Single-crystal elastic constants of. gamma. -cerium

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(80)90372-5· OSTI ID:6742922

Greiner, J D; McMasters, O D; Smith, J F

To verify the shear anisotropy of cerium, a determination of the single-crystal elastic constants was undertaken with the ultrasonic pulse-echo-overlap technique at a frequency of 10 MHz. A single crystal was grown by the Czochralski technique. The three independent ultrasonic velocities were measured along this off-symmetry direction, and the elastic constants were derived from the measured velocities by the perturbation method of Neighbours and Smith. A second lapping and etching of the crystal faces brought the normal direction to 3.5/sup 0/ from the (110) direction and the measurements were repeated. They indicate a shear anisotropy of 2 C/sub 44//(C/sub 11/-C/sub 12/) = 2.94 in close accord with the extrapolation of Stassis et al. The bulk modulus, kappa = (C/sub 11/+2C/sub 12/)/3, is indicated by these single crystal data to be 18.18 GPa and is somewhat smaller than values of 21.2-21.5 GPa reported by Rosen and of 19.8 GPa reported by Smith et al., both derived from ultrasonic velocity measurements with polycrystalline specimens.

• Research Organization: Iowa State Univ., Ames
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6742922
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 14:9; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ANISOTROPY
CERIUM
CERIUM-GAMMA
CRYSTALS
ELASTICITY
ELEMENTS
MECHANICAL PROPERTIES
METALS
MONOCRYSTALS
RARE EARTHS
SHEAR
TENSILE PROPERTIES