Microstructural and crystallographic relationships in directionally solidified Nb-Cr[sub 2]Nb and Cr-Cr[sub 2]Nb eutectics
- General Electric Co., Schenectady, NY (United States). Corporate Research and Development Center
- Wright State Univ., Dayton, OH (United States). Dept. of Mechanical and Materials Engineering
The present paper describes processing, microstructures and phase relationships in directionally solidified Cr[sub 2]Nb-Nb and Cr[sub 2]Nb-C eutectics. Both of these eutectics, and the stoichiometric Laves phase Cr[sub 2]Nb, were directionally solidified using cold crucible Czochralski crystal growth with growth rates from 1 to 15 mm/min. Cr[sub 2]Nb-Nb had a rod/ribbon-type structure and Cr[sub 2]Nb-Cr had a lamellar structure. The crystallographic orientation relationships between both Cr and Nb and the Cr[sub 2]Nb 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 Cr[sub 2]Nb from the C14 to the C15 crystal structure on post-solidification cooling. Twins were observed in the C15 Cr[sub 2]Nb 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.
- OSTI ID:
- 6987574
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:8; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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