Thermodynamic and atomistic modeling of irradiation-induced amorphization in nanosized metal–metal multilayers

Liu, B.X.; Li, Z.C.; Gong, Huiling

doi:10.1016/j.surfcoat.2004.08.074

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…They are also used for a variety of biomedical − and chemical − applications. The conventional methods for preparation of amorphous alloys include rapid solidification, , ion irradiation, − mechanical alloying, − and chemical reduction. − , Characteristics such as number of the components, atomic size mismatch, heats of mixing for the constituent elements, and cohesion between the metals play key roles in the formation of amorphous metallic materials. ,, …”

Section: Introductionmentioning

confidence: 99%

Exothermic Self-Sustained Waves with Amorphous Nickel

Manukyan¹,

Shuck²,

Cherukara

et al. 2016

J. Phys. Chem. C

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The synthesis of amorphous Ni (a-Ni) using a liquid-phase chemical reduction approach is reported. Detailed structural analysis indicates that this method allows for efficient fabrication of high surface area (210 m 2 /g) amorphous Ni nanopowder with low impurity content. We investigated the selfpropagating exothermic waves associated with crystallization of Ni from the amorphous precursor. Time-resolved X-ray diffraction indicates that amorphous nickel crystallizes in the temperature range 445−480 K. High-speed infrared imaging reveals that local preheating of compressed a-Ni nanopowder triggers a selfsustaining crystallization wave that propagates with velocity ∼0.3 mm/s. The maximum temperature of crystallization wave depends on the sample density and can be as high as 600 K. The Kissinger approach is used to determine the apparent activation energy (55.4 ± 4 kJ/mol) of crystallization. The self-diffusion activation energy of Ni atoms in a-Ni is ∼60 kJ/mol, determined through molecular dynamics (MD) simulations. This agreement of experimentally derived and theoretically calculated activation energies allows us to conclude that self-diffusion of Ni atoms is the rate-limiting stage for crystallization. Furthermore, utilization of amorphous metal as a reactant significantly increases the rate of solid-state reactions. For example, in reactive intermetallic forming systems, such as Ni + Al, the self-sustaining reaction propagation velocity with a-Ni is twice higher than with crystalline Ni of the same morphology. Additionally, using a-Ni increases the maximum reaction temperature in the Ni + Al system by 300 K.

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Section: Introductionmentioning

confidence: 99%

Exothermic Self-Sustained Waves with Amorphous Nickel

Manukyan¹,

Shuck²,

Cherukara

et al. 2016

J. Phys. Chem. C

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Improvement in Cr Nanoparticle Content in Ni–Cr Film by Co-deposition with Combined Surfactant HPB and CTAB

Qin

Huang

2017

Acta Metall. Sin. (Engl. Lett.)

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The effects of single surfactant hexadecylpyridinium bromide (HPB) and cetyltrimethylammonium bromide (CTAB) and the combination of HPB and CTAB on the Cr nanoparticle content in the Ni-Cr film prepared by codeposition were investigated. Single HPB/CTAB addition inhibited the oxidation and amorphous transformation of the Cr nanoparticles in the plating bath and effectively stabilized the Cr nanoparticles content at approximately 10 mass% as a function of time. Moreover, the combination of HPB and CTAB formed a cylindrical micelle structure on the Cr nanoparticle surface, which prompted the formation of a layer of NiCr 2 O 4. As a result, the Cr nanoparticle content increased sharply to 20 mass%.

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