Halo formation in arc-melted Cr-Nb alloys

K. W. Li, S. M. Li, Y. L. Xue, H. Z. Fu

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摘要

Haloes of Laves phase Cr 2Nb around the primary dendrites Cr were observed in the arc-melted Cr-12% Nb hypoeutectic alloy, while no halo of non-faceted Cr phase around the Cr 2Nb Laves phase occurred in the Cr-20% Nb hypereutectic alloy. This observation differs from the haloes formed in metal-intermetallic alloy systems. An explanation on the formation of Cr 2Nb halo was presented by considering the solidification behavior of the leading phase and non-reciprocal nucleation characteristics of the Cr 2Nb/Cr eutectic. In the Cr-12% Nb alloy, primary dendrites Cr worked as a good nucleant available for the occurrence of the halo Cr 2Nb that subsequently solidified as the leading phase in the eutectic. For the Cr-20% Nb alloy, primary dendrites Cr 2Nb first precipitated as the leading phase inducing the eutectic formation, resulting in no halo growth. In addition, the coupled zone of the Cr-Nb alloy was theoretically predicted in agreement with the experimental results.

源语言英语
页(从-至)30-34
页数5
期刊Journal of Crystal Growth
357
1
DOI
出版状态已出版 - 15 10月 2012

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