Mechanical properties of hybrid nanocrystalline metal foams

Bouwhuis, B.A.; McCrea, J.L.; Palumbo, G.; Hibbard, G.D.

doi:10.1016/j.actamat.2009.04.053

Cited by 76 publications

(49 citation statements)

References 19 publications

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“…When the connectivity is such that Maxwell's stability criterion is not satisfied (e.g. [7]), failure occurs by bending-dominated mechanisms and the specific strength increase is much lower than what can be obtained if the conformal network of nanocrystalline material satisfies the stability criterion and deformation is stretch-dominated [9]. Finally, there is a level of structure intermediate between the first two, which describes the internal shape factor of the nanocrystalline tubes.…”

Section: Introductionmentioning

confidence: 94%

Failure mechanisms in metal/metal hybrid nanocrystalline microtruss materials

2009

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Section: Introductionmentioning

confidence: 94%

Failure mechanisms in metal/metal hybrid nanocrystalline microtruss materials

2009

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“…To guarantee a homogeneous coating over the cross-section, a cage-like anode filled with Ni pellets (Ampere GmbH, Dietzenbach, Germany), as described by Jung et al [12,13], was used. In contrast to the state of the art in fully coating OCAFs with nickel and nickel alloys [20,21,22] or with copper [23,24,25], the OCAFs in this work were only partially coated. Each partially coated OCAFs sample of 40×40×40 mm 3 was manufactured by submerging only half of the foam in the electrolyte and coating it with 50 µm Ni using a current density of 1.5 mA/cm 2 .…”

Section: Partially and Gradually Coated Ocafsmentioning

confidence: 86%

Open-cell aluminium foams with graded coatings as passively controllable energy absorbers

et al. 2015

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Compared to most bulk materials, open-cell aluminium (Al) foams (OCAFs) are light-weight and can absorb a significant amount of energy in compression, e.g. during impact. When coated with nickel (Ni), OCAFs can absorb even more energy, making them more appropriate for impacts at higher velocities than uncoated OCAFs. When Ni-coated OCAFs experience low-velocity impact however, the stopping distance during the impact is small compared to that of uncoated OCAFs and hence, deceleration occurs fast. This exposes devices (and possibly human beings) protected by OCAFs to large internal forces leading to internal damage. An OCAF that combines the properties of uncoated and coated OCAFs can absorb energy during both low-velocity and high-velocity impact scenarios. This contribution introduces two of such OCAFs which are created by partially and gradually coating OCAFs. The general mechanics of the two OCAFs are revealed using experimental and numerical observation methods.

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“…Recently, it has been shown that coating of open-cell metal foams to build up composites can significantly improve the stiffness, strength and energy absorption capacity [3e7]. Due to their good properties, most work has been done on Ni/Al hybrid foams, consisting of aluminium foams coated with nickel or nickel alloys [3,4,8]. The coating is performed by the electrodeposition of nanocrystalline nickel.…”

Section: Introductionmentioning

confidence: 99%