processing at elevated temperatures results in better bonding but it produces smaller increases in hardness. AA8006 specimens were processed without any problems up to 7 cycles. The alloy AA5754 suffered from severe edge and notch cracking since the first cycle. The strength was evaluated from tensile test and microhardness measurements; the microstructure was examined using light microscopy, and transmission electron microscopy. The microstructure was compared to that of conventionally cold rolled (CCR) specimens with true strain ε of 0.8, 1.6, 2.4 and 3.2 corresponding to the strain induced by 1 to 4 ARB cycles. The work hardening of alloy AA8006 saturated after the 3rd cycle, whereas the hardness of alloy AA5754 increased steadily up to the 5th cycle. Very fine grain structure with large fraction of high angle boundaries was observed in both alloys after two cycles of ARB. The grains were refined to submicrometre and nanometre size (down to 90 nm in alloy AA5754). Intensive post-dynamic recovery was observed in AA8006 specimens. The recovery is less pronounced in the AA5754 alloy with high concentration of solute atoms in solid solution.

767

Sliding Wear Behavior of Severely Deformed 6061 Aluminum Alloy by Accumulative Roll Bonding (ARB) Process

Authors: Mehdi Eizadjou, Armin Kazemi Talachi, Habib Danesh Manesh, Kamal Janghorban

Abstract: Sliding wear behavior of severely deformed 6061 aluminum alloy sheets by accumulative roll bonding (ARB) process subjected to dry sliding wear at different loading and sliding velocities was investigated using a pin on disc wear machine. The sheets were processed up to five ARB cycles in order to induce a high strain (~ 4.0) to the samples. EBSD results showed that after five cycles of ARB, sheets were found to contain ultra-fine grains with high fraction of high angle grain boundaries. Wear was continuously monitored by measuring the weight losses and morphologies of worn surfaces by scanning electron microscope (SEM), and a model for the wear of the ARB-processed samples was proposed.

1107

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

Authors: Mojtaba Dehghan, Fathallah Qods, Mahdi Gerdooei

Abstract: 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.

147