Effects of current intensity and cumulative exposure time on the localized current-activated sintering of titanium nickelides

Patel, Mehul; Moon, Kiwon; Kassegne, Sam; Morsi, K.

doi:10.1007/s10853-011-5622-5

Cited by 7 publications

(2 citation statements)

References 31 publications

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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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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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“…Figure 1 shows a schematic of a CATS setup. Recently, CATS has been used to locally sinter different material systems such as nickel and copper powders [6], as well as Ni-Ti intermetallics [7]. It was also recently used to enable an ignition of a macro-scale current-activated combustion synthesis process for Ni-Al powder mixtures which would spontaneously convert to an intermetallic phase [8].…”

Section: Introductionmentioning

confidence: 99%

Green Compact Temperature Evolution during Current-Activated Tip-Based Sintering (CATS) of Nickel

Desouky

Moon

Kassegne

et al. 2013

Metals

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Current-activated tip-based sintering (CATS) is a novel process where spark plasma sintering conditions are applied through an electrically conducting tip on a locally controlled area on a green powder compact/bed. The localization of electric current in CATS allows for unique temporal and spatial current and temperature distributions within the tip and powder compact. In this paper, special experimental setups were used to monitor the temperature profiles in the tip and at multiple locations on the surface of nickel powder compacts. A variation in the initial green density was found to have a significant effect on the maximum temperature in the tip as well as the temperature distribution across the powder compact. In general, the lowest green density specimens displayed the best conditions for localized densification. The concept of effective current density is introduced and results are discussed in relation to the densification parameter.

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Reactive Current-Activated Tip-Based Sintering of Ni–Al Intermetallics

Numula

Kassegne

Moon

et al. 2013

Metallogr. Microstruct. Anal.

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Effects of current intensity and cumulative exposure time on the localized current-activated sintering of titanium nickelides

Cited by 7 publications

References 31 publications

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

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

Green Compact Temperature Evolution during Current-Activated Tip-Based Sintering (CATS) of Nickel

Reactive Current-Activated Tip-Based Sintering of Ni–Al Intermetallics

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