Kink Band Formation in High-strength Bulk Metallic Nanolaminates

Nizolek, Thomas J.; Mara, Nathan A.; McCabe, Rodney J.; Avallone, Jaclyn T.; Beyerlein, Irene J.; Pollock, Tresa M.

doi:10.1017/s1431927615006571

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Rather, it is expected that the applied compressive stress will produce a local shear stress in regions where the W-lamellae are misaligned with respect to the compression direction. The initial shear and rotation in these regions is the onset for "kink band" formation, a deformed and rotated region within the compressed sample, which is a common deformation mode in anisotropic composites [56][57][58] , such as Cu-Nb nanolaminates 59,60 . This deformation mode is expected in our lamellar structure with mechanical anisotropy under compression.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Ice-Templated W-Cu Composites with High Anisotropy

Röthlisberger

Häberli

Krogh

et al. 2019

Sci Rep

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Controlling anisotropy in self-assembled structures enables engineering of materials with highly directional response. Here, we harness the anisotropic growth of ice walls in a thermal gradient to assemble an anisotropic refractory metal structure, which is then infiltrated with Cu to make a composite. Using experiments and simulations, we demonstrate on the specific example of tungsten-copper composites the effect of anisotropy on the electrical and mechanical properties. The measured strength and resistivity are compared to isotropic tungsten-copper composites fabricated by standard powder metallurgical methods. Our results have the potential to fuel the development of more efficient materials, used in electrical power grids and solar-thermal energy conversion systems. The method presented here can be used with a variety of refractory metals and ceramics, which fosters the opportunity to design and functionalize a vast class of new anisotropic load-bearing hybrid metal composites with highly directional properties.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Ice-Templated W-Cu Composites with High Anisotropy

Röthlisberger

Häberli

Krogh

et al. 2019

Sci Rep

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“…Engineering stress-strain curves obtained from the pillar compression tests for different orientations are shown in Figure 2, where each plot, corresponds to a different pillar geometry, [26]. In the Cu-Nb case, no cracking was observed in the metallic multilayers, and no pronounced load drop occurred as the kink bands developed.…”

Section: Effect Of Layer Orientation On Deformation Morphologymentioning

confidence: 99%

Anisotropy, size, and aspect ratio effects on micropillar compression of Al SiC nanolaminate composites

et al. 2016

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Metal-ceramic nanolaminate composites show promise as high strength and toughness materials. Micropillar compression was used to characterize the mechanical behavior of Al-SiC multilayers in different orientations including loading at 0°, 45° and 90° with respect to the direction of the layers. The 0° orientation showed the highest strength while the 45° orientation showed the lowest strength. Each orientation showed unique deformation behavior. Effects of pillar size and aspect ratio were also studied. Higher compressive strengths were observed in smaller pillars for all orientations. This effect was shown to be due to a lower probability of flaws using Weibull statistics. Additionally, changes in the aspect ratio was shown to have no significant effect on the behavior except an increase in the strain to failure in the 0° orientation. Finite element analysis (FEA) was used to simulate and understand the effect of these parameters on the deformation behavior.

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Kink mechanism in Cu/Nb nanolaminates explored by in situ pillar compression

Zhang

Schneider

et al. 2022

Acta Materialia

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Kink Band Formation in High-strength Bulk Metallic Nanolaminates

Cited by 5 publications

References 5 publications

Ice-Templated W-Cu Composites with High Anisotropy

Ice-Templated W-Cu Composites with High Anisotropy

Anisotropy, size, and aspect ratio effects on micropillar compression of Al SiC nanolaminate composites

Kink mechanism in Cu/Nb nanolaminates explored by in situ pillar compression

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