In situ martensitic transformation in a ternary MgO-Y/sub 2/O/sub 3/-ZrO/sub 2/ alloy: I, transformation in tetragonal ZrO/sub 2/ grains

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1988.tb06390.x· OSTI ID:6265763

Lee, R R; Heuer, A H

The martensitic transformation in tetragonal ZrO/sub 2/ grains in a ternary MgO-Y/sub 2/O/sub 3/-ZrO/sub 2/ alloy has been studied using in situ observations in the transmission electron microscope. Transformation occurred by the nucleation and growth of monoclinic laths; thermoelastic equilibrium can be maintained at different extents of transformation by continuously varying the applied stress. The product phase was always twinned, but two twinning mechanisms were found - sequential formation of twin-related variants and posttransformation deformation twinning. In one example, a (401)/(410) pair of martensite habit planes led to a (100) conjunction twinning plane.

• Research Organization: Dept. of Materials Science and Engineering, Case Western Reserve Univ., Cleveland, OH (US); CPS, Inc., Cambridge, MA (US)
• OSTI ID: 6265763
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 71:8; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
CARBON ADDITIONS
CHALCOGENIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEFORMATION
ELASTICITY
ELECTRON MICROSCOPY
GRAIN ORIENTATION
GRAIN SIZE
IRON ALLOYS
MARTENSITE
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SIZE
TENSILE PROPERTIES
TERNARY ALLOY SYSTEMS
TETRAGONAL LATTICES
THERMOELASTICITY
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES