In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt

Di Zhang; Junfeng Xu; Feng Liu

doi:10.1007/s11661-015-3104-0

In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt

Di Zhang
, Junfeng Xu
, Feng Liu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian
Xi'an Technological University

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

13 Scopus citations

Abstract

High-speed video (HSV) technique was used to investigate the solidification behavior of undercooled Fe-17at. pctB alloy melt. Competitive growth between Fe/Fe₃B (metastable eutectic) and Fe/Fe₂B (stable eutectic) was captured, which is correlated with the critical nucleation undercooling ΔTn^∗[=104 K (104 °C)] and the critical growth undercooling ΔTg^∗[=151 K~183 K (151 °C~183 °C)]. For the initial undercooling, ΔT<ΔTn^∗, only the stable eutectic reaction (L → Fe/Fe₂B) occurs during solidification, whereas, for ΔT>ΔTn^∗, the metastable eutectic reaction (L → Fe/Fe₃B) occurs firstly, followed by the stable eutectic reaction. Nevertheless, ΔT>ΔTn^∗ does not guarantee that the metastable phase (Fe₃B) appears finally. Only if ΔT>ΔTg^∗, Fe₃B phase can be found in the room microstructure, as the growth velocity of metastable eutectic (Fe/Fe₃B) is larger than stable eutectic (Fe/Fe₂B) from HSV results; otherwise, the final structure consists of Fe₂B and α-Fe. Accordingly, not only the competitive nucleation, but the competitive growth also determines the final microstructure of Fe-17at. pctB alloy.

Original language	English
Pages (from-to)	5232-5239
Number of pages	8
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	46
Issue number	11
DOIs	https://doi.org/10.1007/s11661-015-3104-0
State	Published - 1 Nov 2015

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10.1007/s11661-015-3104-0

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@article{bdb2734d900b4bc9b2f7736c366f439b,

title = " In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt",

abstract = "High-speed video (HSV) technique was used to investigate the solidification behavior of undercooled Fe-17at. pctB alloy melt. Competitive growth between Fe/Fe3B (metastable eutectic) and Fe/Fe2B (stable eutectic) was captured, which is correlated with the critical nucleation undercooling ΔTn∗[=104 K (104 °C)] and the critical growth undercooling ΔTg∗[=151 K\textasciitilde{}183 K (151 °C\textasciitilde{}183 °C)]. For the initial undercooling, ΔT<ΔTn∗, only the stable eutectic reaction (L → Fe/Fe2B) occurs during solidification, whereas, for ΔT>ΔTn∗, the metastable eutectic reaction (L → Fe/Fe3B) occurs firstly, followed by the stable eutectic reaction. Nevertheless, ΔT>ΔTn∗ does not guarantee that the metastable phase (Fe3B) appears finally. Only if ΔT>ΔTg∗, Fe3B phase can be found in the room microstructure, as the growth velocity of metastable eutectic (Fe/Fe3B) is larger than stable eutectic (Fe/Fe2B) from HSV results; otherwise, the final structure consists of Fe2B and α-Fe. Accordingly, not only the competitive nucleation, but the competitive growth also determines the final microstructure of Fe-17at. pctB alloy.",

author = "Di Zhang and Junfeng Xu and Feng Liu",

note = "Publisher Copyright: {\textcopyright} 2015, The Minerals, Metals \& Materials Society and ASM International.",

year = "2015",

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doi = "10.1007/s11661-015-3104-0",

language = "英语",

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In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt. / Zhang, Di; Xu, Junfeng; Liu, Feng.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 46, No. 11, 01.11.2015, p. 5232-5239.

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

TY - JOUR

T1 - In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt

AU - Zhang, Di

AU - Xu, Junfeng

AU - Liu, Feng

PY - 2015/11/1

Y1 - 2015/11/1

N2 - High-speed video (HSV) technique was used to investigate the solidification behavior of undercooled Fe-17at. pctB alloy melt. Competitive growth between Fe/Fe3B (metastable eutectic) and Fe/Fe2B (stable eutectic) was captured, which is correlated with the critical nucleation undercooling ΔTn∗[=104 K (104 °C)] and the critical growth undercooling ΔTg∗[=151 K~183 K (151 °C~183 °C)]. For the initial undercooling, ΔT<ΔTn∗, only the stable eutectic reaction (L → Fe/Fe2B) occurs during solidification, whereas, for ΔT>ΔTn∗, the metastable eutectic reaction (L → Fe/Fe3B) occurs firstly, followed by the stable eutectic reaction. Nevertheless, ΔT>ΔTn∗ does not guarantee that the metastable phase (Fe3B) appears finally. Only if ΔT>ΔTg∗, Fe3B phase can be found in the room microstructure, as the growth velocity of metastable eutectic (Fe/Fe3B) is larger than stable eutectic (Fe/Fe2B) from HSV results; otherwise, the final structure consists of Fe2B and α-Fe. Accordingly, not only the competitive nucleation, but the competitive growth also determines the final microstructure of Fe-17at. pctB alloy.

AB - High-speed video (HSV) technique was used to investigate the solidification behavior of undercooled Fe-17at. pctB alloy melt. Competitive growth between Fe/Fe3B (metastable eutectic) and Fe/Fe2B (stable eutectic) was captured, which is correlated with the critical nucleation undercooling ΔTn∗[=104 K (104 °C)] and the critical growth undercooling ΔTg∗[=151 K~183 K (151 °C~183 °C)]. For the initial undercooling, ΔT<ΔTn∗, only the stable eutectic reaction (L → Fe/Fe2B) occurs during solidification, whereas, for ΔT>ΔTn∗, the metastable eutectic reaction (L → Fe/Fe3B) occurs firstly, followed by the stable eutectic reaction. Nevertheless, ΔT>ΔTn∗ does not guarantee that the metastable phase (Fe3B) appears finally. Only if ΔT>ΔTg∗, Fe3B phase can be found in the room microstructure, as the growth velocity of metastable eutectic (Fe/Fe3B) is larger than stable eutectic (Fe/Fe2B) from HSV results; otherwise, the final structure consists of Fe2B and α-Fe. Accordingly, not only the competitive nucleation, but the competitive growth also determines the final microstructure of Fe-17at. pctB alloy.

UR - https://www.scopus.com/pages/publications/84942987235

U2 - 10.1007/s11661-015-3104-0

DO - 10.1007/s11661-015-3104-0

M3 - 文章

AN - SCOPUS:84942987235

SN - 1073-5623

VL - 46

SP - 5232

EP - 5239

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

IS - 11

ER -

In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt

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