MICROSTRUCTURE OF PRESSURELESS-SINTERED AL2O3-24 VOL-PERCENT ZRO2 COMPOSITE STUDIED BY HIGH-RESOLUTION ELECTRON-MICROSCOPY

被引：17
|
作者：
LEE, BT
HIRAGA, K
SHINDO, D
NISHIYAMA, A
机构：
[1] TOHOKU UNIV,INST ADV MAT PROC,SENDAI,MIYAGI 980,JAPAN
[2] MITSUBISHI MAT CO,CENT RES INST,SAITAMA 330,JAPAN
来源：
JOURNAL OF MATERIALS SCIENCE | 1994年 / 29卷 / 04期
关键词：
D O I：
10.1007/BF00351417
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure of an Al2O3-24 vol % ZrO2 composite prepared by pressureless-sintering was investigated by high-resolution electron microscopy. The composite was formed of homogeneously dispersed ZrO2 and Al2O3 grains with average sizes of 0.3 and 0.5 mum, respectively. Most ZrO2 grains had a monoclinic structure, but a few ZrO2 embedded in Al2O3 grains were a tetragonal structure. At interfaces between ZrO2 with a lamella-type twin structure and Al2O3, microcracks were observed, in addition to strain fields in the Al2O3 matrix. Complex twin structures accompanied by dislocations were observed in ZrO2 with a spherical shape. In in situ observations with electron-beam heating, it was found that a crack propagated along an Al2O3/ZrO2 interface and stopped at the place where a tetragonal ZrO2 had undergone a structural change to monoclinic ZrO2.
引用
收藏
页码：959 / 964
页数：6
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