In situ transmission electron microscopy observations of the monoclinic to tetragonal phase transformation in tetragonal ZrO sub 2

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Acta Metallurgica; (USA)

DOI:https://doi.org/10.1016/0001-6160(89)90070-9· OSTI ID:6815893

Mecartney, M L; Ruhle, M ^[1]

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1. Max-Plank-Institut fur Metallforschung, Institut fur Werkstoffwissenschaft, Seestrasse 92, 7000 Stuttgart 1 (DE)

This paper reports the tetragonal to monoclinic (t {r arrow} m) transformation and the reverse transformation (m {r arrow} t) in Y{sub 2}O{sub 3} doped ZrO{sub 2} were studied using transmission electron microscopy (TEM). Transformation to the monoclinic phase nucleated at grain boundaries in the tetragonal material and this phase slowly and stably grew. Under a high intensity electron beam the transformation was observed to reverse for certain grains which were only partially transformed and not twinned. Beam heating is suggested as the primary cause for this effect, with compressive stresses from the volume expansion of transformation playing a minor role. After the reverse transformation from m {r arrow} t ZrO{sub 2} was complete, grains retained no memory of the previous monoclinic nucleation sites for the next t {r arrow} m cycle.

• OSTI ID: 6815893
• Journal Information: Acta Metallurgica; (USA), Journal Name: Acta Metallurgica; (USA) Vol. 37:7; ISSN 0001-6160; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
CRYSTAL DOPING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
MICROSCOPY
MICROSTRUCTURE
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES