Indentation crack profiles in silicon nitride

被引：69

作者：

Lube, T ^{[1
]}

机构：

[1] Montanuniv Leoben, Inst Struktur & Funkt Keram, A-8700 Leoben, Austria

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2001年 / 21卷 / 02期

关键词：

fracture; indentation; optical microscopy; Si3N4; toughness;

D O I：

10.1016/S0955-2219(00)00197-7

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：

Indentation crack profiles that form under Vickers and Knoop indentations in silicon nitride were investigated. Two different experimental techniques were used to obtain a complete representation of the radial/median as well as the lateral crack system and the plastic deformation zone as a function of indentation load. Vickers indentation cracks exhibit a load dependent shape. At low loads two seperate radial cracks form per median plane, at high loads these cracks merge beneath the hardness impression to form an annular crack. Lateral cracks appear much closer to the surface than frequently assumed. Knoop cracks are nearly semielliptical. The crack aspect ratio and the aspect ratio of the elongated wedge-shaped plastic deformation zone are load dependent. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：211 / 218

页数：8

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