Macro‐ and Nanomechanical Properties and Strain Rate Sensitivity of Accumulative Roll Bonded and Equal Channel Angular Pressed Ultrafine‐Grained Materials

Böhner, Andreas; Maier, Verena; Durst, Karsten; Höppel, Heinz Werner; Göken, Mathias

doi:10.1002/adem.201000270

Cited by 39 publications

(49 citation statements)

References 26 publications

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“…The efficiency of ARB deformation would be more obvious if the ARB process was conducted at room temperature. Cherukuri et al [33] and Böhner et al [20] conducted ARB and ECAP deformation on aluminium alloys up to the same accumulative strain and found that ARB processed samples had higher strength, which is consistent with the results of the present work. The difference between the ARB and ECAP processed AA1050 can be explained by the different deformation modes.…”

Section: Comparison With Ecapsupporting

confidence: 91%

“…A systematic study on the properties of the ARB processed commercial pure aluminium is still essential, and some aspects of the properties like the interfacial microstructure and its formation mechanism and effects have never been studied in detail. Böhner et al [20] studied the difference of commercial purity aluminium after ECAP and ARB to the same strain by the tensile test and nanoindentation and found that the material after ARB was stronger at the tensile test but weaker at the nanoindentation test. The difference in microstructure was not studied.…”

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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Section: Comparison With Ecapsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Lü

et al. 2014

Materials Science and Engineering: A

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“…12). The estimated nanoindentation m-value for bulk ARB Al is in good accordance to values in literature from Schweitzer et al 40 and Böhner et al, 25 who found an m-value around 0.07 in UFG samples.…”

supporting

confidence: 90%

“…Further details on the ARB process and the materials properties can be found in Höppel et al 8 and Böhner et al 25 NC-Ni and UFG-Al cross sections were prepared for metallographic and nanoindentation examinations. The specimens were mounted in Technovit 4071 (Technovit, Heraeus-Kulzer, Germany) and acrylic resin Technovit 2000 LC, respectively, ground, polished with diamond down to 1 lm, and electrolytically polished.…”

Section: Experimental a Materials And Sample Preparationmentioning

confidence: 99%

Nanoindentation strain-rate jump tests for determining the local strain-rate sensitivity in nanocrystalline Ni and ultrafine-grained Al

et al. 2011

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A nanoindentation strain-rate jump technique has been developed for determining the local strainrate sensitivity (SRS) of nanocrystalline and ultrafine-grained (UFG) materials. The results of the new method are compared to conventional constant strain-rate nanoindentation experiments, macroscopic compression tests, and finite element modeling (FEM) simulations. The FEM simulations showed that nanoindentation tests should yield a similar SRS as uniaxial testing and generally a good agreement is found between nanoindentation strain-rate jump experiments and compression tests. However, a higher SRS is found in constant indentation strain-rate tests, which could be caused by the long indentation times required for tests at low indentation strain rates. The nanoindentation strain-rate jump technique thus offers the possibility to use single indentations for determining the SRS at low strain rates with strongly reduced testing times. For UFG-Al, extremely fine-grained regions around a bond layer exhibit a substantial higher SRS than bulk material.

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“…It should be noted that the improved m value of 0.1 for the MMNC in the Al-Mg system after HPT and PDA is even higher than earlier reports where m values were estimated through nanoindentation testing of ~0.07 for a commercial purity Al after ECAP for 6-12 passes at RT [39][40][41][42] and after ARB for 8 cycles at RT [40] and ~0.035-0.050 for a ZK60 alloy after HPT for 2 turns at RT [43]. Thus, the MMNC after HPT followed by PDA demonstrates a significantly higher value of m compared with the initial materials when they are processed separately.…”

Section: The Improvement In Micro-mechanical Response By Pdamentioning

confidence: 58%

Micro-mechanical and tribological properties of aluminum-magnesium nanocomposites processed by high-pressure torsion

Han

Lee

Jang

et al. 2017

Materials Science and Engineering: A

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High-pressure torsion (HPT) is one of the major severe plastic deformation (SPD) procedures where bulk metals, in the shape of a disk, achieve exceptional grain refinement at ambient temperatures. HPT has been applied for the consolidation of metallic powders and the bonding of machining chips whereas there are very limited reports examining the application of HPT for the production of new metal systems and the formation of nanocomposites. Accordingly, this investigation was initiated to evaluate the potential for the formation of a metal matrix nanocomposite (MMNC) by processing two commercial metal disks of an Al-1050 alloy and a ZK60 magnesium alloy through HPT under 6.0 GPa for 20 turns at room temperature. Evolutions in microstructure, mechanical properties including hardness and plasticity and the tribological properties were examined in the MMNC region of the processed Al-Mg system. The significance of post-deformation annealing (PDA) at 573 K for 1 hour was investigated by the change in microstructure and the enhancement in mechanical properties and wear resistance of the HPT-processed MMNC. This study demonstrates the promising feasibility of using HPT to fabricate a wide range of hybrid MMNCs from simple metals and for applying PDA for further improvement of the essential mechanical and tribological properties in the synthesized alloy systems.

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Macro‐ and Nanomechanical Properties and Strain Rate Sensitivity of Accumulative Roll Bonded and Equal Channel Angular Pressed Ultrafine‐Grained Materials

Cited by 39 publications

References 26 publications

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding

Nanoindentation strain-rate jump tests for determining the local strain-rate sensitivity in nanocrystalline Ni and ultrafine-grained Al

Micro-mechanical and tribological properties of aluminum-magnesium nanocomposites processed by high-pressure torsion

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