Nanocrystalline materials: A study of WC-based hard metals

Berger, S.; Porat, R.; Rosen, R.S.

doi:10.1016/s0079-6425(97)00021-2

Cited by 127 publications

(49 citation statements)

References 8 publications

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“…2,3 In general, reducing WC grain size improves mechanical properties, increasing hardness, wear behaviour and transverse rupture strength without compromising toughness. 4,5 Traditionally WC-Co cermets have been produced by sintering of micrometric powders (1-4 mm). Looking for higher mechanical properties and the needed of smaller and higher precision tooling has led to the use of finer powders, being classified as submicrometric (,0?6 mm) and ultrafine (,0?3 mm) which have showed their excellent potential of improvement.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

et al. 2011

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In this work ultrafine and nanocrystalline WC-Co mixtures were obtained by low energy milling in planetary ball mill. The effect of the processing conditions on the reduction and distribution of the grain sizes and the internal strains level were studied. The characterisation of the powder mixtures was performed by means of scanning and transmission electron microscopy and X-ray diffraction analysis. Observations through SEM and TEM images showed a particle size below 100 nm, after milling. The X-ray diffraction profile analysis revealed a WC phase refined to a crystallite size of 19 nm. The mixtures obtained have been consolidated and mechanical and microstructurally characterised. The results show improvements in resistant behaviour of the material consolidated from nanocrystalline powders, in spite of the grain growth experienced during the sintering. The best results were found for the material obtained by wet milling during 100 h, which presents values of hardness higher than 1800 HV.

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Section: Introductionmentioning

confidence: 99%

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

et al. 2011

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“…7,8) Since they possess a high strength and hardness as well as excellent ductility and toughness, they have garnered more attention recently. 9,10) Recently, nanocrystalline powders have been produced by high-energy milling. 11,12) The sintering temperature of high-energy mechanically milled powder is lower than that of unmilled powder due to the increased reactivity, internal and surface energies, and surface area of the milled powder, which contribute to its so-called mechanical activation.…”

Section: Introductionmentioning

confidence: 99%

Effect of FeAl on Mechanical Properties and Consolidation of Nanostructured (W,Ti)C by the High Frequency Induction Heating

Kwak

Kim

et al. 2015

Mater. Trans.

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“…As nanomaterials possess high strength, high hardness, excellent ductility and toughness, undoubtedly, more attention has been paid to their potential application. 12,13) Recently, nanocrystalline powders have been produced by high-energy milling. 14,15) The sintering temperature of high-energy mechanically milled powder is lower than that of unmilled powder due to the increased reactivity, internal and surface energies, and surface area of the milled powder, which contribute to its so-called mechanical activation.…”

Section: Introdutionmentioning

confidence: 99%

Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

Kang¹,

Shon²

2014

Korean. J. Mater. Res.

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The current concern about these materials (MoSi 2 and NbSi 2 ) focuses on their low fracture toughness below the ductile-brittle transition temperature. To improve the mechanical properties of these materials, the fabrication of nanostructured and composite materials has been found to be effective. Nanomaterials frequently possess high strength, high hardness, excellent ductility and toughness, and more attention is being paid to their potential application. In this study, nanopowders of Mo, Nb, and Si were fabricated by high-energy ball milling. A dense nanostructured MoSi 2 -NbSi 2 composite was simultaneously synthesized and sintered within two minutes by high-frequency induction heating method using mechanically activated powders of Mo, Nb, and Si. The high-density MoSi 2 -NbSi 2 composite was produced under simultaneous application of 80MPa pressure and an induced current. The sintering behavior, mechanical properties, and microstructure of the composite were investigated. The average hardness and fracture toughness values obtained were 1180 kg/mm 2 and 3 MPa·m 1/2 , respectively. These fracture toughness and hardness values of the nanostructured MoSi 2 -NbSi 2 composite are higher than those of monolithic MoSi 2 or NbSi 2 .

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Nanocrystalline materials: A study of WC-based hard metals

Cited by 127 publications

References 8 publications

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

Effect of FeAl on Mechanical Properties and Consolidation of Nanostructured (W,Ti)C by the High Frequency Induction Heating

Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

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