Layer architecture and fatigue life of ultrafine-grained laminated metal composites consisting of different aluminum alloys

Kümmel, Frank; Höppel, Heinz Werner; Göken, Mathias

doi:10.1016/j.msea.2017.06.105

Cited by 20 publications

(23 citation statements)

References 18 publications

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“…At low stress amplitudes, the resistance against macro‐crack initiation is determining the fatigue life (N i /N f ≈0.95–0.99). After crack initiation the crack propagates very straight across the layer interface, see Figure d–f or reference. Furthermore, the influence of the load transfer on the fatigue life is more pronounced at lower stress amplitudes .…”

Section: Resultsmentioning

confidence: 84%

“…However, very limited data is available in literature on the cyclic mechanical properties of UFG laminated metal composites. Previous investigations by some of the authors of this current paper reveal that the fatigue life of UFG laminated metal composites, consisting of aluminum alloys with different hardness, is significantly enhanced compared to their CG and UFG mono‐material counterparts. On the one hand, this is due to the transformation of the CG microstructure into the UFG regime by SPD.…”

Section: Introductionmentioning

confidence: 67%

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High Lightweight Potential of Ultrafine‐Grained Aluminum/Steel Laminated Metal Composites Produced by Accumulative Roll Bonding

et al. 2018

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The focus of this paper is the designing of ultrafine-grained aluminum/steel laminated metal composites for innovative lightweight materials concepts used for cyclic loading. These ultrafine-grained composites are produced by the accumulative roll bonding process. Three different aluminum/steel composites are studied, where the position of the steel layers is varied, to investigate the influence of the layer architecture. The mechanical properties are measured in monotonic and cyclic three-point bending tests. The influence of the meso-and microstructure are intensively studied by scanning electron microscope observations. Furthermore, the internal stresses during elastic straining are calculated by a finite element simulation. In the composites, both monotonic and cyclic mechanical properties are strongly increased and are clearly higher as expected by a linear rule of mixtures of the constituent materials. This increase is particularly high for the fatigue properties resulting in a strongly enhanced specific fatigue limit of the composites.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 67%

High Lightweight Potential of Ultrafine‐Grained Aluminum/Steel Laminated Metal Composites Produced by Accumulative Roll Bonding

et al. 2018

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“…The increased fatigue life for the L1/8 architecture might be caused by effects of the interface affected zone [ 14 , 68 , 69 ], different shear strain distribution in the respective laminate surface layers during ARB processing [ 70 ] or a complex internal stress state upon cyclic loading due to the co-deformation of different aluminium layers with dissimilar hardness [ 71 ]. The transition between the LCF and HCF regime is correlated to a threshold value which depends on the material of the layer at the surface [ 16 , 32 , 46 ]. Below the threshold, in the HCF regime, the fatigue life of monolithic materials and laminated composites is primarily determined by the fatigue crack initiation stage: The numbers of cycles to crack initiation account for 95% to 99% of the numbers of cycles to failure for both monolithic materials and laminates.…”

Section: Resultsmentioning

confidence: 99%

“…A comprehensive overview of different toughening mechanisms observed in laminated metal composites is provided by Lesuer et al [ 27 ]. In crack arrester orientation, crack deflection [ 30 , 31 , 32 ], crack blunting [ 33 ], crack bridging [ 33 ], and stress redistribution mechanisms were observed in different LMC systems.…”

Section: Introductionmentioning

confidence: 99%

“…A recent study by Kümmel et al [ 46 ] provides a comprehensive overview on the potential of fatigue life enhancement in specifically tailored laminated metal composites by utilizing the inherent material inhomogeneity effects at the interfaces between dissimilar materials. An increase in fatigue life in LMC systems can be accomplished by (a) enhancing resistance against crack initiation based on load transfer from surface layers into adjacent stiffer layers (gradient in elastic properties at interfaces) [ 15 , 16 , 46 ], and (b) enhancing resistance against crack propagation based on toughening mechanisms at the interfaces (gradient in hardness and elastic properties at interfaces) [ 15 , 32 , 47 ].…”

Section: Introductionmentioning

confidence: 99%

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About the Role of Interfaces on the Fatigue Crack Propagation in Laminated Metallic Composites

et al. 2021

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The influence of gradients in hardness and elastic properties at interfaces of dissimilar materials in laminated metallic composites (LMCs) on fatigue crack propagation is investigated experimentally for three different LMC systems: Al/Al-LMCs with dissimilar yield stress and Al/Steel-LMCs as well as Al/Ti/Steel-LMCs with dissimilar yield stress and Young’s modulus, respectively. The damage tolerant fatigue behavior in Al/Al-LMCs with an alternating layer structure is enhanced significantly compared to constituent monolithic materials. The prevalent toughening mechanisms at the interfaces are identified by microscopical methods and synchrotron X-ray computed tomography. For the soft/hard transition, crack deflection mechanisms at the vicinity of the interface are observed, whereas crack bifurcation mechanisms can be seen for the hard/soft transition. The crack propagation in Al/Steel-LMCs was studied conducting in-situ scanning electron microscope (SEM) experiments in the respective low cycle fatigue (LCF) and high cycle fatigue (HCF) regimes of the laminate. The enhanced resistance against crack propagation in the LCF regime is attributed to the prevalent stress redistribution, crack deflection, and crack bridging mechanisms. The fatigue properties of different Al/Ti/Steel-LMC systems show the potential of LMCs in terms of an appropriate selection of constituents in combination with an optimized architecture. The results are also discussed under the aspect of tailored lightweight applications subjected to cyclic loading.

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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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Layer architecture and fatigue life of ultrafine-grained laminated metal composites consisting of different aluminum alloys

Cited by 20 publications

References 18 publications

High Lightweight Potential of Ultrafine‐Grained Aluminum/Steel Laminated Metal Composites Produced by Accumulative Roll Bonding

High Lightweight Potential of Ultrafine‐Grained Aluminum/Steel Laminated Metal Composites Produced by Accumulative Roll Bonding

About the Role of Interfaces on the Fatigue Crack Propagation in Laminated Metallic Composites

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

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