STRUCTURAL CHARACTERIZATION OF THE BETA-SI3N4 WHISKER AL INTERFACES IN A BETA-SI3N4 WHISKER AL ALLOY-6061 COMPOSITE-MATERIAL

被引：24

作者：

NING, XG ^{[1
]}

PAN, J ^{[1
]}

HU, KY ^{[1
]}

YE, HQ ^{[1
]}

机构：

[1] CHANGSHA INST TECHNOL,CHANGSHA 410073,PEOPLES R CHINA

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1992年 / 66卷 / 05期

关键词：

D O I：

10.1080/01418619208201591

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural characterization of the whisker matrix interface in a beta-Si3N4 whisker-Al alloy 6061 composite was investigated by high-resolution transmission electron microscopy (HRTEM). It was shown that there existed a nearly amorphous layer (2-3 nm thickness) between the whiskers and the Al matrix. Mg segregation at the whisker Al interface was revealed by energy-dispersive X-ray analysis. HRTEM observations indicated that MgO and MgAl2O4 nanocrystalline particles were easily formed at the whisker-Al interface in the composite owing to Mg segregation at the interface during the manufacturing of the composite. The Mg2Si particles (strengthening phase in the matrix) precipitated preferentially at the whisker-Al interface when the composite had been given a T6 heat treatment. Specific orientation relationships between the MgAl2O4 or Mg2Si particles and the beta-Si3N4 whiskers were found. The problems associated with characterizing the microstructure of a whisker-matrix interface in an Al alloy composite reinforced by whiskers are also discussed.

引用

页码：811 / 821

页数：11

共 6 条

[1]

ALEXANDER KB, 1990, P MATERIALS RES SOC, V183, P273

[2] CHARACTERIZATION OF BETA-SILICON NITRIDE WHISKERS [J].