MICROCRACKING AND R-CURVE BEHAVIOR IN SIC-TIB2 COMPOSITES

被引：42

作者：

GU, WH ^{[1
]}

FABER, KT ^{[1
]}

STEINBRECH, RW ^{[1
]}

机构：

[1] RES CTR JULICH, INST REACTOR MAT, JULICH, GERMANY

来源：

ACTA METALLURGICA ET MATERIALIA | 1992年 / 40卷 / 11期

关键词：

D O I：

10.1016/0956-7151(92)90475-T

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fracture toughness of SiC-TiB2 composites is studied as a function of TiB2 size and fraction with emphasis on the effect of stress-induced microcracking. R-curve behavior in these materials is observed from double cantilever beam tests and is found to be a major strength-controlling factor. The microcrack process zones are confirmed by both small angle X-ray scattering and transmission electron microscopy. The process zone size scales with the fraction of TiB2 present. For composites containing fine TiB2 particles, quasi-catastrophic crack growth and arrest are observed during R-curve measurements. The various contributions to the R-curve are discussed.

引用

页码：3121 / 3128

页数：8

共 24 条

[1]

BABILON E, 1989, PAM EURO CERAMICS, P3247

[2] COMPUTER-SIMULATIONS OF R-CURVE BEHAVIOR IN MICROCRACKING MATERIALS [J].