Grain and phase boundary segregation in WC–Co with small V, Cr or Mn additions / Jonathan Weidow in Acta materialia, Vol. 58 N° 11 (Juin 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3888–3894 Titre : Grain and phase boundary segregation in WC–Co with small V, Cr or Mn additions Type de document : texte imprimé Auteurs : Jonathan Weidow, Auteur ; Hans-Olof Andrén, Auteur Année de publication : 2011 Article en page(s) : pp. 3888–3894 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Grain boundary segregation Phase Atom probe tomography Transmission electron microscopy Energy-dispersive X-ray analysis Résumé : The effect of small additions of V, Cr or Mn on the microchemistry of interfaces in WC–Co was studied using energy-dispersive X-ray spectroscopy in a transmission electron microscope and using atom probe tomography. For WC/binder phase boundaries, segregation of V, Cr and Mn was observed, with V being the element with the largest tendency for segregation. Segregation to WC/WC grain boundaries was observed in all the materials, corresponding to half a monolayer of close packed Co. In the materials containing V or Cr, 1/3 of the Co atoms were replaced by V or Cr. In the material containing Mn, 7% of the Co atoms were replaced by Mn. Co segregation was also observed to a WC/(V, W)Cx phase boundary in the material containing V. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000193X [article] Grain and phase boundary segregation in WC–Co with small V, Cr or Mn additions [texte imprimé] / Jonathan Weidow, Auteur ; Hans-Olof Andrén, Auteur . - 2011 . - pp. 3888–3894. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3888–3894 Mots-clés : Grain boundary segregation Phase Atom probe tomography Transmission electron microscopy Energy-dispersive X-ray analysis Résumé : The effect of small additions of V, Cr or Mn on the microchemistry of interfaces in WC–Co was studied using energy-dispersive X-ray spectroscopy in a transmission electron microscope and using atom probe tomography. For WC/binder phase boundaries, segregation of V, Cr and Mn was observed, with V being the element with the largest tendency for segregation. Segregation to WC/WC grain boundaries was observed in all the materials, corresponding to half a monolayer of close packed Co. In the materials containing V or Cr, 1/3 of the Co atoms were replaced by V or Cr. In the material containing Mn, 7% of the Co atoms were replaced by Mn. Co segregation was also observed to a WC/(V, W)Cx phase boundary in the material containing V. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000193X

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