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In Situ Martensitic Transformation in a Ternary MgO‐Y 2 O 3 ‐ZrO 2 Alloy: I, Transformation in Tetragonal ZrO 2 Grains
Author(s) -
LEE RANRONG,
HEUER ARTHUR H.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb06390.x
Subject(s) - crystal twinning , materials science , tetragonal crystal system , nucleation , crystallography , diffusionless transformation , monoclinic crystal system , alloy , transmission electron microscopy , phase (matter) , martensite , metallurgy , microstructure , thermodynamics , crystal structure , chemistry , nanotechnology , physics , organic chemistry
The martensitic transformation in tetragonal ZrO 2 grains in a ternary MgO‐Y 2 O 3 ‐ZrO 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.