Influence of Phase Separation and Spinodal Decomposition on Microstructure of Mg2Si1- xSnx Alloys

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Influence of Phase Separation and Spinodal Decomposition on Microstructure of Mg2Si1- xSnx Alloys. / Sizov, Andrey; Reardon, Hazel; Iversen, Bo B.; Erhart, Paul; Palmqvist, Anders E.C.

In: Crystal Growth and Design, Vol. 19, No. 9, 09.2019, p. 4927-4933.

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Sizov, Andrey ; Reardon, Hazel ; Iversen, Bo B. ; Erhart, Paul ; Palmqvist, Anders E.C. / Influence of Phase Separation and Spinodal Decomposition on Microstructure of Mg2Si1- xSnx Alloys. In: Crystal Growth and Design. 2019 ; Vol. 19, No. 9. pp. 4927-4933.

Bibtex

@article{238b334fcce945d2a76cf4d79c2df34c,
title = "Influence of Phase Separation and Spinodal Decomposition on Microstructure of Mg2Si1- xSnx Alloys",
abstract = "Mg2Si1-xSnx alloys with nominal values of x [0.03:0.18] were synthesized at 780 °C by solid-state reaction from Mg2Si and Mg2Sn and subsequently annealed at either 680 or 580 °C. Their microstructure was investigated by X-ray diffraction using the Rietveld method. Depending on the treatment temperature and the nominal composition, the solid solutions split into different Si- and/or Sn-rich Mg2Si1-xSnx phases. Traces of spinodal decomposition were observed for the samples with a low Sn content independent of treatment temperature due to the limited diffusion kinetics when entering the miscibility gap. A similar effect was observed when applying a higher cooling rate to the samples with higher Sn concentration. In this case, the samples experience thermodynamic spinodal decomposition being located in the spinodal region sufficiently long time at higher temperatures. Samples treated in the miscibility gap showed an agreement of the Si-rich binodal line with calculated phase diagrams. However, the Sn-rich binodal line stays undefined, perhaps due to grain boundary pinning of diffusing atoms. The study elucidates the possibility of tailoring the microstructure of magnesium silicide-stannide alloys utilizing merely judiciously designed heat treatment protocols. A particular attention is brought to spinodal decomposition, which has the potential to reduce the lattice thermal conductivity.",
author = "Andrey Sizov and Hazel Reardon and Iversen, {Bo B.} and Paul Erhart and Palmqvist, {Anders E.C.}",
year = "2019",
month = sep,
doi = "10.1021/acs.cgd.9b00013",
language = "English",
volume = "19",
pages = "4927--4933",
journal = "Crystal Growth & Design",
issn = "1528-7483",
publisher = "AMER CHEMICAL SOC",
number = "9",

}

RIS

TY - JOUR

T1 - Influence of Phase Separation and Spinodal Decomposition on Microstructure of Mg2Si1- xSnx Alloys

AU - Sizov, Andrey

AU - Reardon, Hazel

AU - Iversen, Bo B.

AU - Erhart, Paul

AU - Palmqvist, Anders E.C.

PY - 2019/9

Y1 - 2019/9

N2 - Mg2Si1-xSnx alloys with nominal values of x [0.03:0.18] were synthesized at 780 °C by solid-state reaction from Mg2Si and Mg2Sn and subsequently annealed at either 680 or 580 °C. Their microstructure was investigated by X-ray diffraction using the Rietveld method. Depending on the treatment temperature and the nominal composition, the solid solutions split into different Si- and/or Sn-rich Mg2Si1-xSnx phases. Traces of spinodal decomposition were observed for the samples with a low Sn content independent of treatment temperature due to the limited diffusion kinetics when entering the miscibility gap. A similar effect was observed when applying a higher cooling rate to the samples with higher Sn concentration. In this case, the samples experience thermodynamic spinodal decomposition being located in the spinodal region sufficiently long time at higher temperatures. Samples treated in the miscibility gap showed an agreement of the Si-rich binodal line with calculated phase diagrams. However, the Sn-rich binodal line stays undefined, perhaps due to grain boundary pinning of diffusing atoms. The study elucidates the possibility of tailoring the microstructure of magnesium silicide-stannide alloys utilizing merely judiciously designed heat treatment protocols. A particular attention is brought to spinodal decomposition, which has the potential to reduce the lattice thermal conductivity.

AB - Mg2Si1-xSnx alloys with nominal values of x [0.03:0.18] were synthesized at 780 °C by solid-state reaction from Mg2Si and Mg2Sn and subsequently annealed at either 680 or 580 °C. Their microstructure was investigated by X-ray diffraction using the Rietveld method. Depending on the treatment temperature and the nominal composition, the solid solutions split into different Si- and/or Sn-rich Mg2Si1-xSnx phases. Traces of spinodal decomposition were observed for the samples with a low Sn content independent of treatment temperature due to the limited diffusion kinetics when entering the miscibility gap. A similar effect was observed when applying a higher cooling rate to the samples with higher Sn concentration. In this case, the samples experience thermodynamic spinodal decomposition being located in the spinodal region sufficiently long time at higher temperatures. Samples treated in the miscibility gap showed an agreement of the Si-rich binodal line with calculated phase diagrams. However, the Sn-rich binodal line stays undefined, perhaps due to grain boundary pinning of diffusing atoms. The study elucidates the possibility of tailoring the microstructure of magnesium silicide-stannide alloys utilizing merely judiciously designed heat treatment protocols. A particular attention is brought to spinodal decomposition, which has the potential to reduce the lattice thermal conductivity.

UR - http://www.scopus.com/inward/record.url?scp=85070816626&partnerID=8YFLogxK

U2 - 10.1021/acs.cgd.9b00013

DO - 10.1021/acs.cgd.9b00013

M3 - Journal article

AN - SCOPUS:85070816626

VL - 19

SP - 4927

EP - 4933

JO - Crystal Growth & Design

JF - Crystal Growth & Design

SN - 1528-7483

IS - 9

ER -