High entropy alloys (HEAs) as a binder material for heavy tungsten alloys, tungsten carbide hardmetals, and titanium carbo-nitride based cermet composites - a comprehensive review

Katiyar, Prvan Kumar; Lavakumar, Avala; Maurya, Rita; Singh, Prince Kumar

doi:10.1080/2374068x.2022.2142397

Cited by 2 publications

(3 citation statements)

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“…The WC-HEA also showed, especially between RT and 500 • C, higher hardness values, followed by WC-Co and WC-FeNiMn. This suggests that the HEA binder has visibly better hardness properties up to 500 • C. Explanations for this could of course be the high disorder and stability of alloy partners or because of a slightly smaller average WC grain size as compared to the WC-Co reference material [28]. WC-FeNiCo also showed a slightly smaller average WC grain size as compared to WC-Co, and showed lower hot hardness values over the whole temperature range.…”

Section: Discussionmentioning

confidence: 98%

“…This suggests that the HEA binder has visibly better hardness properties up to 500 °C. Explanations for this could of course be the high disorder and stability of alloy partners or because of a slightly smaller average WC grain size as compared to the WC-Co reference material [28]. WC-FeNiCo also showed a slightly smaller average WC grain size as…”

Section: Discussionmentioning

confidence: 99%

“…Thus, currently more and more research is focused on adjusted Ni-and Fe-based alloys with small additions of other metal elements [21][22][23][24][25]. Furthermore, high-entropy alloys (HEA) have gained interest in recent years, although Co is often still used as an alloying partner [26][27][28][29][30]. Even if some research has already demonstrated the high potential of Fe-or Ni-based and HEA binders, one of the main problems is the reduced carbon window and the formation of unwanted phases [26,31].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Alternative Hard and Binder Phase Compositions in Hardmetals on Thermophysical and Mechanical Properties

Hering,

Gestrich,

Steinborn

et al. 2023

Metals

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Due to the classification of Co as a CMR (carcinogenic, mutagenic, toxic to reproduction) as well as the classification of both Co and WC as CRM (critical raw materials) more and more research is being carried out to investigate possible substitutes for WC-Co hardmetals. To directly compare their microstructure as well as mechanical and thermophysical properties, five very different hardmetals were investigated. For this purpose, the compositions WC-Co, WC-FeNiMn, WC-HEA, NbC-Co and HEC-Co were selected in order to investigate alternative binders for cobalt as well as different alternative hard phases for WC. The results of the hardness measurements showed that for the hardmetals with alternative binders (WC-FeNiMn and WC-HEA) hardness values of 1327 HV10 and 1299 HV10 comparable to WC-Co with 1323 HV10 can be achieved. When WC is replaced by HEC as the hard phase, a significantly higher hardness of 1543 HV10 can be obtained, demonstrating the great potential of high-entropy carbides. Furthermore, the hot hardness measurements between RT and 900 °C showed significantly higher values (up to approx. 290 HV10) for the WC-HEA and HEC-Co hardmetals compared to those of WC-Co. However, the fracture toughness of the alternative hardmetals was lower compared to that of conventional WC-Co hardmetals. In terms of thermophysical properties, the results of the hardmetals with alternative binders were close to those of WC-Co. Thus, it can be shown that it is possible to produce alternative hardmetals with comparable properties to WC-Co and that with further optimization they show great potential to replace WC-Co in the near future.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%