Orientation relationship and interfacial structure between α-Nb5Si3 and Nb solid solution in the eutectic lamellar structure

被引：19

作者：

Cheng, Guangming ^{[1
,3
]}

Tian, Yuxin ^{[2
]}

He, Lianlong ^{[1
]}

Guo, Jianting ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Superalloy Div, Shenyang 110016, Peoples R China

[3] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

PHILOSOPHICAL MAGAZINE | 2009年 / 89卷 / 31期

基金：

中国国家自然科学基金;

关键词：

microstructure; orientation relationship; interfacial structure; alpha-Nb5Si3; transmission electron microscopy; EPITAXIAL NB-AL2O3 INTERFACES; SILICIDE-BASED COMPOSITES; ATOMIC-STRUCTURE; ALLOY; MICROSTRUCTURE; BEHAVIOR; PHASE;

D O I：

10.1080/14786430903128015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The orientation relationship (OR) and the interfacial structure of the eutectic alpha-Nb5Si3 and Nb solid solution (Nbss) lamellar microstructure were investigated by transmission electron microscopy (TEM). The OR between alpha-Nb5Si3 and Nbss was determined as (002)(alpha)//(002)(Nb) and [310](alpha)//[110](Nb). In spite of the significant difference in crystal structure between alpha-Nb5Si3 and Nbss, the interface was found to be semi-coherent with good matching. High-resolution TEM images of the alpha-Nb5Si3/Nbss interface are presented to describe the chemistry of the terminating plane of alpha-Nb5Si3. The results revealed that a pure Nb layer not Si or mixed (Nb + Si) layer of the alpha-Nb5Si3 phase was bonded to the Nb phase at the interface. A periodic array of edge-type misfit dislocations, with line direction [1 (1) over bar0](Nb) and Burgers vector 1/2[1 (1) over bar0](Nb), was observed at the interface.

引用

页码：2801 / 2812

页数：12

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