Grain and phase boundary segregation in WC-Co with TiC, ZrC, NbC or TaC additions
Artikel i vetenskaplig tidskrift, 2011

The microstructure of interfaces in WC-Co based cemented carbides with TiC, ZrC, NbC or TaC additions was analysed using energy dispersive X-ray analysis in a transmission electron microscope and using atom probe tomography. Segregation to WC/WC grain boundaries and WC/(M,W)C phase boundaries corresponding to between 0.4 and 1.2 atomic layers of close packed monolayers of Co was observed in all the materials. In addition to Co, Ti, Zr and Nb, but not Ta, segregate to the WC/WC grain boundaries. Segregation was also observed for B, P, Fe and Cr, but not Ni, to the boundaries. These are impurities that originate from the material production. Segregation of Ti, Zr, Nb and Ta to WC/binder phase boundaries was observed. If formation of a MC phase at the interface is assumed, the segregation corresponded to a thickness less than a monolayer. © 2010 Elsevier Ltd. All rights reserved.

Författare

Jonathan Weidow

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Hans-Olof Andrén

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

International Journal of Refractory Metals and Hard Materials

0263-4368 (ISSN)

Vol. 29 1 38-43

Ämneskategorier

Materialteknik

Bearbetnings-, yt- och fogningsteknik

Styrkeområden

Materialvetenskap

DOI

10.1016/j.ijrmhm.2010.06.010