Crystallinity, crystalline quality, and microstructural ordering in boron nitride fibers

被引：40

作者：

Bernard, S ^{[1
]}

Chassagneux, F ^{[1
]}

Berthet, MP ^{[1
]}

Cornu, D ^{[1
]}

Miele, P ^{[1
]}

机构：

[1] Univ Lyon 1, CNRS, UMR 5615, Lab Multimat & Interfaces, F-69622 Villeurbanne, France

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2005年 / 88卷 / 06期

关键词：

D O I：

10.1111/j.1551-2916.2005.00318.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 quatitative and quantitative analysis of the microtexture/ microstructure in several experimental boron nitride fibers was investigated by X-ray diffraction and electron microscopy according to their mechanical properties. Young's modulus was controlled by grain orientation. The disordered microstructure of low modulus fibers consisted of amorphous regions and nanometer-sized crystallites arranged in a wide range of orientation. In contrast, high modulus samples showed a coarse-grained microtexture in which crystallites were ordered in a mesohexagonal arrangement along the fiber-axis. Cracks were easily propagated as crystallinity increased, leading to decreased failure strain. The strength-microstructure relationship was obscured by the fiber porosity and defects.

引用

页码：1607 / 1614

页数：8

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