Processing and properties of MoSi2-SiC and MoSi2-Al2O3

被引：61

作者：

Newman, A ^{[1
]}

Sampath, S ^{[1
]}

Herman, H ^{[1
]}

机构：

[1] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 261卷 / 1-2期

关键词：

molybdenum disilicide; high temperature; impurity distribution;

D O I：

10.1016/S0921-5093(98)01073-9

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Molybdenum disilicide (MoSi2) is a candidate material for high temperature structural applications due to its high melting point and excellent oxidation resistance. A major impediment to implementing this material is its low temperature fracture toughness. Earlier studies examined polycrystalline MoSi2 for the role of grain size and SiO2 impurity distribution on the fracture response via indentation. The goal of this study is to apply this indentation analysis to MoSi2 containing additions of either Al2O3, or SiC. These additions modify the microstructure and result in changes to the indentation cracking behavior. Indentation crack responses and crack lengths are recorded and the fracture toughness values are determined. An explanation is presented for the formation of a tortuous crack path that increases the fracture toughness for the sample with the SiC addition. (C) 1999 Published by Elsevier Science S.A. All rights reserved.

引用

页码：252 / 260

页数：9

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