Halo Formation in Binary Fe-Nb Off-eutectic Alloys

K. W. Li; X. B. Wang; S. M. Li; W. X. Wang; S. P. Chen; D. Q. Gong; J. L. Cui

doi:10.1515/htmp-2014-0081

Halo Formation in Binary Fe-Nb Off-eutectic Alloys

K. W. Li, X. B. Wang, S. M. Li, W. X. Wang, S. P. Chen, D. Q. Gong, J. L. Cui

School of Materials Sience and Engineering

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

11 Scopus citations

Abstract

In the Fe-Fe₂Nb eutectic system, halo formations were observed at both the hypo-and hypereutectic compositions. This observation cannot be well explained by the existing halo theories based on competitive growth or competitive nucleating alone. In the present paper, a new explanation is proposed to describe the formation of halos in the binary Fe-Fe₂Nb off-eutectic alloys. By theoretical calculations, the α-Fe and Fe₂Nb are predicted to be the primary growing phase in the hypo-and hypereutectic compositions, respectively. Based on the experimental observations, the Fe₂Nb Laves phase was identified as a good nueleant for α-Fe phase, but not vice versa. By analysing of the competitive growth among the involved phases and the growth undercoolings of the two individual eutectic phases, the formation of halos in the Fe-Fe₂Nb alloys is explained successfully.

Original language	English
Pages (from-to)	479-485
Number of pages	7
Journal	High Temperature Materials and Processes
Volume	34
Issue number	5
DOIs	https://doi.org/10.1515/htmp-2014-0081
State	Published - 1 Aug 2015

Keywords

competitive growth
Halo
Laves phase
primary growing phase

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title = "Halo Formation in Binary Fe-Nb Off-eutectic Alloys",

abstract = "In the Fe-Fe2Nb eutectic system, halo formations were observed at both the hypo-and hypereutectic compositions. This observation cannot be well explained by the existing halo theories based on competitive growth or competitive nucleating alone. In the present paper, a new explanation is proposed to describe the formation of halos in the binary Fe-Fe2Nb off-eutectic alloys. By theoretical calculations, the α-Fe and Fe2Nb are predicted to be the primary growing phase in the hypo-and hypereutectic compositions, respectively. Based on the experimental observations, the Fe2Nb Laves phase was identified as a good nueleant for α-Fe phase, but not vice versa. By analysing of the competitive growth among the involved phases and the growth undercoolings of the two individual eutectic phases, the formation of halos in the Fe-Fe2Nb alloys is explained successfully.",

keywords = "competitive growth, Halo, Laves phase, primary growing phase",

author = "Li, {K. W.} and Wang, {X. B.} and Li, {S. M.} and Wang, {W. X.} and Chen, {S. P.} and Gong, {D. Q.} and Cui, {J. L.}",

note = "Publisher Copyright: {\textcopyright} 2015 by De Gruyter.",

year = "2015",

month = aug,

day = "1",

doi = "10.1515/htmp-2014-0081",

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T1 - Halo Formation in Binary Fe-Nb Off-eutectic Alloys

AU - Li, K. W.

AU - Wang, X. B.

AU - Li, S. M.

AU - Wang, W. X.

AU - Chen, S. P.

AU - Gong, D. Q.

AU - Cui, J. L.

PY - 2015/8/1

Y1 - 2015/8/1

N2 - In the Fe-Fe2Nb eutectic system, halo formations were observed at both the hypo-and hypereutectic compositions. This observation cannot be well explained by the existing halo theories based on competitive growth or competitive nucleating alone. In the present paper, a new explanation is proposed to describe the formation of halos in the binary Fe-Fe2Nb off-eutectic alloys. By theoretical calculations, the α-Fe and Fe2Nb are predicted to be the primary growing phase in the hypo-and hypereutectic compositions, respectively. Based on the experimental observations, the Fe2Nb Laves phase was identified as a good nueleant for α-Fe phase, but not vice versa. By analysing of the competitive growth among the involved phases and the growth undercoolings of the two individual eutectic phases, the formation of halos in the Fe-Fe2Nb alloys is explained successfully.

AB - In the Fe-Fe2Nb eutectic system, halo formations were observed at both the hypo-and hypereutectic compositions. This observation cannot be well explained by the existing halo theories based on competitive growth or competitive nucleating alone. In the present paper, a new explanation is proposed to describe the formation of halos in the binary Fe-Fe2Nb off-eutectic alloys. By theoretical calculations, the α-Fe and Fe2Nb are predicted to be the primary growing phase in the hypo-and hypereutectic compositions, respectively. Based on the experimental observations, the Fe2Nb Laves phase was identified as a good nueleant for α-Fe phase, but not vice versa. By analysing of the competitive growth among the involved phases and the growth undercoolings of the two individual eutectic phases, the formation of halos in the Fe-Fe2Nb alloys is explained successfully.

KW - competitive growth

KW - Halo

KW - Laves phase

KW - primary growing phase

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U2 - 10.1515/htmp-2014-0081

DO - 10.1515/htmp-2014-0081

M3 - 文章

AN - SCOPUS:84941654786

SN - 0334-6455

VL - 34

SP - 479

EP - 485

JO - High Temperature Materials and Processes

JF - High Temperature Materials and Processes

IS - 5

ER -

Halo Formation in Binary Fe-Nb Off-eutectic Alloys

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Keywords

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