Mechanical Properties of Metal Nanolaminates

Beyerlein, Irene J.; Li, Zezhou; Mara, Nathan A.

doi:10.1146/annurev-matsci-081320-031236

Cited by 18 publications

(4 citation statements)

References 67 publications

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“…Based on earlier studies, Beyerlein et al [48] have considered the orientation relationship between the incoming and outgoing glide planes on either side of the interface, and the interfacial shear strength as the two key factors that affect dislocation transfer. Whereas, Hoagland et al [49] assumed that a dislocation could not traverse the composite unless the net forces on the dislocation in all layers are the same sign.…”

Section: Deformation Of V/fe Bilayermentioning

confidence: 99%

Atomistic simulation of the influence of semi-coherent interfaces in the V/Fe bilayer system on plastic deformation during nanoindentation

Hamdani,

Abdeslam,

Hartmaier

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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Semi-coherent interfaces can have a strong influence on the mechanical behavior of bilayer systems, which is seen very clearly under indentation conditions where a well-defined plastic zone interacts directly with the interface. The main aim of this work is to study the influence of a semi-coherent bcc/bcc interface in the V/Fe bilayer system with molecular dynamics (MD) simulations. In particular, the influence of the V layer thicknesses on the apparent hardness of the bilayer system is investigated. Our results show that the deformation behavior of pure V and pure Fe resulting from the MD simulations is in good agreement with the literature. Moreover, the MD simulations reveal a significant enhancement of the hardness of V/Fe bilayer system for thinner vanadium layers, resulting from the crucial role of the semi-coherent interface as a barrier to dislocation propagation. This is seen from a detailed analysis of the interaction of mobile dislocations in the plastic zone with misfit dislocations in the interface. Our work shows that dislocation pile-ups at the interface and formation of horizontal shear loops are two key mechanisms dominating the rate and magnitude of plastic deformation and thus contributes to our understanding of mechanical behavior of bilayer systems with semi-coherent interfaces.

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Section: Deformation Of V/fe Bilayermentioning

confidence: 99%

Atomistic simulation of the influence of semi-coherent interfaces in the V/Fe bilayer system on plastic deformation during nanoindentation

Hamdani,

Abdeslam,

Hartmaier

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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“…For multilayer systems which are composed of different crystal structures, such as Cu/Nb multilayers, the different crystal structures at two sides of the interface may lead to discontinuity of the slip system and different slip vectors. The flow strength is determined by the transmission of dislocation from one material to another [20,21]. However, the original crystal structure of the individual material may be changed when the layer thickness is sufficiently small.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Thermally Annealed Cu/Ni and Cu/Al Multilayer Thin Films: Solid Solution vs. Intermetallic Strengthening

Zhou,

Wang

2024

Metals

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In this study, Cu/Ni and Cu/Al multilayers, with individual layer thickness varying from 25 nm to 200 nm, and co-sputtered Cu-Ni and Cu-Al single layer films were deposited at room temperature via magnetron sputtering and further annealed from 100 °C to 300 °C. The mechanical and microstructural properties of the as-deposited and annealed samples were characterized by nanoindentation, x-ray diffraction, and scanning electron microscopy. Both multilayer systems exhibit an increase in hardness with increasing annealing temperature. However, the Cu/Ni system shows a gradual and moderate hardness increase (up to 30%) from room temperature to 300 °C, while the Cu/Al system displays a sharp hardness surge (~150%) between 125 °C and 200 °C. The co-sputtered Cu-Ni and Cu-Al samples consistently demonstrate higher hardness than their multilayered counterparts, albeit with distinctly different temperature dependence—the hardness of Cu-Ni increases with annealing temperature while Cu-Al maintains a constant high hardness throughout the entire temperature range. The distinct thermal strengthening mechanisms observed in the two metallic multilayer systems can be ascribed to the formation of solid solutions in Cu/Ni and the precipitation of intermetallic phases in Cu/Al. This study highlights the unique advantage of intermetallic strengthening in metallic multilayer systems.

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“…A fundamental challenge in the development of efficient engineering materials is to design a material that has both high strength and high toughness, as most materials have exclusively either of these properties. Kinking in nano-metallic laminates is a deformation mechanism that may circumvent this challenge, as it leads to enhanced plasticity (ductility) at an almost constant level of stress after yielding [1]. Kink bands, in the present context of a material with an intrinsic layered structure, refer to a thin band of localized deformation that is transverse-and most commonly not normal-to the intrinsic layering, as shown in Figure 1a.…”

Section: Introductionmentioning

confidence: 99%

Interface-Dominated Plasticity and Kink Bands in Metallic Nanolaminates

Arora

Acharya

2023

Crystals

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The theoretical and computational framework of finite deformation mesoscale field dislocation mechanics (MFDM) is used to understand the salient aspects of kink-band formation in Cu-Nb nano-metallic laminates (NMLs). A conceptually minimal, plane-strain idealization of the three-dimensional geometry, including crystalline orientation, of additively manufactured NML is used to model NMLs. Importantly, the natural jump/interface condition of MFDM imposing continuity of (certain components) of plastic strain rates across interfaces allows theory-driven ‘communication’ of plastic flow across the laminate boundaries in our finite element implementation. Kink bands under layer parallel compression of NMLs in accord with experimental observations arise in our numerical simulations. The possible mechanisms for the formation and orientation of kink bands are discussed, within the scope of our idealized framework. We also report results corresponding to various parametric studies that provide preliminary insights and clear questions for future work on understanding the intricate underlying mechanisms for the formation of kink bands.

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Mechanical Properties of Metal Nanolaminates

Cited by 18 publications

References 67 publications

Atomistic simulation of the influence of semi-coherent interfaces in the V/Fe bilayer system on plastic deformation during nanoindentation

Atomistic simulation of the influence of semi-coherent interfaces in the V/Fe bilayer system on plastic deformation during nanoindentation

Mechanical Properties of Thermally Annealed Cu/Ni and Cu/Al Multilayer Thin Films: Solid Solution vs. Intermetallic Strengthening

Interface-Dominated Plasticity and Kink Bands in Metallic Nanolaminates

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