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Microstructural effect on corrosion of tungsten in SF6 environment

Published online by Cambridge University Press:  10 January 2013

W. Wong-Ng ,
C. S. Choi  and
L. P. Cook
W. Wong-Ng
Affiliation:
Materials Engineering and Science Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
C. S. Choi
Affiliation:
Materials Engineering and Science Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
L. P. Cook
Affiliation:
Materials Engineering and Science Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

Reaction of tungsten (W) with SF6 has been studied using two types of samples. The first type (type I) consisted of rods fabricated by a drawing process and the second type (type II) consisted of square plates cut from a hot pressed billet. After the corrosion experiments, scanning electron microscopy (SEM) examination of the type I sample indicated the presence of deep pits parallel to the rod axis. X-ray analysis of these rods showed preferred orientation. Pole figure measurement was subsequently conducted to quantify the preferred orientation by using neutron diffraction. A significant orientation effect on the corrosion process was found, possibly originating from the considerable granular elongation parallel with the rod axis produced during the fabrication process. In contrast, the type II sample showed no directional corrosion and insignificant preferred orientation.

Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 1 , March 1995 , pp. 8 - 12
Copyright
Copyright © Cambridge University Press 1995

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References

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