FATIGUE-CRACK GROWTH OF SILICON-NITRIDE AT 1400-DEGREES-C - A NOVEL FATIGUE-INDUCED CRACK-TIP BRIDGING PHENOMENON

被引：32

作者：

LIU, SY

CHEN, IW

TIEN, TY

机构：

[1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1994年 / 77卷 / 01期

关键词：

D O I：

10.1111/j.1151-2916.1994.tb06967.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：

A high-strength Si3N4 with elongated-beta-Si3N4 and equiaxed alpha'-sialon was tested in cyclic and static fatigue at 1400-degrees-C. At low stress intensity factors and high frequencies, the pullout process of the elongated grains was enhanced, which suppressed the crack growth. This provides a possible explanation for the increased lifetime under cyclic loading conditions reported for ceramics by several investigators. While crack-healing by high-temperature annealing was found to greatly reduce the subsequent static fatigue crack growth rate, it had only a modest effect on cyclic fatigue and none at high frequencies.

引用

页码：137 / 142

页数：6

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