Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys

Hagihara, Koji; Li, Zixuan; Yamasaki, Michiaki; Kawamura, Yoshihito; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.actamat.2018.10.016

Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys

Hagihara, Koji; Li, Zixuan; Yamasaki, Michiaki et al.

Acta Materialia, 2019, 163, 226-239

アクセス数:121件（2025-04-03 22:16 集計）

固定URL: https://hdl.handle.net/11094/89825

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タイトル	Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys
著者	NRID 1000010346182 1000010346182 researchmap permalink read0191194 read0191194 Scopus Author ID 7007016278 7007016278 著者名 Hagihara, Koji
	著者名 Li, Zixuan
	NRID 1000050343885 1000050343885 著者名 Yamasaki, Michiaki
	NRID 1000030250814 1000030250814 著者名 Kawamura, Yoshihito
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 著者名 Nakano, Takayoshi
キーワード等	Deformation kink
	Deformation structure
	Extrusion
	Magnesium alloys
	Strengthening mechanism
内容	Hagihara K., Li Z., Yamasaki M., et al. Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys. Acta Materialia, 163, 226. https://doi.org/10.1016/j.actamat.2018.10.016.
抄録	The unusual increase in the strength by extrusion is a unique feature of recently developed Mg alloys containing the LPSO phase. In this study, we first elucidated the detailed mechanisms that induce this drastic strengthening. The dependencies of the deformation behavior of a Mg88Zn4Y7 extruded alloy, which contains ∼86-vol% LPSO phase, on the temperature, loading orientation, and extrusion ratio were examined. It was found that the yield stress of the alloy is drastically increased by extrusion, but the magnitude of the increase in the yield stress is significantly different depending on the loading orientation. That is, the strengthening of the LPSO phase by extrusion shows a strong anisotropy. By the detailed analyses, this was clarified to be derived from the variation in the deformation mechanisms depending on the loading orientation and extrusion ratio. Basal slip was found to govern the deformation behavior when the loading axis was inclined at a 45° to the extrusion direction, while the predominant deformation mechanism varies from basal slip to the formation of deformation kink bands as the extrusion ratio increased when the loading axis was parallel to the extrusion direction. Moreover, it was clarified in this study that the introduction of a deformation-kink-band boundary during extrusion effectively acts as a strong obstacle to basal slip. That is, “the kink band strengthening” was first quantitatively elucidated, which contributes to the drastic increase in the yield stress of the extruded LPSO-phase alloys in the wide temperature range below 400 °C.
出版者	Acta Materialia Inc.
収録物名	Acta Materialia
巻(号)	163
ページ	226-239
刊行年月	2019-01-15
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89825
PISSN	13596454
NCID	AA1106787X
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.actamat.2018.10.016
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Acta Materialia. 2019, 163, p. 226-239
DC.title	Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys
DC.creator	Hagihara, Koji
	Li, Zixuan
	Yamasaki, Michiaki
	Kawamura, Yoshihito
	Nakano, Takayoshi
DC.publisher	Acta Materialia Inc.
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2019-01-15
DC.identifier	https://doi.org/10.1016/j.actamat.2018.10.016
DC.subject	Deformation kink
	Deformation structure
	Extrusion
	Magnesium alloys
	Strengthening mechanism
DC.description	Hagihara K., Li Z., Yamasaki M., et al. Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys. Acta Materialia, 163, 226. https://doi.org/10.1016/j.actamat.2018.10.016.
DCTERMS.abstract	The unusual increase in the strength by extrusion is a unique feature of recently developed Mg alloys containing the LPSO phase. In this study, we first elucidated the detailed mechanisms that induce this drastic strengthening. The dependencies of the deformation behavior of a Mg88Zn4Y7 extruded alloy, which contains ∼86-vol% LPSO phase, on the temperature, loading orientation, and extrusion ratio were examined. It was found that the yield stress of the alloy is drastically increased by extrusion, but the magnitude of the increase in the yield stress is significantly different depending on the loading orientation. That is, the strengthening of the LPSO phase by extrusion shows a strong anisotropy. By the detailed analyses, this was clarified to be derived from the variation in the deformation mechanisms depending on the loading orientation and extrusion ratio. Basal slip was found to govern the deformation behavior when the loading axis was inclined at a 45° to the extrusion direction, while the predominant deformation mechanism varies from basal slip to the formation of deformation kink bands as the extrusion ratio increased when the loading axis was parallel to the extrusion direction. Moreover, it was clarified in this study that the introduction of a deformation-kink-band boundary during extrusion effectively acts as a strong obstacle to basal slip. That is, “the kink band strengthening” was first quantitatively elucidated, which contributes to the drastic increase in the yield stress of the extruded LPSO-phase alloys in the wide temperature range below 400 °C.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89825
citation_title	Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys
citation_author	Hagihara, Koji
	Li, Zixuan
	Yamasaki, Michiaki
	Kawamura, Yoshihito
	Nakano, Takayoshi
citation_publisher	Acta Materialia Inc.
citation_language	英語
citation_date	2019-01-15
citation_journal_title	Acta Materialia
citation_volume	163
citation_firstpage	226
citation_lastpage	239
citation_doi	https://doi.org/10.1016/j.actamat.2018.10.016
citation_public_url	https://hdl.handle.net/11094/89825

Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys

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