Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands

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

doi:https://doi.org/10.1016/j.msea.2019.138163

Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands

Hagihara, Koji; Yamasaki, Michiaki; Kawamura, Yoshihito et al.

Materials Science and Engineering A, 2019, 763, 138163

アクセス数:115件（2025-04-03 21:45 集計）

固定URL: https://hdl.handle.net/11094/89816

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タイトル	Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands
著者	NRID 1000010346182 1000010346182 researchmap permalink read0191194 read0191194 Scopus Author ID 7007016278 7007016278 著者名 Hagihara, Koji
	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	Basal slip
	Deformation kink band
	Dislocation
	LPSO-Phase
	Microstructure
内容	Hagihara K., Yamasaki M., Kawamura Y., et al. Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands. Materials Science and Engineering A, 763, 138163. https://doi.org/10.1016/j.msea.2019.138163.
抄録	The mechanical properties of the Mg-based LPSO-phase are expected to be strongly affected by the microstructure due to its anisotropic crystal structure. However, the fine details have not been sufficiently understood yet. This study first clarified the detailed microstructural factors that govern the strength of the LPSO-phase by examining alloys with microstructures that were significantly varied via directional solidification and extrusion processes. Refining the microstructure is significantly effective for strengthening LPSO-phase alloys. The yield stress of LPSO-phase alloys with random texture was previously reported to be increased by reducing the “length” of plate-like LPSO-phase grains. In addition, it was found in this study that the formation stress in the deformation kink band, which is a unique deformation mode in an LPSO-phase alloy, can be increased by decreasing the “thickness” of the grains. Furthermore, the study used directionally solidified crystals provided direct evidence that the introduction of the deformation kink band effectively increases the yield stress and work-hardening rate of alloys by hindering the motion of basal dislocations. This “kink-band strengthening” was found to have considerable temperature dependence. The strengthening is significant at or below 200 °C, but the effect gradually decreases above 300 °C and is accompanied by the operation of non-basal slip. The results quantitatively clarified that kink-band strengthening is one predominant reason why the LPSO-phase extruded alloy exhibits an unusually high yield stress at any loading orientation.
出版者	Elsevier
収録物名	Materials Science and Engineering A
巻(号)	763
ページ	138163
刊行年月	2019-08-19
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89816
PISSN	09215093
NCID	AA10720420
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.msea.2019.138163
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	Materials Science and Engineering A. 2019, 763, p. 138163
DC.title	Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands
DC.creator	Hagihara, Koji
	Yamasaki, Michiaki
	Kawamura, Yoshihito
	Nakano, Takayoshi
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2019-08-19
DC.identifier	https://doi.org/10.1016/j.msea.2019.138163
DC.subject	Basal slip
	Deformation kink band
	Dislocation
	LPSO-Phase
	Microstructure
DC.description	Hagihara K., Yamasaki M., Kawamura Y., et al. Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands. Materials Science and Engineering A, 763, 138163. https://doi.org/10.1016/j.msea.2019.138163.
DCTERMS.abstract	The mechanical properties of the Mg-based LPSO-phase are expected to be strongly affected by the microstructure due to its anisotropic crystal structure. However, the fine details have not been sufficiently understood yet. This study first clarified the detailed microstructural factors that govern the strength of the LPSO-phase by examining alloys with microstructures that were significantly varied via directional solidification and extrusion processes. Refining the microstructure is significantly effective for strengthening LPSO-phase alloys. The yield stress of LPSO-phase alloys with random texture was previously reported to be increased by reducing the “length” of plate-like LPSO-phase grains. In addition, it was found in this study that the formation stress in the deformation kink band, which is a unique deformation mode in an LPSO-phase alloy, can be increased by decreasing the “thickness” of the grains. Furthermore, the study used directionally solidified crystals provided direct evidence that the introduction of the deformation kink band effectively increases the yield stress and work-hardening rate of alloys by hindering the motion of basal dislocations. This “kink-band strengthening” was found to have considerable temperature dependence. The strengthening is significant at or below 200 °C, but the effect gradually decreases above 300 °C and is accompanied by the operation of non-basal slip. The results quantitatively clarified that kink-band strengthening is one predominant reason why the LPSO-phase extruded alloy exhibits an unusually high yield stress at any loading orientation.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89816
citation_title	Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands
citation_author	Hagihara, Koji
	Yamasaki, Michiaki
	Kawamura, Yoshihito
	Nakano, Takayoshi
citation_publisher	Elsevier
citation_language	英語
citation_date	2019-08-19
citation_journal_title	Materials Science and Engineering A
citation_volume	763
citation_firstpage	138163
citation_doi	https://doi.org/10.1016/j.msea.2019.138163
citation_public_url	https://hdl.handle.net/11094/89816

Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands

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