Metals and Ceramics Division Annual Progress Report for Period Ending June 30, 1967. Page: 15 of 300
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Summary
PART I. FUNDAMENTAL PROGRAMS
1. Crystal Physics
The internal centrifugal zone-growth (ICZG) tech-
nique we developed to grow crystals of UO2 was
improved. In the UO2-tungsten cermet, both rod
and lamellar eutectic structures resulted from the
unidirectional solidification inherent in ICZG tech-
nique. Molten-salt growth of 2-mm ThO2 single
crystals doped with 244Cm was accomplished;
electron-spin resonance and optical-spectra studies
are in progress. Hydrothermally, YOOH (up to 2
mm) was grown from LiOH solvent and doped with
various Ln3 + ions. Crystals of iron (7Li) ferrite
and other ferrites up to 1 cm in diameter and 8 cm
long were grown. Good-quality oriented crystals
resulted - as judged by neutron-rocking curve-line
widths of 0.30 and straight sharp neutron Laue dif-
fraction lines. We are able to measure the tem-
perature dependence of the magnetic susceptibility
and magnetization of small samples.
2. Deformation and Annealing of Metals
Inhomogeneities in the preferred orientation of
polycrystalline niobium were studied with regard
to amount of deformation and position in rolled
strip. The main components of the texture in the
center can be described as spread from {11111
K121) to (112} 110 ) at low reductions, centered
on (112} 110) at intermediate reductions, and
approximately 1113V 110) at reductions in thick-
ness of 99.5%. At higher amounts of deformation
there are further texture changes. A marked sur-
face texture occurs at deformations of 90 to 97%.
The study of effects of gold in solution and in
a precipitate on recrystallization and grain-boundary
mobility of zone-refined aluminum was concluded.3. Deformation of Crystalline Solids
Powerful analytical methods were developed for
transforming x-ray texture data into axial or bi-
axial pole figures, which are required for the com-
plete representation of fiber and sheet textures.
Least-squares methods are applicable for the
axial case, where one either solves for the coef-
ficients of a series or else solves directly for the
density function without recourse to a mathemati-
cal model. For the biaxial case, the same methods
become very difficult, and an iterative method was
much more satisfactory. The method was applied
to rolling textures for copper, brass, and aluminum.
Work is under way to establish the important
parameters that control the strengthening in alloys
exhibiting spinodal decomposition. Important
parameters are considered to be the wave length,
the degree of segregation, and the strains. Since
fracture behavior is important in determining the
mechanical properties, this is being investigated
also.
Very high deformation in copper and iron by
rolling changed both the internal structure and
the texture relative to more normal strains. Cross
rolling altered both the texture and the structure.
4. Diffusion in Solids
Self-diffusion coefficients were determined over
wide temperature ranges for the body-centered
cubic phase of titanium-vanadium alloys at 10%
increments in composition from pure titanium to
pure vanadium. Similar experiments were com-
pleted for self-diffusion in the body-centered
cubic and face-centered cubic phases of manganese.
The non-Gaussian penetration behavior at regions
near specimen surfaces was examined for s 8Co
and 60Co in silver and 63Ni and 60Co in gold;xiii
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Peterson, S. Metals and Ceramics Division Annual Progress Report for Period Ending June 30, 1967., report, January 1, 1967; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1030019/m1/15/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.