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Effect of interfacial energy on microstructure of a directionally solidified Al 2 O 3 /YAG eutectic ceramic
Author(s) -
Wang Xu,
Zhong Yujie,
Wang Dong,
Sun Luchao,
Jiang Bailing,
Wang Jingyang
Publication year - 2018
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/jace.15317
Subject(s) - eutectic system , microstructure , materials science , ceramic , transmission electron microscopy , sapphire , scanning electron microscope , directional solidification , crystallography , composite material , analytical chemistry (journal) , optics , nanotechnology , chemistry , physics , laser , chromatography
An Al 2 O 3 /Y 3 Al 5 O 12 eutectic ceramic was prepared with a c ‐axis sapphire seed by an optical floating zone furnace. The crystallographic relationships in the initial and the steady growth sections of the as‐grown eutectic ceramic were investigated by electron backscattering diffraction and transmission electron microscopy. The corresponding results were: <111 > {101}Y 3 Al 5 O 12 || <0001 > { 11 2 ¯ 0 }Al 2 O 3 and <110 > { 2 1 ¯ 1 }Y 3 Al 5 O 12 || < 1 1 ¯ 00 > {0001}Al 2 O 3 , respectively. The steady orientation of the latter one shows smaller planar disregistry. Interfacial strain played the decisive role in affecting the solidification behavior of the Al 2 O 3 /Y 3 Al 5 O 12 eutectic ceramic. The stability of interfaces with minimum interfacial strain and better ionic charge balance in irregular microstructure prevail upon the constraint of the seed. These results might cast light for the interfacial design of the Al 2 O 3 /Y 3 Al 5 O 12 binary eutectic ceramic.