Dislocation-related plasticity of ceria-stabilized zirconia polycrystals

Journal Article · Sat Jun 01 00:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08796.x· OSTI ID:271689

Zhe, X; Hendry, A ^[1]; Wang, C ^[2]

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1. Univ. of Strathclyde, Glasgow (United Kingdom). Metallurgy and Engineering Materials Group
2. Lanzhou Univ. (China). Dept. of Materials Science

Much higher plastic strain of 4% in Ce-TZP ceramics was produced by a novel thermal-mechanical process below 450 C. Observation by TEM showed that there were abundant dislocation pile-ups associated with a few martensitic laths in the deformed samples. The density of dislocations increased with thermal-mechanical cycles. These suggested that dislocation multiplication was caused by the high local stress concentration in front of a martensitic lath during the thermal-mechanical deformation. The generation and movement of dislocations introduced extra plasticity beside the transformation plasticity caused by martensite. Meanwhile, movement of dislocations relaxes the interface stress at martensitic laths to prevent reverse martensitic transformation and early cracking of the specimens. The results are discussed in terms of thermal-mechanical action and dislocation multiplication.

• Sponsoring Organization: USDOE
• OSTI ID: 271689
• Journal Information: Journal of the American Ceramic Society, Vol. 79, Issue 6; Other Information: PBD: Jun 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ZIRCONIUM OXIDES
PLASTICITY
DISLOCATIONS
CERIUM OXIDES
POWDERS
COMPACTING
GRAIN SIZE
THERMOMECHANICAL TREATMENTS
CRYSTAL-PHASE TRANSFORMATIONS
TETRAGONAL LATTICES
MONOCLINIC LATTICES
MARTENSITE
STRESSES
STRAINS
TRANSMISSION ELECTRON MICROSCOPY
INTERFACES
CRACKS
X-RAY DIFFRACTION