Elastic behavior of single crystals of ytrria-stabilized zirconia

Technical Report · Thu Sep 01 04:00:00 EDT 1983

OSTI ID:5277411

Kandil, H M

Single-crystalline elastic constants of yttria-stabilized zirconia (YSZ) have been determined at 20 to 700/sup 0/C by the pulse-echo-overlap technique. 8.1, 11.1, 12.1, 15.5, and 17.9 mol % Y/sub 2/O/sub 3/ were examined. With increasing Y/sub 2/O/sub 3/ content, C/sub 11/ decreases, whereas C/sub 12/ and C/sub 44/ increase. The high Debye temperatures of the YSZ crystals are characteristic of the strong interatomic interactions. In a harmonic approximation, with neglect of any change in force constants, the Debye temperatures of YSZ crystals should be inversely proportional to the square root of the vibrating masses in the lattice. Such proportionality was found valid for the five YSZ crystals of this investigation. All conventional constants show normal negative temperature dependencies except those of the 8.1 mol % Y/sub 2/O/sub 3/ alloy. Shear anisotropy in YSZ is pronounced and it decreases with increasing Y/sub 2/O/sub 3/ content but increases with temperature. Extrapolation of longitudinal and shear constants along different crystallographic directions at room temperature indictes elastic isotropy near 40 mol % Y/sub 2/O/sub 3/ where a number of investigations have established the presence of an ordered phase (Zr/sub 3/Y/sub 4/O/sub 12/) with a rhombohedral symmetry.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5277411
• Report Number(s): IS-T-1087; ON: DE84007365
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ANISOTROPY
CHALCOGENIDES
CRYSTALS
DEBYE TEMPERATURE
ELASTICITY
MECHANICAL PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES