MICROSTRUCTURAL AND CRYSTALLOGRAPHIC RELATIONSHIPS IN DIRECTIONALLY SOLIDIFIED NB-CR2NB AND CR-CR2NB EUTECTICS

被引:61
作者
BEWLAY, BP [1 ]
SUTLIFF, JA [1 ]
JACKSON, MR [1 ]
LIPSITT, HA [1 ]
机构
[1] WRIGHT STATE UNIV, DEPT MECH & MAT ENGN, DAYTON, OH 45435 USA
来源
ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 08期
关键词
D O I
10.1016/0956-7151(94)90228-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present paper describes processing, microstructures and phase relationships in directionally solidified Cr2Nb-Nb and Cr2Nb-Cr eutectics. Both of these eutectics, and the stoichiometric Laves phase Cr2Nb, were directionally solidified using cold crucible Czochralski crystal growth with growth rates from 1 to 15 mm/min. Cr2Nb-Nb had a rod/ribbon-type structure and Cr2 Nb-Cr had a lamellar structure. The crystallographic orientation relationships between both Cr and Nb and the Cr2Nb Laves phase in the individual eutectics were characterized using transmission electron microscopy. Inter-phase orientation relationships in these eutectics were complicated by the transformation of Cr2Nb from the C14 to the C15 crystal structure on post-solidification cooling. Twins were observed in the C15 Cr2Nb phase in both the single phase and eutectic samples. The relationship between the twins, the C14-C15 transformation, and the eutectic morphology is also discussed.
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收藏
页码:2869 / 2878
页数:10
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