Phase selection in supercooled Cu-Nb alloys

A. Munitz; M. Bamberger; A. Venkert; P. Landau; R. Abbaschian

doi:10.1007/s10853-008-3115-y

Phase selection in supercooled Cu-Nb alloys

A. Munitz, M. Bamberger, A. Venkert, P. Landau, R. Abbaschian

Department of Materials Engineering

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

30 Scopus citations

Abstract

Electromagnetic levitation was used to determine Cu-Nb phase diagram and to study supercooling effects on solidification characteristics of the alloys containing 5-70 wt% Nb. The Cu-Nb stable phase diagram was found to exhibit near-flat liquidus with a peritectic reaction at 1093 °C. Melt separation was found only for specimens containing approximately 20 wt% Nb. The results indicate that melt separation in the alloy requires supercooling exceeding 230 K combined with high cooling rates during solidification. Some specimens quenched from the solid + liquid zone on a copper chill also show evidence of melt separation which is attributed to minor oxygen impurities. Nb-rich liquid which nucleates below the T ₀ curve solidifies as a metastable Nb-bcc lattice containing only 67 wt% Nb as compared to 96 wt% of the regular Nb dendrites.

Original language	English
Pages (from-to)	64-73
Number of pages	10
Journal	Journal of Materials Science
Volume	44
Issue number	1
DOIs	https://doi.org/10.1007/s10853-008-3115-y
State	Published - 1 Jan 2009

ASJC Scopus subject areas

Ceramics and Composites
Materials Science (miscellaneous)
General Materials Science
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics

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abstract = "Electromagnetic levitation was used to determine Cu-Nb phase diagram and to study supercooling effects on solidification characteristics of the alloys containing 5-70 wt% Nb. The Cu-Nb stable phase diagram was found to exhibit near-flat liquidus with a peritectic reaction at 1093 °C. Melt separation was found only for specimens containing approximately 20 wt% Nb. The results indicate that melt separation in the alloy requires supercooling exceeding 230 K combined with high cooling rates during solidification. Some specimens quenched from the solid + liquid zone on a copper chill also show evidence of melt separation which is attributed to minor oxygen impurities. Nb-rich liquid which nucleates below the T 0 curve solidifies as a metastable Nb-bcc lattice containing only 67 wt% Nb as compared to 96 wt% of the regular Nb dendrites.",

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AU - Munitz, A.

AU - Bamberger, M.

AU - Venkert, A.

AU - Landau, P.

AU - Abbaschian, R.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Electromagnetic levitation was used to determine Cu-Nb phase diagram and to study supercooling effects on solidification characteristics of the alloys containing 5-70 wt% Nb. The Cu-Nb stable phase diagram was found to exhibit near-flat liquidus with a peritectic reaction at 1093 °C. Melt separation was found only for specimens containing approximately 20 wt% Nb. The results indicate that melt separation in the alloy requires supercooling exceeding 230 K combined with high cooling rates during solidification. Some specimens quenched from the solid + liquid zone on a copper chill also show evidence of melt separation which is attributed to minor oxygen impurities. Nb-rich liquid which nucleates below the T 0 curve solidifies as a metastable Nb-bcc lattice containing only 67 wt% Nb as compared to 96 wt% of the regular Nb dendrites.

AB - Electromagnetic levitation was used to determine Cu-Nb phase diagram and to study supercooling effects on solidification characteristics of the alloys containing 5-70 wt% Nb. The Cu-Nb stable phase diagram was found to exhibit near-flat liquidus with a peritectic reaction at 1093 °C. Melt separation was found only for specimens containing approximately 20 wt% Nb. The results indicate that melt separation in the alloy requires supercooling exceeding 230 K combined with high cooling rates during solidification. Some specimens quenched from the solid + liquid zone on a copper chill also show evidence of melt separation which is attributed to minor oxygen impurities. Nb-rich liquid which nucleates below the T 0 curve solidifies as a metastable Nb-bcc lattice containing only 67 wt% Nb as compared to 96 wt% of the regular Nb dendrites.

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Phase selection in supercooled Cu-Nb alloys

Abstract

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