Phase Stability of the Laves Phase Cr2Nb in a Two-Phase Cr-Cr2Nb Alloy

被引：0
|
作者：
Kewei LI [1 ]
Shuangming LI [1 ]
Sixiang ZHAO [2 ]
Hong ZHONG [1 ]
Yunlong XUE [1 ]
Hengzhi FU [1 ]
机构：
[1] State Key Laboratory of Solidification Processing,Northwestern Polytechnical University
[2] Institute of Plasma Physics Chinese Academy of Sciences
来源：
Acta Metallurgica Sinica(English Letters) | 2013年 / 26卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Laves phase; Microstructure; Intermetallics; Phase tranformation;
D O I：
暂无
中图分类号：
TG292 [轻金属铸造];
学科分类号：
080201 ; 080503 ;
摘要：
The phase stability of the Laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy produced by arc-melting was investigated using X-ray difraction,transmission electron microscopy and selected area electron difraction.The experimental results indicated that the as-cast ingot was consisted of C15-Cr2Nb and Cr phases;the intermediate C36 and high-temperature C14 modifications of Cr2Nb,reported in literatures,were not detected in this study.These results,combined with a detailed analysis of the actual solidification conditions,revealed that the C14-Cr2Nb was a metastable rather than a stable high-temperature modification.Moreover,a kind of extremely fine lamellar structure was found to be randomly distributed in the eutectic cells,which may be formed by decomposition of the supersaturated C15-Cr2Nb via a discontinuous precipitation reaction.
引用
收藏
页码：687 / 692
页数：6
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