&lt;i&gt;Ab Initio&lt;/i&gt; Prediction of Atomic Location of Third Elements in B2-Type TiNi

Yamamoto, Sumio; Yokomine, Tomohito; Satō, Kazunori; Terai, Tomoyuki; Fukuda, Takashi; Kakeshita, Tomoyuki

doi:10.2320/matertrans.m2017333

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…% Ni). According to the literature, in B2-NiTi vanadium can be located in Ni-substitutional site, as well as in Ti-substitutional site [29]. Therefore, a Ni:Ti atomic ratio close to 1 should be obtained, in order to guarantee that upon heating B2-NiTi is formed.…”

Section: Deposition Of Ni/ti Multilayer Thin Filmsmentioning

confidence: 99%

Diffusion Bonding of Ti6Al4V to Al2O3 Using Ni/Ti Reactive Multilayers

Silva

Ramos

Vieira

et al. 2021

Metals

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This paper aims to investigate the diffusion bonding of Ti6Al4V to Al2O3. The potential of the use of reactive nanolayered thin films will also be investigated. For this purpose, Ni/Ti multilayer thin films with a 50 nm modulation period were deposited by magnetron sputtering onto the base materials. Diffusion bonding experiments were performed at 800 °C, under 50 MPa and a dwell time of 60 min, with and without interlayers. Microstructural characterization of the interface was conducted through scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS). The joints experiments without interlayer were unsuccessful. The interface is characterized by the presence of a crack close to the Al2O3 base material. The results revealed that the Ni/Ti reactive multilayers improved the diffusion bonding process, allowing for sound joints to be obtained at 800 °C for 60 min. The interface produced is characterized by a thin thickness and is mainly composed of NiTi and NiTi2 reaction layers. Mechanical characterization of the joint was assessed by hardness and reduced Young’s modulus distribution maps that enhance the different phases composing the interface. The hardness maps showed that the interface exhibits a hardness distribution similar to the Al2O3, which can be advantageous to the mechanical behavior of the joints.

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Section: Deposition Of Ni/ti Multilayer Thin Filmsmentioning

confidence: 99%

Diffusion Bonding of Ti6Al4V to Al2O3 Using Ni/Ti Reactive Multilayers

Silva

Ramos

Vieira

et al. 2021

Metals

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“…The Ni target has vanadium to eliminate its ferromagnetism [32]. As the third element in B2 -NiTi (cubic austenite phase), vanadium can be in both Ni and Ti substitutional sites [33]. The distance between the targets and substrates' surface was 90 and 75 mm for Ni and Ti targets, respectively.…”

Section: Deposition Of Ni/ti Nanomultilayer Thin Filmsmentioning

confidence: 99%

Joining of Ti6Al4V to Al2O3 Using Nanomultilayers

et al. 2022

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Diffusion bonding of Ti6Al4V to Al2O3 using Ni/Ti reactive nanomultilayers as interlayer material was investigated. For this purpose, Ni/Ti multilayer thin films with 12, 25, and 60 nm modulation periods (bilayer thickness) were deposited by d.c. magnetron sputtering onto the base materials’ surface. The joints were processed at 750 and 800 °C with a dwell time of 60 min and under a pressure of 5 MPa. Microstructural characterization of the interfaces was conducted by scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). The mechanical characterization of the joints was performed by nanoindentation, and hardness and reduced Young’s modulus distribution maps were obtained across the interfaces. The joints processed at 800 °C using the three modulation periods were successful, showing the feasibility of using these nanolayered films to improve the diffusion bonding of dissimilar materials. Using modulation periods of 25 and 60 nm, it was also possible to reduce the bonding temperature to 750 °C and obtain a sound interface. The interfaces are mainly composed of NiTi and NiTi2 phases. The nanoindentation experiments revealed that the hardness and reduced Young’s modulus at the interfaces reflect the observed microstructure.

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Ductility reduction upon cobalt substitution in B2 NiTi

John

Umamaheshwari

2023

Computational Materials Science

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<i>Ab Initio</i> Prediction of Atomic Location of Third Elements in B2-Type TiNi

Cited by 5 publications

References 29 publications

Diffusion Bonding of Ti6Al4V to Al2O3 Using Ni/Ti Reactive Multilayers

Diffusion Bonding of Ti6Al4V to Al2O3 Using Ni/Ti Reactive Multilayers

Joining of Ti6Al4V to Al2O3 Using Nanomultilayers

Ductility reduction upon cobalt substitution in B2 NiTi

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