Effect of overall composition on thermally induced solid-state transformations in thick EB PVD Al/Ni multilayers

Ustinov, А.I.; Olikhovska, L.; Melnichenko, T.V.; Shyshkin, A.

doi:10.1016/j.surfcoat.2008.01.024

Cited by 27 publications

(8 citation statements)

References 35 publications

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“…Primarily, these experiments utilize slow heating (with dT/dt~1-10 K/s) to induce changes in phase and structure [69,78,91,117,152,161,[184][185][186][187][188]. Phases are examined either during heating using a method such as hot-stage X-ray diffraction (XRD) [189] or after rapid quenching following an observed exotherm [58,161].…”

Section: Phase Evolution During Steady Propagating Reactionsmentioning

confidence: 99%

Reactive multilayers fabricated by vapor deposition: A critical review

2015

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a b s t r a c t a r t i c l e i n f o Available online xxxxReactive multilayer thin films are a class of energetic materials that continue to attract attention for use in joining applications and as igniters. Generally composed of two reactants, these heterogeneous solids can be stimulated by an external source to promptly release stored chemical energy in a sudden emission of light and heat. In this critical review article, results from recent investigations of these materials are discussed. Discussion begins with a brief description of the vapor deposition techniques that provide accurate control of layer thickness and film composition. More than 50 reactive film compositions have been reported to date, with most multilayers fabricated by magnetron sputter deposition or electron-beam evaporation. In subsequent sections, we review how multilayer ignition threshold, reaction rate, and total heat are tailored via thin film design. For example, planar multilayers with nanometer-scale periodicity exhibit rapid, self-sustained reactions with wavefront velocities up to 100 m/s. Numeric and analytical models have elucidated many of the fundamental processes that underlie propagating exothermic reactions while demonstrating how reaction rates vary with multilayer design. Recent, time-resolved diffraction and imaging studies have further revealed the phase transformations and the wavefront dynamics associated with propagating chemical reactions. Many reactive multilayers (e.g., Co/Al) form product phases that are consistent with published equilibrium phase diagrams, yet a few systems, such as Pt/Al, develop metastable products. The final section highlights current and emerging applications of reactive multilayers. Examples include reactive Ni(V)/Al and Pd/Al multilayers which have been developed for localized soldering of heat-sensitive components.

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Section: Phase Evolution During Steady Propagating Reactionsmentioning

confidence: 99%

Reactive multilayers fabricated by vapor deposition: A critical review

2015

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“…[5][6][7] To circumvent these known issues, SHS of multilayers produced via thin-film growth techniques (sputtering or evaporative deposition) in vacuum has been pursued, where control over voids and contamination is well established. 30 Reactive multilayers have emerged as a useful means for synthesizing novel intermetallic compounds and alloys, [31][32][33][34][35][36][37][38] and they have been used for specialized joining applications. 35,[39][40][41][42][43][44][45] In the current study, the SHS of vapor-deposited Y/Ag, Y/Au, Y/Cu, Sc/Ag, Sc/Au, and Sc/Cu multilayers is presented.…”

Section: Introductionmentioning

confidence: 99%

Rare-earth transition-metal intermetallic compounds produced via self-propagating, high-temperature synthesis

et al. 2010

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Several binary intermetallic compounds-each containing a rare-earth (RE) element paired with a transition metal (TM)-were prepared by self-propagating, high-temperature synthesis (SHS). Thin multilayers, composed of alternating Sc or Y (RE element) and Ag, Cu, or Au (TM), were first deposited by direct current magnetron sputtering. Once the initially distinct layers were stimulated and caused to mix, exothermic reactions propagated to completion. X-ray diffraction revealed that Sc/Au, Sc/Cu, Y/Au, and Y/Cu multilayers react in vacuum to form single-phase, cubic B2 structures. Multilayers containing Ag and a RE metal formed cubic B2 (RE)Ag and a minority (RE)Ag 2 phase. The influence of an oxygen-containing environment on the reaction dynamics and the formation of phase were investigated, providing evidence for the participation of secondary combustion reactions during metal-metal SHS. High-speed photography demonstrated reaction propagation speeds that ranged from 0.1-40.0 m/s (dependent on material system and foil design). Both steady and spin-like reaction modes were observed.

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“…The microcrystal superalloy sheets canbe fabricated by electron-beam physical vapor deposition (EB PVD) method because the technique can provide deposition rate up to 100 nm/s [8] . And the materials produced by EB PVD technique are dense with controlled compositions and microstructures 7,8 . Since the size of grains is smaller, grain growth can occur during either deposition of the film or subsequent heat treatment 9 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Electron Beam Physical Vapour Deposited Ni-23.5Cr-2.66Co-1.44Al Superalloy Sheet During Annealing at 600 °C

Zhang

Zhong

et al. 2012

Mat. Res.

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Microstructure evolution of electron beam physical vapour deposited (EB-PVD) Ni-23.5Cr-2.66Co-1.44Al superalloy sheet during annealing at 600 °C was investigated. The results showed that the as-deposited alloy was composed of only γ phase. After annealing at 600 °C, the locations of diffraction peaks were still the same. The (220) diffraction peak of the deposition side increased with annealing time. The sheet on deposited side had a tendency toward forming (220) texture during post-annealing. No obvious texture was observed at as-deposited and annealed sheet at 600 °C in substrate side. The count and size of "voids" decreased with time. The size of grains increased obviously with annealing time. The ultimate tensile strength of EB-PVD Ni-23.5Cr-2.66Co-1.44Al alloy sheet increased from 641 MPa to 829 MPa after annealing at 600 °C for 30 hours.

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Effect of overall composition on thermally induced solid-state transformations in thick EB PVD Al/Ni multilayers

Cited by 27 publications

References 35 publications

Reactive multilayers fabricated by vapor deposition: A critical review

Reactive multilayers fabricated by vapor deposition: A critical review

Rare-earth transition-metal intermetallic compounds produced via self-propagating, high-temperature synthesis

Microstructure Evolution of Electron Beam Physical Vapour Deposited Ni-23.5Cr-2.66Co-1.44Al Superalloy Sheet During Annealing at 600 °C

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