Quantitative evaluation by fractal analysis of indentation crack paths in Si3N4-SiCW composites

被引：11

作者：

Celli, A ^{[1
]}

Tucci, A ^{[1
]}

Esposito, L ^{[1
]}

机构：

[1] Italian Ceram Ctr, I-40138 Bologna, Italy

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1999年 / 19卷 / 04期

关键词：

Si3N4; SiC; whiskers; fractal analysis; toughness and toughening;

D O I：

10.1016/S0955-2219(98)00214-3

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 crack paths, generated by Vickers indentation in Si3N4-SiCw composites, were analysed from a quantitative point of view, in order to distinguish between the possible toughening mechanisms involved. It was found that the roughness parameter R-L and the fractal dimension D describe the geometrical features of the cracks and evidence the anisotropy of the microstructure, due to the whisker and Si(3)N(4)beta-grain orientation. The relationships found between fracture toughness and these geometrical parameters emphasise the importance of the crack deflection mechanism in improving toughness and provide information on the role played by microstructure in determining the mechanical properties of a composite. (C) 1999 Elsevier Science Limited. All rights reserved.

引用

页码：441 / 449

页数：9

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