On the mechanism of heterogeneous reaction and phase formation in Ti/Al multilayer nanofilms

Gachon, J.C.; Рогачев, А. С.; Grigoryan, H.E.; Illarionova, E. V.; Kuntz, Josh; Kovalev, D. Yu.; Nosyrev, A. N.; Сачкова, Н. В.; Цыганков, П. А.

doi:10.1016/j.actamat.2004.11.016

Cited by 115 publications

(48 citation statements)

References 13 publications

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“…Advanced fabrication techniques for such systems include physical vapor deposition whereby the individual layers are sputter deposited on a substrate. [2][3][4][5][6][7][8][9] Typically, individual layers have thicknesses in the order of tens of nanometers.…”

Section: Introductionmentioning

confidence: 99%

Development of a reduced model of formation reactions in Zr-Al nanolaminates

Vohra

Winokur

Overdeep

et al. 2014

Journal of Applied Physics

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A computational model of anaerobic reactions in metallic multilayered systems with an equimolar composition of zirconium and aluminum is developed. The reduced reaction formalism of M. Salloum and O. M. Knio, Combust. Flame 157(2): 288–295 (2010) is adopted. Attention is focused on quantifying intermixing rates based on experimental measurements of uniform ignition as well as measurements of self-propagating front velocities. Estimates of atomic diffusivity are first obtained based on a regression analysis. A more elaborate Bayesian inference formalism is then applied in order to assess the impact of uncertainties in the measurements, potential discrepancies between predictions and observations, as well as the sensitivity of predictions to inferred parameters. Intermixing rates are correlated in terms of a composite Arrhenius law, which exhibits a discontinuity around the Al melting temperature. Analysis of the predictions indicates that Arrhenius parameters inferred for the low-temperature branch lie within a tight range, whereas the parameters of the high-temperature branch are characterized by higher uncertainty. The latter is affected by scatter in the experimental measurements, and the limited range of bilayers where observations are available. For both branches, the predictions exhibit higher sensitivity to the activation energy than the pre-exponent, whose posteriors are highly correlated.

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Section: Introductionmentioning

confidence: 99%

Development of a reduced model of formation reactions in Zr-Al nanolaminates

Vohra

Winokur

Overdeep

et al. 2014

Journal of Applied Physics

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“…It should be noted that when using a Ti target with Al inserts, the aluminium solubility is extremely extended (up to 50.5 at.%), while the use of two targets is responsible for a biphasic structure consisting of two solid solutions, one Ti-rich, (a-Ti), and the other Al-rich, (Al). In this case, the deposition procedure gives rise to a nanometric multilayer whose single-layer thickness (period) is a function of the time that the substrates are in front of each target during one rotation [21]. For the lowest aluminium content (27 at.%), the Al-rich single layers are extremely thin (<1 nm) and this element could diffuse into the Ti-rich layers during the deposition process.…”

Section: Ti-almentioning

confidence: 99%

From Ti–Al- to Ti–Al–N-sputtered 2D materials

et al. 2007

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This paper reviews thin films constituted by elements based on the Ti-Al-N system, bearing in mind the role of the condensed phases in the development of structural components and functional devices. In recent decades, the Ti-Al, Ti-N and Al-N nanocrystalline binary systems have rapidly attracted research and industry interest. These systems have revealed a great performance via atomic-level structural control, making it possible to tailor new atomic structures and morphologies suitable in different applications as protective and hard coatings and as thermal/diffusion barriers. The binary phases based on nitrogen were the first to exhibit a wealth of interesting mechanical and electrochemical behaviours. However, more recently the Ti-Al and, particularly, the Ti 1 -x Al x N thin films have been applied with success in the industry. The purpose of this paper is to compile the master results concerning the production and characterisation of binary and ternary thin films of the Ti-Al-N system using similar deposition strategies. These materials form a good base to analyse the correlation between the chemical composition and the atomic structure, the preferred orientations and the morphology of 2D monolithic materials. The deposition strategies adopted and the thin films' chemical compositions determine the as-deposited structures and, consequently, the mechanical behaviour of the thin films produced, particularly the hardness. In general, an intermediary amorphous stage is observed, i.e., the thin films exhibit a loss of crystallinity in the transition from a saturated solid solution to a new compound.

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“…External heating initiates the reaction locally, releasing heat that promotes diffusion and intermixing in adjacent regions, driving the reaction forward in a self-sustained wave. Ni/Al have been the most investigated Me1/Me2 (Me-metal) reactive multilayers, while particular attention has also been paid to nanoscale multilayers from the Ti-Al and Ni-Ti systems, e.g., [4,8,9].…”

Section: Introductionmentioning

confidence: 99%

Coating of Tungsten Wire with Ni/Al Multilayers for Self-Healing Applications

Ramos

Maj

Morgiel

et al. 2017

Metals

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Self-healing materials are able to partially or completely reverse the damage inflicted on them. The possibility of self-healing mechanical and chemical failures that occur during service will improve the lifetime and reliability of structural materials. For this purpose, two main steps must be considered: (i) detection, and (ii) repairing (healing) of cracks. The exothermic character of reactive multilayers has potential for self-healing applications, namely in the healing step. In this context, Ni(V)/Al multilayer thin films were deposited onto tungsten wires by magnetron sputtering from two targets. A detailed microstructural characterization was carried out by scanning and transmission electron microscopy after deposition, as well as after ignition by applying an electrical discharge. The as-deposited films presented an irregular layered structure with local defects not observed for flat substrates, although Ni-and Al-rich nanolayers could be distinguished. The as-reacted films were constituted by Al 3 Ni 2 grains with Al 3 V phase at the grain boundaries. In order to use reactive multilayers for self-healing purposes, the heat released must be maximised by improving the microstructure of the nanolayered films. Nevertheless, after ignition, the Ni(V)/Al multilayer films deposited onto W wire underwent a self-sustained reaction, releasing heat.

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On the mechanism of heterogeneous reaction and phase formation in Ti/Al multilayer nanofilms

Cited by 115 publications

References 13 publications

Development of a reduced model of formation reactions in Zr-Al nanolaminates

Development of a reduced model of formation reactions in Zr-Al nanolaminates

From Ti–Al- to Ti–Al–N-sputtered 2D materials

Coating of Tungsten Wire with Ni/Al Multilayers for Self-Healing Applications

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