Microstructure, hardness and toughness of nanostructured and conventional WC-Co composites

Jia, K.; Fischer, Thomas M.; Gallois, B.

doi:10.1016/s0965-9773(98)00123-8

Cited by 332 publications

(141 citation statements)

References 16 publications

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“…7,8) The enhanced properties of nanocrystalline WC-Co based tool materials have been examined recently. [9][10][11] Therefore, the cryomilling process has attracted considerable attention for producing nano-sized WC powders.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cryomilling on Particle Size and Microstrain in a WC-Co Alloy

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Lee

Kang

2005

MATERIALS TRANSACTIONS

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The effects of temperature and milling time on the crystalline size and microstrain in WC and WC-Co powders were investigated in a cryomilling process. Within the limit of the analytical methods and TEM, the crystalline size of WC was estimated to be in the range of 50$70 nm after 10 h of cryomilling. The presence of Co in the WC-Co system significantly reduced the level of strain in the WC particles in this low-temperature processing. A thermal cycle employed in cryomilling process was also found to be useful in various aspects. Various fitting methods were compared and the results are discussed in relation to processing parameters.

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Section: Introductionmentioning

confidence: 99%

Effect of Cryomilling on Particle Size and Microstrain in a WC-Co Alloy

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Lee

Kang

2005

MATERIALS TRANSACTIONS

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“…This suggests an increase in lattice spacing, which can be attributed to differences in defect concentration and/or carbon stoichiometry between the two different WC crystallite sizes. 6) Therefore, an extensive XRD study was done with WC10Co-xVC-0.4C in order to examine the influence of VC in a WC-Co system.…”

Section: Xrd Analysismentioning

confidence: 99%

“…[2][3][4][5] Of the above issues, research directed at WC-Co prepared using nano sized WC particles has experienced some progress in recent years. Compared with a WC-Co system in which micron-sized WC is used, a higher degree of hardness can be achieved because of the nano grain size as well as by strengthening the binder itself by increasing the quantity of dissolved W. 6) In addition, the decrease in hardness as the result of an increase in binder content is less severe in a system where submicron-sized WC is used than in micron-sized ones. 7) Hardness can be further improved by the addition of various secondary carbides such as TiC, VC, TaC or Cr 3 C 2 .…”

Section: Introductionmentioning

confidence: 99%

Growth Inhibition of Nano WC particles in WC-Co Alloys during Liquid-Phase Sintering

Seo¹,

Kang²,

Lavernia³

2003

Mater. Trans.

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WC-10Co-xVC alloys were produced using two different sizes of WC powders (200 nm and 4.4 mm) via planetary milling and a liquidphase sintering technique. When VC was added to the WC-Co alloys, the growth of WC particles was effectively suppressed. However, this process was dependent on the amount of additive used. Since the average WC particle size became less than 1 mm, the system experienced a significant loss in carbon, resulting in the formation of an undesirable phase. The goal of this study was to determine the role of VC in controlling growth and to verify its effectiveness as a function of average WC size and inhibitor content. It was found from XRD and HREM studies that the (W,M)C phase was formed in WC-10Co-xVC-C systems. The effect of V or VC on the solubility of W in the Co matrix was also examined using HREM/EDS. The findings indicate that the presence of VC tends to reduce the solubility of W in a Co melt, thus inhibiting the dissolution and growth of WC.

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“…It is well known, that fine-grained alloys demonstrate better mechanical properties in comparison with coarser alloys of the same composition under the same terms [2][3][4]. Use of ultrafine or nanosized powders is one of the most efficient ways to produce new materials with required properties.…”

Section: Introductionmentioning

confidence: 99%