Selective dissolution of amorphous Zr–Cu–Ni–Al alloys

Mihaylov, Lyuben; Lyubenova, Lyudmila; Gerdjikov, Ts.; Nihtianova, D.; Spassov, Тony

doi:10.1016/j.corsci.2015.02.031

Cited by 22 publications

(6 citation statements)

References 42 publications

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“…The crystal growth in this film is influenced by the presence of fine crystals, as it has been demonstrated with bulk metallic glasses [31][32][33]. Here, the enhanced intensity of the (220) diffraction peak after dealloying suggests that crystals with (220) orientation originally embedded in the amorphous phase constitute heterogeneous seeds for growth of Au crystals with preferential orientation (Fig.2).…”

Section: Mechanism Of Dealloyingsupporting

confidence: 59%

Microstructure and electrochemical properties of nanoporous gold produced by dealloying Au-based thin film nanoglass

et al. 2018

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Section: Mechanism Of Dealloyingsupporting

confidence: 59%

Microstructure and electrochemical properties of nanoporous gold produced by dealloying Au-based thin film nanoglass

et al. 2018

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“…These combined properties of metallic glasses provide a promising route to obtain nanoporous metals with uniform microstructure by dealloying. The use of metallic glasses as precursors to fabricate nanoporous noble metals, such as Pd, Au and Cu, has been demonstrated in previous work [21][22][23][24][25]. However, the fabrication of technically important but chemically active metals, such as Ni and Co by dealloying metallic glasses for electrochemical energy storage, is still a challenging target.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical nanoporous metal/metal-oxide composite by dealloying metallic glass for high-performance energy storage

et al. 2015

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A free-standing nanoporous YNiCo metal/metal-oxide composite with hierarchical porosity is fabricated by chemically dealloying Al85Y6Ni6Co3 metallic glass in alkaline solutions. The mixed core-shell-like metal/metal-oxide structure formed during dealloying due to the active properties of these metals. Time-dependent etching experiments suggest that the formation of large and small pores occur simultaneously, which may be related to the different dissolution rate of Al at different sites. The nanoporous composite with a highly conductive metal core exhibits a high areal capacitance. Moreover, this strategy can be extended to fabricate other nanoporous composites considering that the composition of metallic glass can be easily tuned.

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“…Figure 5a shows the polycrystalline SAED pattern of Al PDF 89-4037 a = 4.0490 Å SG Fm-3m. The image in diffraction mode confirms the presence of submicron-sized particles (spots along the polycrystalline rings) (Figure 5a), and the HRTEM image Figure 5b shows two areas of Al 4 C 3 crystallographic phase (Al 4 C 3 PDF 79-1736 a = 3.3350 Å, c= 24.9670 Å SG R-3m) with d 001 = 2.50 nm and d 002 = 1.25 nm [32,33]. The size of the particles is about 20 nm.…”

Section: Tem and Hrtemmentioning

confidence: 54%

Fabrication and Characterization of Aluminum-Graphene Nano-Platelets—Nano-Sized Al4C3 Composite

Lazarova

Mourdjeva

Nihtianova

et al. 2022

Metals

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Reinforcement of aluminum and aluminum alloys with graphene has been intensively practiced by researchers in the past dozen years. The role of Al4C3, which could be produced unintentionally or purposefully during the composite production, was controversial until it was found that nano-sized carbides were beneficial for strengthening the composites. aluminum-graphene-nano-sized Al4C3 composites were produced by us using the powder metallurgical method and subsequent annealing. The microstructure was investigated using light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and high resolution transmission electron microscopy HRTEM. Nano-sized carbides were found at the interface aluminum-graphene. The formation of a chemical bond between aluminum and graphene during annealing was proved. Lower values of the microhardness and strength characteristics of the composites after extrusion and subsequent annealing during which nano-sized carbides are formed were found in comparison with those obtained after extrusion. It could be supposed that the annealing processes contribute more to the reduction in microhardness and strength characteristics than nano-sized carbides contribute to its increase. The presence of a strong chemical bond between the graphene and the aluminum is manifested in the failure pattern, which is characterized by graphene nano-platelets and nano-sized carbides fracture and semi-pulled out or semi-slipped Al4C3 from the matrix.

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Selective dissolution of amorphous Zr–Cu–Ni–Al alloys

Cited by 22 publications

References 42 publications

Microstructure and electrochemical properties of nanoporous gold produced by dealloying Au-based thin film nanoglass

Microstructure and electrochemical properties of nanoporous gold produced by dealloying Au-based thin film nanoglass

Hierarchical nanoporous metal/metal-oxide composite by dealloying metallic glass for high-performance energy storage

Fabrication and Characterization of Aluminum-Graphene Nano-Platelets—Nano-Sized Al4C3 Composite

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