CREEP OF DUPLEX MICROSTRUCTURES

被引：177

作者：

FRENCH, JD ^{[1
]}

ZHAO, JH ^{[1
]}

HARMER, MP ^{[1
]}

CHAN, HM ^{[1
]}

MILLER, GA ^{[1
]}

机构：

[1] LEHIGH UNIV,DEPT MAT SCI & ENGN,BETHLEHEM,PA 18015

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1994年 / 77卷 / 11期

关键词：

D O I：

10.1111/j.1151-2916.1994.tb04515.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The tensile creep behavior of two ceramic composite systems exhibiting duplex microstructures was studied relative to their single-phase constituents in the temperature and stress ranges of 1100-1350 degrees C and 35-75 MPa. The equivolumetric compositions in the Al2O3:c-ZrO2 (8 mol% Y2O3) and Al2O3:Y3Al5O12 systems both exhibit lower creep rates than either of their single-phase constituents. This effect is attributed to Y3+ (and possibly Zr4+) present in the Al2O3 as a segregant which lowers the creep rate by similar to 2 orders of magnitude. It is believed that the segregation of Y3+ to the Al2O3 grain boundaries hinders the interface reaction believed to control the creep. If one of the single-phase constituents is taken to be the Y3+-doped Al2O3, the creep of the duplex microstructures can be modeled using standard composite theory applied to flow.

引用

页码：2857 / 2865

页数：9

共 34 条

[1] DIFFUSION-ACCOMMODATED FLOW AND SUPERPLASTICITY [J].