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Competitive growth of Al 2 O 3 / YAG /ZrO 2 eutectic ceramics during directional solidification: Effect of interfacial energy
Author(s) -
Wang Xu,
Zhong Yujie,
Sun Qian,
Qi Dongqing,
Yan Fuxue,
Xian Quangang,
Wang Dong,
Du Kui,
Wang Jingyang
Publication year - 2019
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.16057
Subject(s) - eutectic system , materials science , microstructure , directional solidification , ceramic , ternary operation , crystallography , cubic zirconia , mineralogy , composite material , chemistry , computer science , programming language
The microstructure evolution and growth behavior of the Al 2 O 3 /Y 3 Al 5 O 12 ( YAG )/ZrO 2 ternary eutectic ceramics during directional solidification were well investigated. During directional solidification of the Al 2 O 3 / YAG /ZrO 2 ternary eutectic ceramics, { 11 2 ¯ 0 } Al 2 O 3 paralleled with {001}ZrO 2 while they did not parallel with {001} YAG at the same time in the competitive growth stage. All of the interfaces parallel to each other finally. The area percentage of the Al 2 O 3 /ZrO 2 and YAG /ZrO 2 interfaces are 40.4 ± 0.2% and 30.8 ± 0.1%, respectively, higher than that of the Al 2 O 3 / YAG (28.8 ± 0.2%). The content of Al 2 O 3 and YAG phases are 39.9% and 41.1%, respectively, almost double of that of ZrO 2 . The interfaces of Al 2 O 3 /ZrO 2 and YAG /ZrO 2 are shorter and more dispersed than that of the Al 2 O 3 / YAG . It was found that the interfacial energy of Al 2 O 3 /ZrO 2 and YAG /ZrO 2 interfaces are lower than that of Al 2 O 3 / YAG . It can be concluded that interfacial energy plays a decisive role in affecting the crystallographic orientation and interfaces distribution in the Al 2 O 3 / YAG /ZrO 2 eutectic since the interfaces of Al 2 O 3 /ZrO 2 and YAG /ZrO 2 with lower interfacial energy can be formed more easily during directional solidification. Therefore, the contents of Al 2 O 3 /ZrO 2 and YAG /ZrO 2 interfaces are higher. This study can provide theoretical guidance for interface design of multi‐phase materials.