Thermodynamic assessment of the Co–Cr–Ni, Co–Cr–W and Co–Ni–W

Wang, Peisheng; Hu, Biao; Huang, Xiaozhong; C, Zheng

doi:10.1016/j.calphad.2021.102252

Cited by 20 publications

(14 citation statements)

References 43 publications

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“…The mixing enthalpies of Cr, W, and Mo in Ni are −27 kJ/mol (

\overline {\Delta H} _{Cr( {Ni} )}^\infty

), −14 kJ/mol (

\overline {\Delta H} _{W( {Ni} )}^\infty

), and −32 kJ/mol (

\overline {\Delta H} _{Mo( {Ni} )}^\infty

), respectively, 29 and the highest negative value of

\overline {\Delta H} _{Mo( {Ni} )}^\infty

suggests that Ni has the highest affinity for Mo. Therefore, Ni preferentially reacted with Mo to form Ni–Mo IMCs, and Cr and W dissolved in the Ni–Mo IMCs since Mo, Cr, and W are completely mutually soluble with each other 30–32 . According to the Ni–Mo binary phase diagram (see Figure S4) 33 and the EDS results (Table 3), the white IMC is a NiMo phase, and it could be denoted by Ni(Mo, Cr, W).…”

Section: Resultsmentioning

confidence: 99%

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Shen

2022

J Am Ceram Soc.

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A direct current (DC)‐driven transient liquid phase bonding strategy was proposed for joining 3 mol% Y2O3‐stabilized ZrO2 (3YSZ) and GH3128 superalloy with a Ni interlayer. The DC application triggered the rapid formation and diffusion of metallic Zr in 3YSZ and chemical reactions at the 3YSZ/Ni interface. The formed Ni–Zr eutectic liquid well wetted 3YSZ and hence completely filled the bonding gap in seconds. Eutectic structures in the joints were eventually transformed into Ni–Zr intermetallic compounds or a Ni‐based solid solution. The remaining Ni interlayer effectively alleviated residual stress through plastic deformation during cooling stage, and thereby contributed substantially to the high joint strength. Under the joining conditions of a current density of 30 mA/mm2, an energization time of 30 s, and a joining temperature of 1100°C, the obtained joints exhibited a maximum shear strength of 188 ± 8 MPa. This paper proposes an economical and reliable method for the rapid preparation of YSZ/metal joints for high‐temperature applications.

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“…The mixing enthalpies of Cr, W, and Mo in Ni are −27 kJ/mol (

\overline {\Delta H} _{Cr( {Ni} )}^\infty

), −14 kJ/mol (

\overline {\Delta H} _{W( {Ni} )}^\infty

), and −32 kJ/mol (

\overline {\Delta H} _{Mo( {Ni} )}^\infty

), respectively, 29 and the highest negative value of

\overline {\Delta H} _{Mo( {Ni} )}^\infty

Section: Resultsmentioning

confidence: 99%

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Shen

2022

J Am Ceram Soc.

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“…Cr-Co-Ni ternary phase diagram at RT was not found in the literature. The lowest temperature was 800 °C for which Cr-Co-Ni phase diagram was available [ 37 , 38 , 39 ]. For the compositions corresponding to locations Nos.…”

Section: Discussionmentioning

confidence: 99%

“…As mentioned above, room temperature ternary Co-Cr-Ni phase diagram is not accessible in the literature. The available phase diagram at 800 °C suggests that this composition corresponds to a phase mixture consisting of fcc, hcp and tetragonal Σ-phases [ 37 , 38 , 39 ]. When the temperature decreases down to 800 °C, the fcc area in the phase diagram is reduced; therefore, most probably, the experimentally observed full fcc structure in point No.…”

Section: Discussionmentioning

confidence: 99%

Combinatorial Study of Phase Composition, Microstructure and Mechanical Behavior of Co-Cr-Fe-Ni Nanocrystalline Film Processed by Multiple-Beam-Sputtering Physical Vapor Deposition

et al. 2022

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A combinatorial Co-Cr-Fe-Ni compositional complex alloy (CCA) thin film disk with a thickness of 1 µm and a diameter of 10 cm was processed by multiple-beam-sputtering physical vapor deposition (PVD) using four pure metal sources. The chemical composition of the four constituent elements varied between 4 and 64 at.% in the film, depending on the distance from the four PVD sources. The crystal structure, the crystallite size, the density of lattice defects (e.g., dislocations and twin faults) and the crystallographic texture were studied as a function of the chemical composition. It was found that in a wide range of elemental concentrations a face-centered cubic (fcc) structure with {111} crystallographic texture formed during PVD. Considering the equilibrium phase diagrams, it can be concluded that mostly the phase composition of the PVD layer is far from the equilibrium. Body-centered cubic (bcc) and hexagonal-close packed (hcp) structures formed only in the parts of the film close to Co-Fe and Co-Cr sources, respectively. A nanocrystalline microstructure with the grain size of 10–20 nm was developed in the whole layer, irrespective of the chemical composition. Transmission electron microscopy indicated a columnar growth of the film during PVD. The density of as-grown dislocations and twin faults was very high, as obtained by synchrotron X-ray diffraction peak profile analysis. The nanohardness and the elastic modulus were determined by indentation for the different chemical compositions on the combinatorial PVD film. This study is the continuation of a former research published recently in Nagy et al., Materials 14 (2021) 3357. In the previous work, only the fcc part of the sample was investigated. In the present paper, the study was extended to the bcc, hcp and multiphase regions.

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“…That is, chromium atoms appear to be substituting primarily for the similar size cobalt atoms in the μ structure [14]. The thermodynamic calculation results of the Co-Cr-W system by Peisheng Wang et al [15] showed that increasing the dosage of Cr could significantly increase the range of the μ phase. Bartek Kaplan [16] determined the ground state intermetallic phase in the W-Co system by DFT calculation, and a method for constructing a sublattice model for an intermetallic phase, based on energetics, is proposed.…”

Section: Introductionmentioning

confidence: 99%

First-principles study on the preferential sites of Cr in Co₇W₆

Zhao

Huang²,

Tang³

et al. 2023

Mater. Res. Express

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The preferential sites of Cr in the μ-Co7W6 phase and its influence on electronic properties were studied by first-principles calculations based on density functional theory. The calculation results of the formation energy and defect formation energy show that the stability of the system is enhanced when Cr occupies the Co site, which indicates that Cr tends to occupy the Co site of the system. By calculating the density of states, the Hamilton population of crystal orbital, the electron location function and the Bader charge distribution, the reason why Cr preferentially occupied the Co sites is further explained. This is primarily owing to the hybridization of the d-d orbitals of the Cr atom to its adjacent atoms.

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Thermodynamic assessment of the Co–Cr–Ni, Co–Cr–W and Co–Ni–W

Cited by 20 publications

References 43 publications

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Combinatorial Study of Phase Composition, Microstructure and Mechanical Behavior of Co-Cr-Fe-Ni Nanocrystalline Film Processed by Multiple-Beam-Sputtering Physical Vapor Deposition

First-principles study on the preferential sites of Cr in Co₇W₆

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Thermodynamic assessment of the Co–Cr–Ni, Co–Cr–W and Co–Ni–W

Cited by 20 publications

References 43 publications

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Combinatorial Study of Phase Composition, Microstructure and Mechanical Behavior of Co-Cr-Fe-Ni Nanocrystalline Film Processed by Multiple-Beam-Sputtering Physical Vapor Deposition

First-principles study on the preferential sites of Cr in Co7W6

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First-principles study on the preferential sites of Cr in Co₇W₆