Intermetallic phase formation in nanometric Ni/Al multilayer thin films

Noro, Jorge; Ramos, Adriana; Vieira, M.T.

doi:10.1016/j.intermet.2008.06.002

Cited by 71 publications

(44 citation statements)

References 21 publications

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“…The thermodynamic modification is therefore necessary to improve its usability and reliability. Several reactive Al-Ni systems have been produced by methods like combustion synthesis [8], mixing and pressing of powders [9,10], welding [11,12], forging [13], rolling [14,15], vacuum deposition [11,15], cladding [16], and high energy ball milling [17][18][19]. It is well-known fact that the reactivity of these composites depends strongly on their corresponding microstructures.…”

Section: Introductionmentioning

confidence: 99%

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Han

et al. 2018

Metals

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Abstract:The Al-Ni system is known as a high energy density materials (HEDM) because of its highly exothermic nature during intermetallic compound (IMC) formation. In this study, elemental Al and Ni powder were milled to explore the effect of cryomilling atmosphere on the microstructure and exothermic behavior. Scanning electron microscope (SEM) observations show continuous structural refinement up to 8 h of cryomilling. No IMC phase was detected in the X-ray diffraction (XRD) spectrum. Differential thermal analyzer (DTA) results show two exothermic peaks for 8 h cryomilled powder as compared to that of powder milled for 1 h. The ignition temperature of prepared powder mixture also decreased due to gradual structural refinement. The activation energy was also calculated and correlated with the DTA and SEM results. The cryomilled Al-Ni powder is composed of fine Al-Ni metastable junctions which improve the reactivity at a lower exothermic reaction temperature.

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Section: Introductionmentioning

confidence: 99%

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Han

et al. 2018

Metals

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“…cubic NiAl and cubic Ni 3 Al. The hot-stage XRD experiments carried out by Ramos et al [3,5] showed that in the case of Al/Ni multilayers with similar bi-layer thickness (λ = 140 nm), the formation of NiAl is preceded by nucleation of Ni The microstructure observations of the "as-deposited" Ni/Al multilayers revealed that they consist of fine grains of Ni and Al with the average size smaller than the thickness of individual layer (Fig. 3a).…”

Section: Resultsmentioning

confidence: 95%

“…The selfpropagating high-temperature synthesis (SHS) nature of RMM reactions was already commercialized for joining of heat sensitive materials with Ni/Al free-standing foils (NanoFoil ® ). The sequence of phase transformation during heating of RMM was extensively studied with differential scanning calorimetry (DSC) and X-ray diffraction (XRD) especially widely for Ni/Al [1][2][3][4][5][6][7]. They showed that reaction of low period multilayer, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that reaction of low period multilayer, i.e. those with multilayer period λ < 50 nm, directly leads to formation of intermetallic phase like NiAl 3 [6] or NiAl [3,5]. The same heat treatment applied to large period (λ ≈ 100 nm) Ni/Al multilayers of the same Ni:Al ratio resulted in formation of Ni 2 Al 9 intermediate phase [8].…”

Section: Introductionmentioning

confidence: 99%

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XRD and TEM Heating of Large Period Ni/Al Multilayer Coatings

et al. 2016

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The Ni/Al multilayer coating of λ ≈ 100 nm was deposited onto (001)-oriented monocrystalline silicon substrate using double target magnetron sputtering system equipped with rotating sample holder. The thicknesses of alternating layers were adjusted in the way to preserve the chemical composition ratio close to 50%Al:50%Ni (at.%). The in situ X-ray diffraction and in situ transmission electron microscopy heating experiments were carried out at relatively low heating rates (20 • C/min) in order to study the phase transformation sequence. The investigations revealed that the reaction between Ni and Al multilayers starts at ≈200• C with precipitation of Al3Ni phase, while above 300• C dominates precipitation of Ni3Al and NiAl intermetallic phases. Both the X-ray and electron diffractions acquired at 450• C confirmed presence of the Ni3Al and NiAl intermetallics, but the former pointed at still lasting traces of Ni(Al) solid solution.

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“…Recently, various methods for preparation of energetic nanomaterials reported in the literatures mainly focus on physical vapor deposition (PVD) [11], mechanical mixing method [15,16], electrophoretic deposition (EPD) [17], magnetron sputtering [18][19][20], ball milling (BM) [21] etc. Nevertheless, how to fabricate novel energetic coatings with the great resistance to variable environmental conditions on target substrate or chip effectively and rapidly is still a persistent challenge for nearly two decades.…”

Section: Introductionmentioning

confidence: 99%