Ultrafine grained AA1050/AA6061 composite produced by accumulative roll bonding

Su, Lihong; Lü, Cheng; Tieu, Anh Kiet; Deng, Guanyu; Sun, Xudong

doi:10.1016/j.msea.2012.08.109

Cited by 70 publications

(41 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 that there are basically two types of interfacial microstructures: the ones with more refined microstructure at the interfaces and the ones without. The more refined microstructure is caused by the oxides and contamination at the surfaces where the interfaces had been introduced in the previous ARB cycles [11,15,26]. The similar interfacial microstructure was been observed in the authors' previous work and was concluded as two types: type I with direct contact of fresh metals and type II with oxide film layers in between of original metal surface [26].…”

Section: Bond Interfacesupporting

confidence: 74%

“…These two types of interfaces also apply in the current experiment, with However, there are some differences in the interfacial microstructure observed in the current study and that observed in Ref. [26]. The contrast of the interfacial area is similar to that of the bulk metal for all the cases in Ref.…”

Section: Bond Interfacesupporting

confidence: 69%

“…The contrast of the interfacial area is similar to that of the bulk metal for all the cases in Ref. [26], which indicates that the interface is as strong as the bulk metal during twin-jet polishing. By contrast, in the current study, the interfacial area for the type I interface shows as a bright line (Fig.…”

Section: Bond Interfacesupporting

confidence: 53%

“…The more refined microstructure is caused by the oxides and contamination at the surfaces where the interfaces had been introduced in the previous ARB cycles [11,15,26]. The similar interfacial microstructure was been observed in the authors' previous work and was concluded as two types: type I with direct contact of fresh metals and type II with oxide film layers in between of original metal surface [26]. These two types of interfaces also apply in the current experiment, with However, there are some differences in the interfacial microstructure observed in the current study and that observed in Ref.…”

Section: Bond Interfacementioning

confidence: 99%

See 3 more Smart Citations

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Lü

et al. 2014

Materials Science and Engineering: A

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Bond Interfacesupporting

confidence: 74%

Section: Bond Interfacesupporting

confidence: 69%

Section: Bond Interfacesupporting

confidence: 53%

Section: Bond Interfacementioning

confidence: 99%

See 2 more Smart Citations

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Lü

et al. 2014

Materials Science and Engineering: A

Self Cite

View full text Add to dashboard Cite

show abstract

“…The details of the ARB process and the microstructure and mechanical properties of the ARB processed laminates can refer to Ref. [7]. Neutron diffraction residual stress measurements have been carried out at the ANSTO OPAL research reactor using the KOWARI strain scanner.…”

Section: Methodsmentioning

confidence: 99%

Residual Stress Study of Al/Al Laminates Processed by Accumulative Roll Bonding

et al. 2016

Residual Stresses 2016

View full text Add to dashboard Cite

Abstract. In this work accumulative roll bonding (ARB) was used to combine AA1050 and AA6061 sheets to produce AA1050/AA1050, AA6061/AA6061 and AA1050/AA6061 laminates with ultrafine grained (UFG) structure. Two sheets of starting materials were roll bonded with 200 °C preheating for 180 s before rolling. The through-thickness residual stress distribution of these laminates processed up to two cycles of ARB was determined by neutron diffraction with spatial resolution of 0.2 mm through 1.5 mm thickness. The measurements also required high accuracy of only few MPa since residual stresses in the laminates peaked at only about 15 MPa. The laminates composed of the same material (AA1050/AA1050 and AA6061/AA6061) showed symmetric residual stress profile with tensile stress at the centre of the sheets and compressive stress at the surfaces. The AA1050/AA6061 laminates showed asymmetric distribution with residual tensile stress in the AA1050 layer and compressive stress in the AA6061 layer. A finite element model (FEM) was used to simulate the residual stress distribution and the results were in agreement with the measured results qualitatively. IntroductionAluminium sheets are widely used as structural components in aircraft and automotive which has strict requirements of strength/weight ratio. Accumulative roll bonding (ARB) is an effective process to produce aluminium sheets with high strengths and it is also possible to bond two types of aluminium sheets in the hope that the properties of the original sheets would combine in the bonded laminates [1][2][3]. The materials processed by ARB generally experience larger strain magnitudes compared to traditional rolling. Furthermore, the ARB process includes rolling, cutting, surface grinding and stacking in different order, which makes the strain history complex in the bonded laminates. Microstructure, texture and mechanical properties distributions through the thickness of the laminates are non-uniform. This is especially true if different starting materials are used.In addition, layers of different materials or materials at different thickness positions perform differently upon further deformation developing residual stress which is strongly dependent on the thermomechanical processing history of the materials. Residual stresses of traditional rolled sheets have been well reported [4][5][6]. Typical residual stress distribution of a rolled sheet material is tensile at the sheet centre and compressive at the sheet surfaces [6]. Residual stress of ARB processed sheets has not been evaluated up to now and it can be inferred that the residual stress distribution of the ARB processed sheets should be more complex than that of conventional rolling since the strain history of the ARB processed sheets is complex due to the cutting and stacking procedure.

show abstract

Special Rolling Techniques for Improvement of Mechanical Properties of Ultrafine‐Grained Metal Sheets: a Review

Lü

Tieu

et al. 2015

Adv Eng Mater

Self Cite

View full text Add to dashboard Cite

Interest in ultrafine-grained (UFG) materials has grown rapidly in past 20 years. This review focuses on the application of special rolling techniques for improvement of the mechanical properties of UFG metal sheets. These techniques include asymmetric rolling, cryorolling, asymmetric cryorolling, cross-accumulative roll bonding, and skin-pass rolling. The techniques also include a combination of processes such as equal channel angular press and subsequent rolling, combined high-pressure torsion and subsequent rolling, as well as combined accumulative roll bonding and subsequent asymmetric rolling. We also discuss the main mechanisms leading to improvement in the ductility of UFG materials related to the special rolling techniques. properties of ultrafine-grained (UFG) metal sheets. These techniques include asymmetric rolling, cryorolling, asymmetric cryorolling, cross-accumulative roll bonding and skin-pass rolling. The techniques also include a combination of processes such as equal channel angular press and subsequent rolling, combined high pressure torsion and subsequent rolling, as well as combined accumulative roll bonding and subsequent asymmetric rolling. We also discuss the main mechanisms leading to improvement in the ductility of UFG materials related to the special rolling techniques.

show abstract

Ultrafine grained AA1050/AA6061 composite produced by accumulative roll bonding

Cited by 70 publications

References 22 publications

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Residual Stress Study of Al/Al Laminates Processed by Accumulative Roll Bonding

Special Rolling Techniques for Improvement of Mechanical Properties of Ultrafine‐Grained Metal Sheets: a Review

Contact Info

Product

Resources

About