Microstructure and micro-mechanical properties of Y-TZP and Y-TZP/Al2O3 composite after superplastic deformation

被引：13

作者：

Shi, JL ^{[1
]}

Lu, ZL ^{[1
]}

Gao, JH ^{[1
]}

Zhu, GQ ^{[1
]}

Li, L ^{[1
]}

Lai, TR ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

来源：

ACTA MATERIALIA | 1998年 / 46卷 / 06期

关键词：

D O I：

10.1016/S1359-6454(97)00424-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure and micro-mechanical properties of superplastically deformed Y-TZP ceramics and Y-TZP/Al2O3 composites were investigated. The grain growth on average of the pure Y-TZP ceramics during deformation at the temperature 100 degrees C below the sintering temperature was very limited, while extensive growth of Y-TZP grains in Y-TZP/alumina composites were found under the same condition. The segregation of Y3+ in single phase Y-TZP and the glass phase present at triple points in the composites was believed to be responsible for the different grain growth behavior. The change of mechanical properties of the materials were found to mainly relate to the microstructural change of the materials during deformation. In the case of single phase Y-TZP ceramics, both Vicker's hardness and indentation toughness do not apparently change by deformation, but the indentation toughness of the Y-TZP/alumina composites decreased noticeably due to the extensive grain growth of Y-TZP and thereafter the occurrence of monoclinic zirconia phase. (C) 1998 Acta Metallurgica Inc.

引用

页码：1923 / 1932

页数：10

共 13 条

[1] IMPURITY AND YTTRIUM SEGREGATION IN YTTRIA-TETRAGONAL ZIRCONIA [J].