Production of nano-grained structure in 6061 aluminum alloy strip by accumulative roll bonding

Rezaei, Mohammad Reza; Toroghinejad, Mohammad Reza; Ashrafizadeh, F.

doi:10.1016/j.msea.2011.09.057

Cited by 40 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the Ni samples studied in the present experiment, both the total elongation (see Fig.6) and uniform elongation (Fig.7) are very low over a wide range of ARB cycles, which is similar to the findings for the 1XXX and 6XXX series Al-alloys described in [5][6][7][8]. Similar to the approaches taken for improving low ductility in the ARB-processed Al-alloy, it may be possible to restore some ductility in ARB-Ni while still maintaining a high level of strength by use of controlled annealing treatments.…”

Section: Analysis Of Mechanical Behaviorsupporting

confidence: 88%

“…For example, in some Al-alloys the tensile elongation remains quite low regardless of the number of ARB cycles, being either almost insensitive to the accumulated strain or showing a clear tendency to decrease as the number of cycles increases [5][6][7][8]. However, in other ARB-processed Al samples the ductility represented in terms of the total elongation to failure increases substantially with increasing number of cycles [6,9].…”

Section: Analysis Of Mechanical Behaviormentioning

confidence: 99%

“…Although there have been a large number of studies of ARB-processed aluminum, copper, steels and titanium [4][5][6][7][8][9][10][11][12][13][14][15], there are very few publications describing the evolution of the microstructure during ARB of nickel. For example, the microstructure and texture of ARB-processed Ni were characterized after 8 cycles [16,17].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB). Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels. Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ0 = k2dav-0.5, where k2 is a constant and dav is the average boundary spacing in the deformed microstructure. Abstract: A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB).Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels.Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on *Manuscript Click here to view linked References 2 the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ 0 = k 2 d av -0.5 , where k 2 is a constant and d av is the average boundary spacing in the deformed microstructure.

show abstract

Section: Analysis Of Mechanical Behaviorsupporting

confidence: 88%

Section: Analysis Of Mechanical Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

show abstract

“…6 shows the grain size of Al 6061 alloy resulting from a number of SPD processes. After five cycles of the ARB technique (equivalent strain 4), the mean size of the grains was seen to be about 230-240 nm [2,3]. When using the DCAP technique, the majority of subgrains or dislocation cells were observed in the interiors with the range size of 50-300 nm after five passes (equivalent strain 3.0) [4].…”

Section: Experiments and Fe Simulationmentioning

confidence: 99%

“…This is due to improved physical and mechanical properties inherent to nano-structure materials. SPD techniques such as Accumulative Roll Bonding (ARB) [1][2][3], Dissimilar Channel Angular Pressing (DCAP) [4], High-Pressure Torsion (HPT) [5][6][7], Equal Channel Angular Pressing (ECAP)/Equal Channel Angular Extrusion (ECAE) [8][9][10][11], etc have been developed to fabricate bulk nano-structure or ultrafine grain samples from different metals. Among the currently available SPD techniques, only the ARB technique is appropriate for production of continuous nanocrystalline and ultrafine grain strips and plates.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 degrees celcius. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-Cr-Mn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm. An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 1C. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-CrMn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm.

show abstract

Microstructure and Texture Development in Al–3%Brass Composite Produced through ARB

et al. 2017

Self Cite

View full text Add to dashboard Cite

In the present work, aluminum-3% brass composite sheets are produced by accumulative roll bonding (ARB) process up to nine passes at ambient temperature. Evolution of rolling texture is studied by texture measurement using X-ray diffraction method. The results show that ARB process leads to the formation of copper ({112} <111>) and Dillamore ({4 4 11} <11 11 8>) as the major texture components. The intensity of copper and Dillamore components enhances to values as high as 19 times that of random with increasing number of passes to 9. It is observed that the 5th pass is a transition in development of the texture components, after which the intensities undergo a drop. The textures are comparable to ARB process of high purity aluminum, indicating that the addition of 3% brass particles do not cause any significant change in the deformation behavior. Electron backscatter diffraction (EBSD) technique is used to examine the microstructure; the results reveal formation of ultrafine grains (UFG), starting in the 3rd pass and covers the entire structure after the 5th pass. The major mechanisms involved are identified as rotation of the sub-grains, as well as grain boundary migration.

show abstract

Production of nano-grained structure in 6061 aluminum alloy strip by accumulative roll bonding

Cited by 40 publications

References 28 publications

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Microstructure and Texture Development in Al–3%Brass Composite Produced through ARB

Contact Info

Product

Resources

About