Reaction zone formed during diffusion bonding of TiNi to Ti6Al4V using Ni/Ti nanolayers

Simões, Sónia; Viana, Filomena; Ramos, Adriana; Vieira, M. Teresa; Vieira, Manuel F.

doi:10.1007/s10853-013-7592-2

Cited by 39 publications

(30 citation statements)

References 25 publications

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“…This approach does not require a braze or solder insert and often uses the multilayer as a "reactive filler". High strengths have been obtained when using Ni/Ti, Ni/Al, and Ti/Al multilayers [239,241,242,245].…”

Section: Joiningmentioning

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: Joiningmentioning

confidence: 99%

Reactive multilayers fabricated by vapor deposition: A critical review

2015

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“…In recent years, several unconventional bonding techniques and even novel approaches have been intensively investigated [9][10][11][12][13][14][15][16][17][18]. These new approaches have been pointed out as being the best solution for dissimilar bonding of titanium alloys to other materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Dissimilar Titanium Alloys Joints Using Ni/Al Nanolayers

Simões

Viana

Ramos

et al. 2018

Metals

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This study demonstrates the potential of the use of Ni/Al nanolayers for joining dissimilar titanium alloys. For this purpose, a detailed microstructural characterization of the diffusion bonding interfaces of TiAl to Ti6Al4V, TiAl to TiNi and TiNi to Ti6Al4V was carried out. The nanolayers (alternated aluminum and nickel (Ni-7V wt.%) layers) were deposited onto the base material surfaces. Diffusion bonding was performed at 700 and 800 °C under pressures ranging from 5 to 40 MPa and at dwell times between 60 and 180 min. Microstructural characterization was performed using high resolution transmission and scanning electron microscopies. The results revealed that dissimilar titanium joints (TiAl to Ti6Al4V, TiAl to TiNi and TiNi to Ti6Al4V) assisted by Ni/Al nanolayers can be obtained successfully at 800 °C for 60 min using a pressure of 20 MPa. The bond interfaces are thin (less than 10 µm) and mainly composed of NiAl grains with a few nanometric grains of Al8V5. Thin layers of Al-Ni-Ti intermetallic compounds were formed adjacent to the base materials due to their reaction with the nanolayers.

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“…1,2 TiNi thin films have been successfully applied to sensors, actuators, and microvalves in microelectromechanical systems [3][4][5][6] and medical implants in human body. 7,8 The intrinsic disadvantage in manufacturing TiNi alloys is that they respond slowly to the deformation due to their limitation in the cooling ratio, whereas manufacturing TiNi alloys in thin films can dramatically minimize the disadvantage.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiNi films by diffusion technology and the study of the formation sequence of the intermetallics in Ti–Ni systems

et al. 2014

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This study presented a novel fabrication process for TiNi thin films by vacuum diffusion technology using reactive Ni/Ti/Ni multilayer thin films. The sandwiched thin films were prepared by chemical nickel plating. Ni/Ti/Ni multilayer films were heat treated for various diffusion times and temperatures and the influences of the temperature and diffusion time on the interdiffusion behavior of the Ti-Ni system were researched in detail. The results showed that a homogeneous TiNi thin film was obtained at 1173 K with a diffusion time of 4 h. Moreover, the formation sequence of the intermetallics in the Ti-Ni diffusion system was investigated by thermodynamic analysis and experiment. It was found that three compounds -TiNi 3 , Ti 2 Ni, and TiNi -formed in the diffusion process at the Ti/Ni interfaces. More importantly, the nucleation of TiNi 3 and Ti 2 Ni was prior to that of TiNi because of the lower reaction Gibbs free energy and increasing interface energy of TiNi 3 and Ti 2 Ni.

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Reaction zone formed during diffusion bonding of TiNi to Ti6Al4V using Ni/Ti nanolayers

Cited by 39 publications

References 25 publications

Reactive multilayers fabricated by vapor deposition: A critical review

Reactive multilayers fabricated by vapor deposition: A critical review

Microstructural Characterization of Dissimilar Titanium Alloys Joints Using Ni/Al Nanolayers

Preparation of TiNi films by diffusion technology and the study of the formation sequence of the intermetallics in Ti–Ni systems

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