Global and local strain rate sensitivity of bimodal Al-laminates produced by accumulative roll bonding

Ruppert, Mathis; Schunk, Christopher; Hausmann, Daniel; Höppel, Heinz Werner

doi:10.1016/j.actamat.2015.11.009

Cited by 37 publications

(17 citation statements)

References 35 publications

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“…4b summarizes the variation of ultimate strength and ductility, which confirms their reproducibility. It's worth noting that some earlier ARB studies also reported similar simultaneous improvements in strength and ductility with increasing rolling cycles, but most of these studies attributed this phenomenon to microstructure change instead of the interface spacing [29,43,44]. Fig.…”

Section: Heterogeneity Across Interfacesmentioning

confidence: 85%

“…Second, even for laminate structures with stationary interfaces, it is not trivial to fabricate samples with varying interface spacing and also with similar microstructure across the interface in terms of the grain size and texture. For example, the majority of laminate metallic structures fabricated by accumulative roll bonding (ARB) always have finer microstructures with increasing rolling cycles [28,29]. Furthermore, even atomic structure of interface might change with decreasing interface spacing [4,30].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of copper/bronze laminates: Role of interfaces

et al. 2016

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a b s t r a c tInterfaces play a crucial role in mechanical behaviors of both laminated and gradient structured materials. In this work, copper/bronze laminates with varying interface spacing were fabricated by accumulative roll bonding and subsequent annealing to systematically study the interface effect on mechanical properties. Heterogeneities exist in chemical composition, grain size, hardness and texture across the interfaces. Simultaneous improvement of strength and ductility with decreasing interface spacing is found in tensile tests. Extra geometrically necessary dislocations (GNDs) are found to accumulate in the vicinity of interfaces, which is due to mechanical incompatibility across the interfaces. Importantly, an interface-affected zone spanning a few micrometers was found, which is not affected by interface spacing. These observations suggest the existence of an optimum spacing, which may produce the highest hardening capacity and ductility without sacrificing strength.

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Section: Heterogeneity Across Interfacesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Mechanical properties of copper/bronze laminates: Role of interfaces

et al. 2016

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“…[23] Only after four cycles, the grain size decreases in the HP layers, as the grains growth is limited in the normal direction by the decreasing layer thickness. [22] Ruppert et al [24] used the same material system but produced laminates with five times thicker layers than the material investigated by Chekhonin et al [22] It turned out that for the thicker laminates, the grain size in the HP layers only decreases after six ARB cycles. Using those thicker laminates, Ruppert et al succeeded in determining the mechanical properties by macroscopic strain-rate compression jump tests and by local strain-rate jump tests using nanoindentation.…”

Section: Introductionmentioning

confidence: 99%

The Role of Interfaces on the Deformation Mechanisms in Bimodal Al Laminates Produced by Accumulative Roll Bonding

et al. 2020

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Laminated metallic materials with an ultrafine‐grained (UFG) microstructure can easily be produced by accumulative roll bonding (ARB). Combining two different Al alloys, commercially pure (CP) and high‐purity (HP) aluminum, a layerwise bimodal microstructure is formed, where the CP layers consist of ultrafine grains whereas the HP layers show large grains as these layers undergo dynamic recrystallization during rolling. By applying different numbers of ARB passes and in addition by applying a subsequent heat treatment, the microstructure of the laminate can be changed significantly. Thus, different types of interfaces, specifically the grain boundaries of the ultrafine grains and the interfaces between the different layers of CP and HP aluminum are dominating the deformation behavior and the mechanical properties of these laminates. This article addresses how the UFG boundaries and the layer interfaces affect the mechanical properties under monotonic and cyclic loading, and discusses the relevant deformation mechanisms.

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“…Within the last decade, many studies on different materials classes, microstructures and environmental influences were reported in literature. Due to the limited amount of required material, especially the severe plastic deformation (SPD) 4 and thin film 5 , 6 communities used nanoindentation to gain information on the microstructure dependent deformation behavior of many face-centered cubic (FCC), 7 – 16 body-centered cubic (BCC), 17 – 21 and some hexagonal closed packed (HCP) 22 – 25 metals. Also the SRS of nanocomposites such as Cu-Nb, 26 nanoporous Cu and Au, 27 , 28 or nowadays high-entropy alloys (HEA) 29 , 30 were successfully investigated by nanoindentation.…”

Section: Introductionmentioning

confidence: 99%

Advanced Nanoindentation Testing for Studying Strain-Rate Sensitivity and Activation Volume

Maier–Kiener

Durst

2017

JOM

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Nanoindentation became a versatile tool for testing local mechanical properties beyond hardness and modulus. By adapting standard nanoindentation test methods, simple protocols capable of probing thermally activated deformation processes can be accomplished. Abrupt strain-rate changes within one indentation allow determining the strain-rate dependency of hardness at various indentation depths. For probing lower strain-rates and excluding thermal drift influences, long-term creep experiments can be performed by using the dynamic contact stiffness for determining the true contact area. From both procedures hardness and strain-rate, and consequently strain-rate sensitivity and activation volume can be reliably deducted within one indentation, permitting information on the locally acting thermally activated deformation mechanism. This review will first discuss various testing protocols including possible challenges and improvements. Second, it will focus on different examples showing the direct influence of crystal structure and/or microstructure on the underlying deformation behavior in pure and highly alloyed material systems.

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Global and local strain rate sensitivity of bimodal Al-laminates produced by accumulative roll bonding

Cited by 37 publications

References 35 publications

Mechanical properties of copper/bronze laminates: Role of interfaces

Mechanical properties of copper/bronze laminates: Role of interfaces

The Role of Interfaces on the Deformation Mechanisms in Bimodal Al Laminates Produced by Accumulative Roll Bonding

Advanced Nanoindentation Testing for Studying Strain-Rate Sensitivity and Activation Volume

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