A new insight into ductile fracture of ultrafine-grained Al-Mg alloys

Yu, Hailiang; Tieu, Anh Kiet; Lü, Cheng; Liu, Xiong; Liu, Mao; Godbole, Ajit R; Kong, Charlie; Qin, Qing Hua

doi:10.1038/srep09568

Cited by 35 publications

(27 citation statements)

References 56 publications

(61 reference statements)

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“…[11][12][13] Variants of the SPD techniques such as asymmetric cryorolling, [14,15] Accumulative Roll Bonding (ARB) [16,17] and Asymmetric Rolling (AR) [18,19] have been developed to enable bulk fabrication of nanostructured/ultrafine-grained metal sheets/foils. The ARB and AR techniques can be used to produce continuous products and are more feasible for practical application in industries.…”

Section: Introductionmentioning

confidence: 99%

High Strength and Ductility of Ultrathin Laminate Foils Using Accumulative Roll Bonding and Asymmetric Rolling

Tieu

Hadi

et al. 2014

Metall Mater Trans A

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As product miniaturization is becoming widely popular, many microparts are being produced by microforming of sheets/foils, whose strength needs to be able to maintain structural stability of the microcomponents. In addition, their strength and ductility of foils generally reduce with a reduction in the thickness due to the size effect. In this paper, we report the fabrication of an aluminum laminate foil using a combined process of accumulative roll bonding (ARB) and asymmetric rolling (AR). It was found that this improves both strength and ductility. TEM results show that the laminate structures produced by ARB develop an inhomogeneous microstructure with nanoscale grains and abnormal coarsening in some grains during AR processing. Both these effects result in an improved ductility and strength. Using these rolled products, micro-cups of very small wall thickness/cup diameter ratio (1/200) have been successfully fabricated by micro-deep drawing without the need for annealing. KeywordsAluminum alloy; Nanostructure; Abnormal grain growth; Rolling; Deep drawing; Ultrathin laminate foil Disciplines Engineering | Science and Technology Studies Publication DetailsYu, H., Tieu, A. Kiet., Hadi, S., Lu, C., Godbole, A. & Kong, C. (2015). High strength and ductility of ultrathin laminate foils using accumulative roll bonding and asymmetric rolling. Metallurgical Abstract: As product miniaturization is becoming widely popular, many microparts are being produced by microforming of sheets/foils, whose strength needs to be able to maintain structural stability of the micro components. In addition, their strength and ductility of foils generally reduces with a reduction in the thickness due to the size effect. In this paper, we report the fabrication of an aluminum laminate foil using a combined process of Accumulative Roll Bonding (ARB) and Asymmetric Rolling (AR). It was found that this improves both strength and ductility. TEM results show that the laminate structures produced by ARB develop an inhomogeneous microstructure with nanoscale grains and abnormal coarsening in some grains during AR processing. Both these effects result in an improved ductility and strength. Using these rolled products, micro-cups of very small wall thickness/cup diameter ratio (1/200) have been successfully fabricated by micro deep drawing without the need for annealing.

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Section: Introductionmentioning

confidence: 99%

High Strength and Ductility of Ultrathin Laminate Foils Using Accumulative Roll Bonding and Asymmetric Rolling

Tieu

Hadi

et al. 2014

Metall Mater Trans A

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“…This matches well with the value reported by Wen et al, [32] who found that coarse copper powders attained an ultimate stable grain size of ~100 nm during HPT at room temperature. For UFG AA5052 sheets, Yu et al [22] investigated the grain distribution at the fracture surface and proposed a relationship between ductile fracture and grain refinement during deformation besides the void nuclear and growth. As the grains are refined to a nano size approaching the theoretical minimum achievable value, the material becomes brittle in the shear band zone.…”

Section: Mompiou Et Almentioning

confidence: 99%

Simultaneous Grain Growth and Grain Refinement in Bulk Ultrafine-Grained Copper under Tensile Deformation at Room Temperature

Lü

et al. 2016

Metall Mater Trans A

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Grain growth and grain refinement behavior during deformation determine the strength and ductility of ultrafine-grained materials. We used asymmetric cryorolling to fabricate ultrafine-grained copper sheets with an average grain width of 230 nm and having a laminate structure. The sheets show a high-true failure strain of 1.5. Observation of the microstructure at the fracture surface reveals that ultrafine laminate-structured grains were simultaneously transformed into both equiaxed nanograins and coarse grains under tensile deformation at room temperature. Abstract: Grain growth and grain refinement behavior during deformation determines the strength and ductility of ultrafine-grained materials. We used

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“…Recently, Yu et al [81][82][83][84] combined the features of AR and CR to fabricate UFG/NG metals. A schematic illustration of ACR is shown in Fig.…”

Section: Asymmetric Cryorolling (Acr)mentioning

confidence: 99%

“…The ACR technique has been used successfully to produce UFG Al 1050, [81] 6061 [82][83] and 5052 [84] alloys. Following ACR, the grain size in Al 1050 sheet with the roll speed ratio (RRS) 1.4 is seen to be much finer than that with the RRS 1.1.…”

Section: Asymmetric Cryorolling (Acr)mentioning

confidence: 99%

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

Lü

Tieu

et al. 2015

Adv Eng Mater

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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.

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A new insight into ductile fracture of ultrafine-grained Al-Mg alloys

Cited by 35 publications

References 56 publications

High Strength and Ductility of Ultrathin Laminate Foils Using Accumulative Roll Bonding and Asymmetric Rolling

High Strength and Ductility of Ultrathin Laminate Foils Using Accumulative Roll Bonding and Asymmetric Rolling

Simultaneous Grain Growth and Grain Refinement in Bulk Ultrafine-Grained Copper under Tensile Deformation at Room Temperature

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

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