Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion

Ekubaru, Yusufu; Gokcekaya, Ozkan; Ishimoto, Takuya; Sato, Kazuhisa; Manabe, Koki; Wang, Pan; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.matdes.2022.110976

Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion

Ekubaru, Yusufu; Gokcekaya, Ozkan; Ishimoto, Takuya et al.

Materials and Design, 2022, 221, 110976

Number of Access:311（2025-07-18 10:05 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89747

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Title	Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion
Creator	CreatorName Ekubaru, Yusufu
	CreatorName Gokcekaya, Ozkan
	NRID 1000050508835 1000050508835 ORCID 0000-0003-0081-0591 0000-0003-0081-0591 researchmap permalink i_taku i_taku Scopus Author ID 35310484700 35310484700 CreatorName Ishimoto, Takuya
	NRID 1000070314424 1000070314424 ORCID 0000-0001-9078-2541 0000-0001-9078-2541 researchmap permalink read0158304 read0158304 Scopus Author ID 55552977400 55552977400 CreatorName Sato, Kazuhisa
	CreatorName Manabe, Koki
	CreatorName Wang, Pan
	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	Hatch spacing
	Laser powder bed fusion
	Melt pool
	Precipitation
	Scalmalloy
	Ultrafine grain
Description	Ekubaru Y., Gokcekaya O., Ishimoto T., et al. Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion. Materials and Design, 221, 110976. https://doi.org/10.1016/j.matdes.2022.110976.
Abstract	The bimodal microstructure, which comprises ultrafine grains (UFGs) forming along the melt pool boundary and relatively coarse grains inside the melt pool, is a characteristic of the Sc-Zr-modified Al–Mg-based alloy (Scalmalloy) microstructure manufactured using laser powder bed fusion (LPBF). Focusing on this microstructural feature, we investigated the improvement in the mechanical properties of LPBF-fabricated Scalmalloy by tailoring the volume fraction of UFGs. Our approach was to decrease the laser hatch spacing (d) from 0.1 to 0.04 mm, while the volume fraction of UFGs increased from 34.6 ± 0.6 % (d = 0.1 mm) to 59.5 ± 0.5 % (d = 0.06 mm). The tensile yield stress increased from 296 ± 9 (d = 0.1 mm) to 380 ± 6 MPa (d = 0.06 mm), while maintaining a large elongation (14.8 % ± 1.2 %). The yield stress and elongation were superior to those of the cast counterparts by 2.9 and 4.0 times, respectively. In the sample with d = 0.04 mm, pores formed owing to excessive thermal energy input. Additionally, we investigated multiple strengthening mechanisms of the as-fabricated alloy. This is the first study to improve the mechanical properties of LPBF-fabricated Scalmalloy by optimizing the track-to-track interval and tuning the UFG fraction.
Publisher	Elsevier
Source Title	Materials and Design
Volume (Issue)	221
Page	110976
Date of Issued	2022-09-01
Language	English
Handle URL	https://hdl.handle.net/11094/89747
PISSN	02641275
eISSN	18734197
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.matdes.2022.110976
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	Materials and Design. 2022, 221, p. 110976
DC.title	Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion
DC.creator	Ekubaru, Yusufu
	Gokcekaya, Ozkan
	Ishimoto, Takuya
	Sato, Kazuhisa
	Manabe, Koki
	Wang, Pan
	Nakano, Takayoshi
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2022-09-01
DC.identifier	https://doi.org/10.1016/j.matdes.2022.110976
DC.subject	Hatch spacing
	Laser powder bed fusion
	Melt pool
	Precipitation
	Scalmalloy
	Ultrafine grain
DC.description	Ekubaru Y., Gokcekaya O., Ishimoto T., et al. Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion. Materials and Design, 221, 110976. https://doi.org/10.1016/j.matdes.2022.110976.
DCTERMS.abstract	The bimodal microstructure, which comprises ultrafine grains (UFGs) forming along the melt pool boundary and relatively coarse grains inside the melt pool, is a characteristic of the Sc-Zr-modified Al–Mg-based alloy (Scalmalloy) microstructure manufactured using laser powder bed fusion (LPBF). Focusing on this microstructural feature, we investigated the improvement in the mechanical properties of LPBF-fabricated Scalmalloy by tailoring the volume fraction of UFGs. Our approach was to decrease the laser hatch spacing (d) from 0.1 to 0.04 mm, while the volume fraction of UFGs increased from 34.6 ± 0.6 % (d = 0.1 mm) to 59.5 ± 0.5 % (d = 0.06 mm). The tensile yield stress increased from 296 ± 9 (d = 0.1 mm) to 380 ± 6 MPa (d = 0.06 mm), while maintaining a large elongation (14.8 % ± 1.2 %). The yield stress and elongation were superior to those of the cast counterparts by 2.9 and 4.0 times, respectively. In the sample with d = 0.04 mm, pores formed owing to excessive thermal energy input. Additionally, we investigated multiple strengthening mechanisms of the as-fabricated alloy. This is the first study to improve the mechanical properties of LPBF-fabricated Scalmalloy by optimizing the track-to-track interval and tuning the UFG fraction.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89747
citation_title	Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion
citation_author	Ekubaru, Yusufu
	Gokcekaya, Ozkan
	Ishimoto, Takuya
	Sato, Kazuhisa
	Manabe, Koki
	Wang, Pan
	Nakano, Takayoshi
citation_publisher	Elsevier
citation_language	English
citation_date	2022-09-01
citation_journal_title	Materials and Design
citation_volume	221
citation_firstpage	110976
citation_doi	https://doi.org/10.1016/j.matdes.2022.110976
citation_public_url	https://hdl.handle.net/11094/89747

Excellent strength–ductility balance of Sc-Zr-modified Al–Mg alloy by tuning bimodal microstructure via hatch spacing in laser powder bed fusion

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