Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates

Hagihara, Koji; Ueyama, Ryohei; Yamasaki, Michiaki; Kawamura, Yoshihito; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.actamat.2021.116797

Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates

Hagihara, Koji; Ueyama, Ryohei; Yamasaki, Michiaki et al.

Acta Materialia, 2021, 209, 116797

Number of Access:637（2025-08-21 04:36 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89785

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Title	Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates
Creator	NRID 1000010346182 1000010346182 researchmap permalink read0191194 read0191194 Scopus Author ID 7007016278 7007016278 CreatorName Hagihara, Koji
	CreatorName Ueyama, Ryohei
	NRID 1000050343885 1000050343885 CreatorName Yamasaki, Michiaki
	NRID 1000030250814 1000030250814 CreatorName Kawamura, Yoshihito
	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	LPSO-phase
	Mg alloy
	Microstructure
	Nanoplate
	Strength
Description	Hagihara K., Ueyama R., Yamasaki M., et al. Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates. Acta Materialia, 209, 116797. https://doi.org/10.1016/j.actamat.2021.116797.
Abstract	Mg–Zn–Y ternary alloys containing the long-period stacking ordered (LPSO) phase exhibit superior mechanical properties. This is believed to be originating from the LPSO phase acting as the strengthening phase. However, we first clarify that the mechanical properties of the matrix Mg solid solution in the Mg/LPSO two-phase alloy are significantly different from those of pure Mg. The yield stress of a Mg99.2Zn0.2Y0.6 single crystal (matrix Mg solid solution) is almost the same as that of an LPSO single-phase alloy. This is ascribed to the formation of thin stacking-fault-like defects, named “LPSO nanoplate”. In Mg99.2Zn0.2Y0.6, kink-band formation is induced in the same manner as that in the LPSO phase in deformation, resulting in high strength accompanied with increased ductility. Our results suggest that the strengthening mechanism of the Mg/LPSO two-phase alloy must be reconsidered depending on the microstructure. Furthermore, the results suggest that new ultrahigh-strength Mg alloys, which have much lower Zn and Y contents but the mechanical properties are comparable or superior than the present Mg/LPSO two-phase alloys, are expected to be developed via the appropriate control of LPSO nanoplate microstructures.
Publisher	Acta Materialia Inc.
Source Title	Acta Materialia
Volume (Issue)	209
Page	116797
Date of Issued	2021-05-01
Language	English
Handle URL	https://hdl.handle.net/11094/89785
PISSN	13596454
NCID	AA1106787X
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.actamat.2021.116797
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	Acta Materialia. 2021, 209, p. 116797
DC.title	Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates
DC.creator	Hagihara, Koji
	Ueyama, Ryohei
	Yamasaki, Michiaki
	Kawamura, Yoshihito
	Nakano, Takayoshi
DC.publisher	Acta Materialia Inc.
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-05-01
DC.identifier	https://doi.org/10.1016/j.actamat.2021.116797
DC.subject	LPSO-phase
	Mg alloy
	Microstructure
	Nanoplate
	Strength
DC.description	Hagihara K., Ueyama R., Yamasaki M., et al. Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates. Acta Materialia, 209, 116797. https://doi.org/10.1016/j.actamat.2021.116797.
DCTERMS.abstract	Mg–Zn–Y ternary alloys containing the long-period stacking ordered (LPSO) phase exhibit superior mechanical properties. This is believed to be originating from the LPSO phase acting as the strengthening phase. However, we first clarify that the mechanical properties of the matrix Mg solid solution in the Mg/LPSO two-phase alloy are significantly different from those of pure Mg. The yield stress of a Mg99.2Zn0.2Y0.6 single crystal (matrix Mg solid solution) is almost the same as that of an LPSO single-phase alloy. This is ascribed to the formation of thin stacking-fault-like defects, named “LPSO nanoplate”. In Mg99.2Zn0.2Y0.6, kink-band formation is induced in the same manner as that in the LPSO phase in deformation, resulting in high strength accompanied with increased ductility. Our results suggest that the strengthening mechanism of the Mg/LPSO two-phase alloy must be reconsidered depending on the microstructure. Furthermore, the results suggest that new ultrahigh-strength Mg alloys, which have much lower Zn and Y contents but the mechanical properties are comparable or superior than the present Mg/LPSO two-phase alloys, are expected to be developed via the appropriate control of LPSO nanoplate microstructures.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89785
citation_title	Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates
citation_author	Hagihara, Koji
	Ueyama, Ryohei
	Yamasaki, Michiaki
	Kawamura, Yoshihito
	Nakano, Takayoshi
citation_publisher	Acta Materialia Inc.
citation_language	English
citation_date	2021-05-01
citation_journal_title	Acta Materialia
citation_volume	209
citation_firstpage	116797
citation_doi	https://doi.org/10.1016/j.actamat.2021.116797
citation_public_url	https://hdl.handle.net/11094/89785

Surprising increase in yield stress of Mg single crystal using long-period stacking ordered nanoplates

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