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Stacking Faults Created by Mechanical Milling in Nanostructured WC-Co Composite Powder

Published online by Cambridge University Press:  14 March 2011

Yang Zhimin
Affiliation:
General Research Institute for Non-ferrous Metals, Beijing 100088, P. R. China
Mao Changhui
Affiliation:
General Research Institute for Non-ferrous Metals, Beijing 100088, P. R. China
Du Jun
Affiliation:
General Research Institute for Non-ferrous Metals, Beijing 100088, P. R. China
Michel Daniel
Affiliation:
Centre d'Etudes de Chimie Métallurgique / CNRS, 94407 Vitry-sur-Seine, France
Champion Yannick
Affiliation:
Centre d'Etudes de Chimie Métallurgique / CNRS, 94407 Vitry-sur-Seine, France
Hagège Serge
Affiliation:
Centre d'Etudes de Chimie Métallurgique / CNRS, 94407 Vitry-sur-Seine, France
Hÿtch Martin
Affiliation:
Centre d'Etudes de Chimie Métallurgique / CNRS, 94407 Vitry-sur-Seine, France
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Abstract

Nanostructured WC-Co powders obtained by mechanical milling were investigated by combination of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) techniques. HRTEM image analysis shows that in the as-milled nanostructured powder, many WC grains contain stacking faults lying on the plane{10.0}. Analysis of phase images showed that these defects were nearly periodically ordered along the [10.0] direction. Based on these observations, a structural model is proposed for the WC grains with ordered stacking faults, which is in fact equivalent to a superstructure of WC with space group Amm2. When this model is introduced together with the normal WC structure (space group P6m2) into the Rietveld refinement, a much better agreement between the calculated and experimental XRD profiles is obtained. This study allowed obtaining the lattice parameters, grain size, microstrain and other structural information on the as-milled powders.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1 Suryanarayana, C, International Materials Reviews, 40, 41(1995).Google Scholar
2 Mao C, H, Du, J, Champion, Y, Hagège, S, Michel, D, 6th Conf and Exhib of the Eur. Ceram. Soc, British Ceramic Proceedings n°60, vol. 1, 399(1999).Google Scholar
3 Langford J, I, Accuracy in Powder Diffraction II, NIST Special Publication N° 846, ed. Prince, E. & Stalick, K.A., Gaithersburg, MA (1992), 110.Google Scholar
4 Ungar, T., Borbèly, A., Goren-Muginstein, G. R., Berger, S. and Rosen, A.R., Nanostructured Materials, 11, 103(1999).Google Scholar
5 Langford, J.I; Louër, D and Scardi, P, J. Appl. Cryst. 33, 964(2000).Google Scholar
6 Rodriguez-Carvajal, J., Reference Guide for the Computer Program Fullprof, Laboratoire Lèon Brillouin, CEA-CNRS, Saclay (France)Google Scholar
7 Hagège, S, PhD Thesis, University of Caen, 1980.Google Scholar
8 Hÿtch, M J, Potez, L, Phil. Mag. A76, 1119(1997).Google Scholar