Nanoscale phase separation and microstructure evolution during crystallization in Al-Si-Ni amorphous alloy

J. I. Hyun; C. I. Kim; S. W. Nam; W. T. Kim; D. H. Kim

doi:10.1016/j.matdes.2020.108719

Nanoscale phase separation and microstructure evolution during crystallization in Al-Si-Ni amorphous alloy

J. I. Hyun, C. I. Kim, S. W. Nam, W. T. Kim, D. H. Kim

Department of Materials Science and Engineering

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

5 Citations (Scopus)

Abstract

Phase separation and crystallization behavior in melt-spun Al₆₃Si₂₅Ni₁₂ amorphous alloy have been investigated in the present study. Although there is no atomic pair with positive enthalpy of mixing, nm scale phase separation occurs in the as-melt-spun amorphous alloy, exhibiting double-halo diffraction pattern. The amorphous matrix consisting of two different nm-scale Al-rich and Si-rich amorphous phases polymorphically crystallizes into a metastable hexagonal phase by an interface-controlled nucleation and growth mechanism in the first step of crystallization. The metastable hexagonal phase transforms into the mixture of α-Al, Si and Al₃Ni phases possibly by a ternary eutectoid reaction in the second step of crystallization.

Original language	English
Article number	108719
Journal	Materials and Design
Volume	192
DOIs	https://doi.org/10.1016/j.matdes.2020.108719
Publication status	Published - 2020 Jul

Bibliographical note

Funding Information:
This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213).

Funding Information:
This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213 ).

Publisher Copyright:
© 2020

All Science Journal Classification (ASJC) codes

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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title = "Nanoscale phase separation and microstructure evolution during crystallization in Al-Si-Ni amorphous alloy",

abstract = "Phase separation and crystallization behavior in melt-spun Al63Si25Ni12 amorphous alloy have been investigated in the present study. Although there is no atomic pair with positive enthalpy of mixing, nm scale phase separation occurs in the as-melt-spun amorphous alloy, exhibiting double-halo diffraction pattern. The amorphous matrix consisting of two different nm-scale Al-rich and Si-rich amorphous phases polymorphically crystallizes into a metastable hexagonal phase by an interface-controlled nucleation and growth mechanism in the first step of crystallization. The metastable hexagonal phase transforms into the mixture of α-Al, Si and Al3Ni phases possibly by a ternary eutectoid reaction in the second step of crystallization.",

author = "Hyun, {J. I.} and Kim, {C. I.} and Nam, {S. W.} and Kim, {W. T.} and Kim, {D. H.}",

note = "Funding Information: This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213). Funding Information: This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213 ). Publisher Copyright: {\textcopyright} 2020",

year = "2020",

month = jul,

doi = "10.1016/j.matdes.2020.108719",

language = "English",

volume = "192",

journal = "Materials and Design",

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AU - Hyun, J. I.

AU - Kim, C. I.

AU - Nam, S. W.

AU - Kim, W. T.

AU - Kim, D. H.

N1 - Funding Information: This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213). Funding Information: This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213 ). Publisher Copyright: © 2020

PY - 2020/7

Y1 - 2020/7

N2 - Phase separation and crystallization behavior in melt-spun Al63Si25Ni12 amorphous alloy have been investigated in the present study. Although there is no atomic pair with positive enthalpy of mixing, nm scale phase separation occurs in the as-melt-spun amorphous alloy, exhibiting double-halo diffraction pattern. The amorphous matrix consisting of two different nm-scale Al-rich and Si-rich amorphous phases polymorphically crystallizes into a metastable hexagonal phase by an interface-controlled nucleation and growth mechanism in the first step of crystallization. The metastable hexagonal phase transforms into the mixture of α-Al, Si and Al3Ni phases possibly by a ternary eutectoid reaction in the second step of crystallization.

AB - Phase separation and crystallization behavior in melt-spun Al63Si25Ni12 amorphous alloy have been investigated in the present study. Although there is no atomic pair with positive enthalpy of mixing, nm scale phase separation occurs in the as-melt-spun amorphous alloy, exhibiting double-halo diffraction pattern. The amorphous matrix consisting of two different nm-scale Al-rich and Si-rich amorphous phases polymorphically crystallizes into a metastable hexagonal phase by an interface-controlled nucleation and growth mechanism in the first step of crystallization. The metastable hexagonal phase transforms into the mixture of α-Al, Si and Al3Ni phases possibly by a ternary eutectoid reaction in the second step of crystallization.

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Nanoscale phase separation and microstructure evolution during crystallization in Al-Si-Ni amorphous alloy

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