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Processing‐Dependent Microstructural Factors Affecting Cavitation Damage and Tensile Ductility in a Superplastic Alumina Dispersed with Zirconia
Author(s) -
Hiraga Keijiro,
Nakano Keishi,
Suzuki Tohru S.,
Sakka Yoshio
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.tb00526.x
Subject(s) - superplasticity , materials science , cavitation , ductility (earth science) , grain size , ultimate tensile strength , composite material , cubic zirconia , metallurgy , microstructure , ceramic , creep , physics , mechanics
Superplastic tensile ductility in Al 2 O 3 –10 vol% ZrO 2 (3 mol% Y 2 O 3 ) exhibits processing dependence when the grain size is reduced to 0.45 μm for a given relative density of ∼99.5%. The reduced grain size leads to largely enhanced ductility in a material prepared by colloidal processing, but does not in a material prepared by conventional dry processing. This result is explained from cavity‐damage accumulation sensitive to a rather small variation in a few processing‐dependent factors: the numerical densities of residual defects and ZrO 2 particles. The rate of damage accumulation is shown to depend mainly on the former and additionally on the latter.