Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy

Okugawa, Masayuki; Ohigashi, Yuta; Furishiro, Yuya; Koizumi, Yuichiro; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.jallcom.2022.165812

Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy

Okugawa, Masayuki; Ohigashi, Yuta; Furishiro, Yuya et al.

Journal of Alloys and Compounds, 2022, 919, 165812

Number of Access:464（2025-08-14 16:33 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89745

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Title	Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy
Creator	NRID 1000070847160 1000070847160 ORCID 0000-0002-6844-6856 0000-0002-6844-6856 researchmap permalink masayuki.okugawa masayuki.okugawa Scopus Author ID 57202824128 57202824128 CreatorName Okugawa, Masayuki
	CreatorName Ohigashi, Yuta
	CreatorName Furishiro, Yuya
	CreatorName Koizumi, Yuichiro
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 CreatorName Nakano, Takayoshi
Subject	Additive manufacturing
	Al-Si hypoeutectic alloy
	Grain refinement
	Multiphase field simulation
	Selective laser-melting
Description	Masayuki Okugawa, Yuta Ohigashi, Yuya Furishiro, Yuichiro Koizumi, Takayoshi Nakano, Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy, Journal of Alloys and Compounds, Volume 919, 2022, 165812, ISSN 0925-8388, https://doi.org/10.1016/j.jallcom.2022.165812.
Abstract	The high strength of Al-Si hypoeutectic alloys additively manufactured by powder-bed fusion is of great scientific interest. To date, the mechanism of grain refinement near the fusion line, which contradicts conventional Hunt's columnar–equiaxed transition criteria, remains to be elucidated. Here we present the first report on the mechanism of grain refinement. When a laser was irradiated on cast Al-Si alloy consisting of coarse α-Al grain and α-Al/Si eutectic regions, grain refinement occurred only near the eutectic regions. This strongly suggests that the Si phase is crucial for grain refinement. Multi-phase-field simulation revealed that rapid heating due to the laser irradiation results in unmelted Si particles even above the liquidus temperature and that the particles act as heterogeneous nucleation sites during the subsequent re-solidification. These results suggest the feasibility of a novel inoculant-free grain refinement that is applicable to eutectic alloys comprising phases with a significant melting point difference.
Publisher	Elsevier
Source Title	Journal of Alloys and Compounds
Volume (Issue)	919
Page	165812
Date of Issued	2022-10-25
Language	English
Handle URL	https://hdl.handle.net/11094/89745
PISSN	09258388
NCID	AA10817249
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.jallcom.2022.165812
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Journal of Alloys and Compounds. 2022, 919, p. 165812
DC.title	Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy
DC.creator	Okugawa, Masayuki
	Ohigashi, Yuta
	Furishiro, Yuya
	Koizumi, Yuichiro
	Nakano, Takayoshi
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2022-10-25
DC.identifier	https://doi.org/10.1016/j.jallcom.2022.165812
DC.subject	Additive manufacturing
	Al-Si hypoeutectic alloy
	Grain refinement
	Multiphase field simulation
	Selective laser-melting
DC.description	Masayuki Okugawa, Yuta Ohigashi, Yuya Furishiro, Yuichiro Koizumi, Takayoshi Nakano, Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy, Journal of Alloys and Compounds, Volume 919, 2022, 165812, ISSN 0925-8388, https://doi.org/10.1016/j.jallcom.2022.165812.
DCTERMS.abstract	The high strength of Al-Si hypoeutectic alloys additively manufactured by powder-bed fusion is of great scientific interest. To date, the mechanism of grain refinement near the fusion line, which contradicts conventional Hunt's columnar–equiaxed transition criteria, remains to be elucidated. Here we present the first report on the mechanism of grain refinement. When a laser was irradiated on cast Al-Si alloy consisting of coarse α-Al grain and α-Al/Si eutectic regions, grain refinement occurred only near the eutectic regions. This strongly suggests that the Si phase is crucial for grain refinement. Multi-phase-field simulation revealed that rapid heating due to the laser irradiation results in unmelted Si particles even above the liquidus temperature and that the particles act as heterogeneous nucleation sites during the subsequent re-solidification. These results suggest the feasibility of a novel inoculant-free grain refinement that is applicable to eutectic alloys comprising phases with a significant melting point difference.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89745
citation_title	Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy
citation_author	Okugawa, Masayuki
	Ohigashi, Yuta
	Furishiro, Yuya
	Koizumi, Yuichiro
	Nakano, Takayoshi
citation_publisher	Elsevier
citation_language	English
citation_date	2022-10-25
citation_journal_title	Journal of Alloys and Compounds
citation_volume	919
citation_firstpage	165812
citation_doi	https://doi.org/10.1016/j.jallcom.2022.165812
citation_public_url	https://hdl.handle.net/11094/89745

Equiaxed grain formation by intrinsic heterogeneous nucleation via rapid heating and cooling in additive manufacturing of aluminum-silicon hypoeutectic alloy

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