Abstract
The microstructure formation of Al2O3-HfO2 eutectic prepared by unidirectional solidification and rapid solidification was examined. The microstructure of the Al2O3-HfO2 eutectic samples showed lamellar structure and the relationship between the inter-lamellar spacing λ and solidification rate R can be expressed by λ2R=constant. A small amount of tetragonal HfO2 phase exists in the sample prepared by rapid solidification. Only monoclinic HfO2 phase can be found in the eutectic samples prepared by unidirectional solidification. A tensile stress was induced in Al2O3 phase during the cooling step due to the transformation of HfO2 from tetragonal to monoclinic phase. The tensile stress of the Al2O3 phase in the eutectic structure was estimated to 420 MPa.
| Original language | English |
|---|---|
| Pages (from-to) | 433-436 |
| Number of pages | 4 |
| Journal | Journal of the Ceramic Society of Japan |
| Volume | 123 |
| Issue number | 1437 |
| DOIs | |
| Publication status | Published - Jan 1 2015 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry
Cite this
Microstructure formation of Al2O3-HfO2 eutectic. / Seya, Kyosuke; Jang, Byung Koog; Ueno, Shunkichi.
In: Journal of the Ceramic Society of Japan, Vol. 123, No. 1437, 01.01.2015, p. 433-436.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microstructure formation of Al2O3-HfO2 eutectic
AU - Seya, Kyosuke
AU - Jang, Byung Koog
AU - Ueno, Shunkichi
PY - 2015/1/1
Y1 - 2015/1/1
N2 - The microstructure formation of Al2O3-HfO2 eutectic prepared by unidirectional solidification and rapid solidification was examined. The microstructure of the Al2O3-HfO2 eutectic samples showed lamellar structure and the relationship between the inter-lamellar spacing λ and solidification rate R can be expressed by λ2R=constant. A small amount of tetragonal HfO2 phase exists in the sample prepared by rapid solidification. Only monoclinic HfO2 phase can be found in the eutectic samples prepared by unidirectional solidification. A tensile stress was induced in Al2O3 phase during the cooling step due to the transformation of HfO2 from tetragonal to monoclinic phase. The tensile stress of the Al2O3 phase in the eutectic structure was estimated to 420 MPa.
AB - The microstructure formation of Al2O3-HfO2 eutectic prepared by unidirectional solidification and rapid solidification was examined. The microstructure of the Al2O3-HfO2 eutectic samples showed lamellar structure and the relationship between the inter-lamellar spacing λ and solidification rate R can be expressed by λ2R=constant. A small amount of tetragonal HfO2 phase exists in the sample prepared by rapid solidification. Only monoclinic HfO2 phase can be found in the eutectic samples prepared by unidirectional solidification. A tensile stress was induced in Al2O3 phase during the cooling step due to the transformation of HfO2 from tetragonal to monoclinic phase. The tensile stress of the Al2O3 phase in the eutectic structure was estimated to 420 MPa.
UR - http://www.scopus.com/inward/record.url?scp=84928883420&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84928883420&partnerID=8YFLogxK
U2 - 10.2109/jcersj2.123.433
DO - 10.2109/jcersj2.123.433
M3 - Article
AN - SCOPUS:84928883420
VL - 123
SP - 433
EP - 436
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 1882-0743
IS - 1437
ER -