On Dispersion Strengthening of Zirconium Page: 4 of 10
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As a possible method of improving the elevated
temperature strength properties of zirconium, an in-
vestigation was initiated on the feasibility of producing
a dispersion-strengthened material. Because of the high
reactivity of zirconium, its high solubility for oxygen,
and the stability of the zirconium-oxygen solid solution,
the major problem in such a development is choice of a
suitable dispersant. That is, the dispersant must not
react with the matrix at temperatures required for fab-
rication or at temperatures encountered during service.
Thus, in the present investigation we were concerned
primarily with the stability of various dispersants in
the zirconium matrix.
The procedure employed in this study consisted
essentially of blending powders of zirconium and a dis-
persant, followed by cold compaction and extrusion.
The best available source of -325 mesh zirconium pow-
der contained between 1500 and 3500 ppm 02; to this
material, powders of zirconium carbide (5 max. ),
vanadium carbide (5p max. ), alumina (0. 03p average),
lanthana (0. 8-2 )., ceria,(0. 8-2p ), yttria (0. 8-2p ),
calcia (44 max.), or thoria (0. 6-0. 8 ) were added
in amounts of 7 vol% and compacted at 65 tsi. A cylin-
drical "green" compact having a density between 70 and
80 per cent of theoretical and dimensions of 1 inch di-
ameter by 1 1/4 inch high was thus produced. After
canning in copper, these billets.could be extruded (5:1)
on a 54-ton capacity, slow traverse hydraulic press with- 1 -
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Weinstein, D. & Holtz, F. C. On Dispersion Strengthening of Zirconium, report, January 1, 1962; Chicago, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc866101/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.