Hafnium I. Microstructure

The dislocation density of hafnium was reduced from 10 9 to 10 7 cm −2 by multiple electron beam melting. A decrease in oxygen content from 0.210 to 0.030% was achieved by three electron beam melting passes. The unpinned dislocation velocity was found to increase from 2.5 × 10 −5 to 6 × 10 −3 cm sec...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the less-common metals 1969-01, Vol.19 (2), p.83-92
Main Author: Vahldiek, F.W.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The dislocation density of hafnium was reduced from 10 9 to 10 7 cm −2 by multiple electron beam melting. A decrease in oxygen content from 0.210 to 0.030% was achieved by three electron beam melting passes. The unpinned dislocation velocity was found to increase from 2.5 × 10 −5 to 6 × 10 −3 cm sec −1 with increasing temperature (80 °–600 °C). Electron and X-ray diffraction studies showed only the alpha hexagonal phase of hafnium present in the specimens. Thermal stresses in hafnium produced prismatic slip of the {101̄0} 〈112̄0〉 type. Mechanical twins of the {101̄2} 〈101̄1〉 type were also found in thin films of hafnium. Stacking faults were observed in the as-received, oxygen-rich hafnium samples.
ISSN:0022-5088
DOI:10.1016/0022-5088(69)90023-X