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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 ,
Mao Changhui ,
Du Jun ,
Michel Daniel ,
Champion Yannick ,
Hagège Serge  and
Hÿtch Martin
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.

Keywords

structural propertiesmechanical millingWC-Co
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 634: Symposium B – Structure and Mechanical Properties of Nanophase Materials-Theory & Computer Simulations vs. Experiment , 2000 , B8.7.1
Copyright
Copyright © Materials Research Society 2001

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References

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