Phase stability of the laves phase Cr2Nb in a two-Phase Cr-Cr2Nb alloy

Kewei Li; Shuangming Li; Sixiang Zhao; Hong Zhong; Yunlong Xue; Hengzhi Fu

doi:10.1007/s40195-013-0140-x

Phase stability of the laves phase Cr₂Nb in a two-Phase Cr-Cr₂Nb alloy

Kewei Li, Shuangming Li, Sixiang Zhao, Hong Zhong, Yunlong Xue, Hengzhi Fu

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The phase stability of the Laves phase Cr₂Nb in a two-phase Cr-Cr₂Nb alloy produced by arc-melting was investigated using X-ray diffraction, transmission electron microscopy and selected area electron diffraction. 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-Cr ₂Nb 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.

Original language	English
Pages (from-to)	687-692
Number of pages	6
Journal	Acta Metallurgica Sinica (English Letters)
Volume	26
Issue number	6
DOIs	https://doi.org/10.1007/s40195-013-0140-x
State	Published - Dec 2013

Keywords

Intermetallics
Laves phase
Microstructure
Phase tranformation

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title = "Phase stability of the laves phase Cr2Nb in a two-Phase Cr-Cr2Nb alloy",

abstract = "The phase stability of the Laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy produced by arc-melting was investigated using X-ray diffraction, transmission electron microscopy and selected area electron diffraction. 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-Cr 2Nb 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.",

keywords = "Intermetallics, Laves phase, Microstructure, Phase tranformation",

author = "Kewei Li and Shuangming Li and Sixiang Zhao and Hong Zhong and Yunlong Xue and Hengzhi Fu",

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doi = "10.1007/s40195-013-0140-x",

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T1 - Phase stability of the laves phase Cr2Nb in a two-Phase Cr-Cr2Nb alloy

AU - Li, Kewei

AU - Li, Shuangming

AU - Zhao, Sixiang

AU - Zhong, Hong

AU - Xue, Yunlong

AU - Fu, Hengzhi

PY - 2013/12

Y1 - 2013/12

N2 - The phase stability of the Laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy produced by arc-melting was investigated using X-ray diffraction, transmission electron microscopy and selected area electron diffraction. 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-Cr 2Nb 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.

AB - The phase stability of the Laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy produced by arc-melting was investigated using X-ray diffraction, transmission electron microscopy and selected area electron diffraction. 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-Cr 2Nb 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.

KW - Intermetallics

KW - Laves phase

KW - Microstructure

KW - Phase tranformation

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JO - Acta Metallurgica Sinica (English Letters)

JF - Acta Metallurgica Sinica (English Letters)

IS - 6

ER -

Phase stability of the laves phase Cr₂Nb in a two-Phase Cr-Cr₂Nb alloy

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Keywords

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