Solute atom mediated crystallization of amorphous alloys

Sato, Kazuhisa; Mori, Hirotaro

Materialia, 2023, 32, 101888

Number of Access:85（2025-06-06 18:20 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/97369

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Title
Solute atom mediated crystallization of amorphous alloys
Creator
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
researchmap permalink
read0158304 read0158304
Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
NRID
1000010024366 1000010024366
researchmap permalink
read0014257 read0014257
CreatorName
Mori, Hirotaro
Subject
Amorphous alloy
Crystallization
Electron irradiation
Electronic excitation
Pd-Si
Description
Sato K., Mori H.. Solute atom mediated crystallization of amorphous alloys. Materialia 32, 101888 (2023); https://doi.org/10.1016/j.mtla.2023.101888.
Abstract
We propose a new mechanism of crystallization of amorphous alloy which is mediated by additional solute atoms produced by electronic excitation. For a freestanding Pd-19at%Si amorphous alloy film, electron irradiation causes subtle structural change. By contrast, extensive crystallization of Pd-19at%Si amorphous alloy sandwiched by amorphous (a-) SiOx films, i.e., a-SiOx/a-Pd-Si/a-SiOx, occurred by 75 keV and 200 keV electron irradiation. This crystallization was induced by irradiation not only at room temperature but also even at 90 K. It should be emphasized that the crystallization can be realized by 75 keV irradiation at 90 K via the electronic excitation; where both knock-on damage and a possible thermal crystallization can be excluded. A resultant product of the crystallization after electronic excitation (i.e., electron irradiation), hexagonal Pd2Si, differs from that of thermal annealing (orthorhombic Pd3Si). Evidence for decomposition of a-SiOx by electronic excitation contributes essentially to the crystallization of the a-Pd-Si in the composite film has been obtained in this study. Supply of dissociated Si to the a-Pd-Si layer may cause instability of the amorphous phase, which serves as the trigger for the remarkable structural change; i.e., additional solute atom mediated crystallization.
Publisher
Elsevier B.V.
Source Title
Materialia
Volume (Issue)
32
Page
101888
Date of Issued
2023-12-01
Language
English
Handle URL
https://hdl.handle.net/11094/97369
eISSN
25891529
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.mtla.2023.101888
Access Rights
open access
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This article is licensed under a Creative Commons Attribution 4.0 International License.
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学術雑誌論文 Journal Article