Microstructural evolution during accumulative roll-bonding of commercial purity aluminum

Huang, Xiaoxu; Tsuji, Nobuhiro; Hansen, Niels; Minamino, Yoritoshi

doi:10.1016/s0921-5093(02)00182-x

Cited by 271 publications

(146 citation statements)

References 11 publications

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“…Our observation of the overall finer boundary spacing in nickel after ARB as compared to conventional rolling is consistent with previous findings made for aluminum [27].…”

supporting

confidence: 93%

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Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

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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.

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“…Our observation of the overall finer boundary spacing in nickel after ARB as compared to conventional rolling is consistent with previous findings made for aluminum [27].…”

supporting

confidence: 93%

“…For example, in commercial purity aluminum the boundary spacing along the ND is 230240 nm after 6 to 8 cycles [12,27], i.e. two times greater than the values recorded for our Ni samples after the same number of cycles (see Fig.4).…”

contrasting

confidence: 57%

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

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“…In fact, the average grain size after ECAP is about 600 nm which is twice of the grain size after ARB. It should be noted that the grain size values of AA1050 in the current study are slightly higher than those reported for commercial purity Al [12,18,21], and the microstructure of the AA1050 appears to be more equiaxed compared to similar alloys reported in the literature [12,18,21]. This is believed to be due to the pre-heating before rolling, which accelerates the recovery process and prevents grain refinement.…”

Section: Comparison With Ecapcontrasting

confidence: 61%

“…Most of the grains are clearly defined with high angle boundaries after 5-cycle ARB, while some grains involved a high density of dislocations at the grain interiors. This is the typical microstructure of ARB processed commercial purity aluminium [12,21]. The grain sizes of the 1, 3 and 5-cycle ARB processed AA1050 sheets measured from TEM micrographs are approximately 465 nm, 406 nm and 300 nm, respectively.…”

Section: Methodsmentioning

confidence: 71%

“…Many aluminium based alloys have been processed by ARB in the literature. For commercial purity aluminium, for example, Huang et al carried out ARB of AA1100 at 473 K and they found that the microstructure after two cycles was composed of sub-micrometer lamellar structures [12]. Pirgazi et al succeeded to conduct ARB of AA1100 up to 10 cycles at the same deformation temperature [13].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Lü

et al. 2014

Materials Science and Engineering: A

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Accumulative roll bonding (ARB) is an effective method to produce ultrafine-grained (UFG) sheet materials with high strength. In this work, fully annealed AA1050 sheet with an initial thickness of 1.5. mm was processed by ARB up to five cycles. The microstructure was examined by optical microscopy (OM) and transmission electron microscopy (TEM). The results revealed that ARB is a promising process for fabricating ultrafine grained structures in aluminium sheets and the average grain size after 5-cycle ARB reached approximately 300. nm. Meanwhile, a remarkable enhancement in the strength was achieved and the value was about three times the strength of starting material. The microstructure at the bond interface introduced during ARB was investigated and its influence was discussed in detail. In addition, the microstructure and mechanical properties after ARB were compared with that after deformation by equal channel angular pressing (ECAP) up to the same strain. It has been found that ARB is more efficient in grain refinement and strengthening, which can be attributed to the different deformation modes of the two techniques. Accumulative roll bonding (ARB) is an effective method to produce ultrafine-grained (UFG) sheet materials with high strength. In this work, fully annealed AA1050 sheet with an initial thickness of 1.5 mm was processed by ARB up to five cycles. The microstructure was examined by optical microscopy (OM) and transmission electron microscopy (TEM). The results revealed that ARB is a promising process for fabricating ultrafine grained structures in aluminium sheets and the average grain size after 5-cycle ARB reached approximately 300 nm. Meanwhile, a remarkable enhancement in the strength was achieved and the value was about three times the strength of starting material. The microstructure at the bond interface introduced during ARB was investigated and its influence was discussed in detail. In addition, the microstructure and mechanical properties after ARB were compared with that after deformation by equal channel angular pressing (ECAP) up to the same strain. It has been found that ARB is more efficient in grain refinement and strengthening, which can be attributed to the different deformation modes of the two techniques.

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ARB (Accumulative Roll‐Bonding) and Other New Techniques to Produce Bulk Ultrafine Grained Materials

Tsuji

Saito

Lee

et al. 2004

Nanomaterials by Severe Plastic Deformation

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Microstructural evolution during accumulative roll-bonding of commercial purity aluminum

Cited by 271 publications

References 11 publications

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

ARB (Accumulative Roll‐Bonding) and Other New Techniques to Produce Bulk Ultrafine Grained Materials

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