Effect of nickel on the formation of γ/γ’ microstructures in WC/Co-Ni-Al-W

Edtmaier, Christian; Wolf, Maximilian; Calderon, Raquel de Oro; Schubert, Wolf‐Dieter

doi:10.1016/j.ijrmhm.2021.105652

Cited by 19 publications

(16 citation statements)

References 19 publications

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“…Nickel stabilizes the c' phase, which was discussed extensively here and in a previous paper [40] and can again be identified in Fig. 9b for a cobalt-to-nickel ratio of 85:15.…”

Section: Discussion/summarysupporting

confidence: 73%

“…The detailed description for the preparation of superalloys can be found in a previous paper [40]. The powder mixtures were prepared by mixing the starting powders of WC (mean particle size = 5.65 lm, Wolfram Bergbau und Hu ¨tten AG, Austria), tungsten (0.99 lm, Wolfram Bergbau und Hu ¨tten AG, Austria), cobalt (Co S160/505, Ceratizit,\ 1 lm), nickel (VALE Nickel Powder Type 123 Premium Grade, Hart Materials Ltd. UK, approx.…”

Section: Materials Preparation and Characterizationmentioning

confidence: 99%

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Influence of carbon on the formation of γ/γ′ microstructure and κ-phase in the WC/Co–Ni–Al–W system: ab initio calculations and experimental studies

2022

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Modifications of the binder phase (γ) of cemented carbides have the potential to increase the hardness and wear resistance of the whole material. Partially, coherent precipitations with L12 structure (γ’) promise these improved properties without sacrificing tensile strength or toughness. γ’ is a metastable phase in the Al–Co–W ternary system in the form of Co3(Al,W) which is stabilized by the substitution of cobalt with nickel. Superalloys of the composition Co–(30Ni)–9Al–7 W with different carbon contents were prepared by inductive melting, and the resulting microstructures were analysed using SEM–EDS, XRD and Vickers hardness. Cemented carbides with γ/γ’ binder microstructure were prepared via DTA, and the phase equilibria in the composite material were investigated experimentally and in silico. It was shown that nickel stabilizes the γ’ phase in superalloys as well as in cemented carbides. Carbon leads to the formation of an additional phase with E21 structure (κ). DTA measurements of cemented carbides with different aluminium–cobalt–nickel mixtures as binder gave an overview of the compositional influence. Enthalpies of formation for compounds with L12 and E21 structure were calculated using ab initio methods and compared to experimental results. Graphical Abstract

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“…Nickel stabilizes the c' phase, which was discussed extensively here and in a previous paper [40] and can again be identified in Fig. 9b for a cobalt-to-nickel ratio of 85:15.…”

Section: Discussion/summarysupporting

confidence: 73%

Section: Materials Preparation and Characterizationmentioning

confidence: 99%

Influence of carbon on the formation of γ/γ′ microstructure and κ-phase in the WC/Co–Ni–Al–W system: ab initio calculations and experimental studies

2022

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“…The difference in entropy and atomic structure between the respective single metals makes it easier to form single crystals of their respective components rather than alloys. Because the atomic numbers and structures of Ni/Co elements are similar, it is feasible to add a small amount of Co to Ni-based single crystals to synthesize NiCo alloys. , Due to the strong interaction between different metals, the electronic structure of each component of the alloy can be effectively regulated . The adsorption type of Li 2 S 4 after alloying metal single crystals from physisorption to chemisorption has also been reported .…”

Section: Introductionmentioning

confidence: 99%

MOF-Derived Hollow Carbon Supported Nickel-Cobalt Alloy Catalysts Driving Fast Polysulfide Conversion for Lithium-Sulfur Batteries

Zhang

Lei

et al. 2023

ACS Appl. Mater. Interfaces

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Transition-metal compounds can be used as electrocatalysts to expedite polysulfide conversion effectively in lithiumsulfur batteries. However, insufficient conductivity and tedious preparation process still limit their practical applications. In this work, NiCo alloy nanoparticles embedded in hollow carbon spheres (NiCo@HCS) are fabricated via a facile, template-free strategy from the NiCo-metal−organic framework (MOF) precursor and used as electrocatalysts for separator modification. NiCo@HCS can not only improve the adsorption capacity of polysulfides by d-band deviation to the Fermi level but also reduce the energy barrier in the process of catalytic polysulfide conversion. Due to favorable three-dimensional (3-D) morphology, improved adsorption, and promoted kinetics of NiCo@HCS, the battery containing the NiCo@HCS-modified separator gives a starting capacity of 1377 mAh g −1 at 0.2C, which is retained by 72% over 500 charge/discharge operations at 1.0C current density. Moreover, the battery's start capacity reaches 1180 mAh g −1 (5.9 mAh cm −2 ) with a high sulfur content of 5.0 mg cm −1 at 0.2C.

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“…Research is continuing in the direction of studying the use of traditional and alternative binders based on the combination of iron and aluminum [ 19 ], Co and Ni 3 Al [ 20 ], Fe/Ni [ 21 ], as well as alternative binders based on metals with high melting temperatures accompanied by a phase formation during spark plasma sintering (SPS) reaction [ 22 ]. There are known cases of the application of complex medium-entropic compositions of hardened combined binders, including those used to manufacture alloys of high-tech products such as gas turbines [ 23 ]. Chromium-based transition metal borides (CrB 2 [ 24 ]) are used to manufacture metal-cutting tools suitable for work in extreme conditions.…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

et al. 2022

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The paper describes the method for producing WC-10wt%Co hard alloy with 99.6% of the theoretical density and a Vickers hardness of ~1400 HV 0.5. Experimental data on densification dynamics, phase composition, morphology, mechanical properties, and grain size distribution of WC-10%wtCo using spark plasma sintering (SPS) within the range of 1000–1200 °C are presented. The high quality of the product is provided by the advanced method of high-speed powder mixture SPS-consolidation at achieving a high degree of densification with minimal calculated grain growth at 1200 °C.

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Effect of nickel on the formation of γ/γ’ microstructures in WC/Co-Ni-Al-W

Cited by 19 publications

References 19 publications

Influence of carbon on the formation of γ/γ′ microstructure and κ-phase in the WC/Co–Ni–Al–W system: ab initio calculations and experimental studies

Influence of carbon on the formation of γ/γ′ microstructure and κ-phase in the WC/Co–Ni–Al–W system: ab initio calculations and experimental studies

MOF-Derived Hollow Carbon Supported Nickel-Cobalt Alloy Catalysts Driving Fast Polysulfide Conversion for Lithium-Sulfur Batteries

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

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