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.

引用

页码：2869 / 2878

页数：10

共 15 条

[1]

ALLEN CW, 1985, MATER RES SOC S P, V39, P141

[2] HIGH-TEMPERATURE EVALUATION OF TOPOLOGICALLY CLOSE PACKED INTERMETALLICS [J].

ANTON, DL ;

SHAH, DM .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1992, 153 (1-2) :410-415

[3]

ANTON DL, WRDCTR904122 US AIR

[4]

Bewlay B. P., 1994, Materials and Manufacturing Processes, V9, P89, DOI 10.1080/10426919408934887

[5]

CHANG KM, 1992, JOM-J MIN MET MAT S, V44, P59

[6]

DUWEZ P, 1952, T AM I MIN MET ENG, V194, P72

[7] THE CONSTITUTION OF THE CHROMIUM NIOBIUM MOLYBDENUM SYSTEM [J].

GOLDSCHMIDT, HJ ;

BRAND, JA .

JOURNAL OF THE LESS-COMMON METALS, 1961, 3 (01) :44-61

[8]

HAZZLEDINE PM, 1993, MAT RES S C, V288, P591

[9]

HOMAS DJ, 1992, MAT SCI ENG A-STRUCT, V156, P97

[10]

HUNT JD, 1966, T METALL SOC AIME, V236, P843

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