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Tensile Ductility in Zirconia‐Dispersed Alumina at High Temperatures
Author(s) -
Okada Kazuki,
Sakuma Taketo
Publication year - 1996
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.1151-2916.1996.tb08152.x
Subject(s) - materials science , ductility (earth science) , ultimate tensile strength , elongation , flow stress , grain boundary , grain boundary sliding , cubic zirconia , composite material , dispersion (optics) , phase (matter) , grain growth , metallurgy , grain size , microstructure , chemistry , creep , ceramic , physics , optics , organic chemistry
High‐temperature plastic flow in Al 2 O 3 ‐10 wt% ZrO 2 (2.5 mol% Y 2 O 3 ) has been examined at temperatures between 1400° and 1500°C. Al 2 O 3 ‐10 wt% ZrO 2 (2.5 mol% Y 2 O 3 ) exhibits much higher flow stress and smaller tensile elongation below about 1450°C than 0.1 wt% MgO‐doped single‐phase Al 2 O 3 . The suppression of grain growth with ZrO 2 dispersion into Al 2 O 3 is not effective for improving the tensile ductility. The limited ductility in Al 2 O 3 ‐10 wt% ZrO 2 (2.5 mol% Y 2 O 3 ) is associated with the increment of flow stress caused by ZrO 2 . The ZrO 2 dispersion or segregation in Al 2 O 3 /Al 2 O 3 boundaries suppresses the grain boundary sliding and hence results in the increased flow stress at high temperatures.