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Relationship between Transformation Temperature and Time‐Temperature‐Transformation Curves of Tetragonal‐to‐Monoclinic Martensitic Transformation in Zirconia‐Yttria System
Author(s) -
Tsubakino Harushige,
Matsuura Natsuki
Publication year - 2002
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.1151-2916.2002.tb00411.x
Subject(s) - monoclinic crystal system , materials science , diffusionless transformation , tetragonal crystal system , isothermal process , nucleation , isothermal transformation diagram , thermodynamics , phase (matter) , transformation (genetics) , cubic zirconia , crystallography , metallurgy , martensite , chemistry , microstructure , crystal structure , bainite , ceramic , physics , biochemistry , organic chemistry , gene
The tetragonal → monoclinic ( t → m ) martensitic phase transformation in ZrO 2 –0.5–4 mol% Y 2 O 3 proceeds during isothermal aging at various temperatures from 350 to 800 K; i.e., the transformation increases sigmoidally with aging time. The time‐temperature‐transformation ( T ‐ T ‐ T ) curves show a typical C shape, with very high rate for lower Y 2 O 3 ‐content specimens, and the rate decreases with higher Y 2 O 3 content. The transformation temperature ( M s ) of the t → m transformation obtained from dilatation curves during the cooling stage coincides well with C curves above the nose temperature. The t → m transformation should occur isothermally, as suggested by a nucleation and growth mode.