Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure

Higashino, Shota; Miyashita, Daisuke; Ishimoto, Takuya; Miyoshi, Eisuke; Nakano, Takayoshi; Tane, Masakazu

doi:https://doi.org/10.1016/j.addma.2025.104720

Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure

Higashino, Shota; Miyashita, Daisuke; Ishimoto, Takuya et al.

Additive Manufacturing, 2025, 102, 104720

アクセス数:388件（2025-08-16 00:02 集計）

固定URL: https://hdl.handle.net/11094/100971

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タイトル	Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure
著者	NRID 1000070908095 1000070908095 著者名 Higashino, Shota
	著者名 Miyashita, Daisuke
	NRID 1000050508835 1000050508835 ORCID 0000-0003-0081-0591 0000-0003-0081-0591 researchmap permalink i_taku i_taku Scopus Author ID 35310484700 35310484700 著者名 Ishimoto, Takuya
	NRID 1000070880962 1000070880962 著者名 Miyoshi, Eisuke
	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
	NRID 1000080379099 1000080379099 ORCID 0000-0002-1478-6820 0000-0002-1478-6820 researchmap permalink read0121157 read0121157 著者名 Tane, Masakazu
キーワード等	Crystallographic texture
	Elastic properties
	Laser powder bed fusion
	Titanium alloys
	ω phase transformation
内容	Higashino S., Miyashita D., Ishimoto T., et al. Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure. Additive Manufacturing 102, 104720 (2025); https://doi.org/10.1016/j.addma.2025.104720.
抄録	Metastable β (body-centered cubic)-phase Ti alloys, quenched from a high-temperature β-phase field, have attracted great interest as biomedical implants, owing to their low Young's modulus. Recently, the application of additive manufacturing (AM) to β-phase Ti alloys has gathered much attention, because the AM process can form anisotropic crystallographic texture in which an elastically soft direction is preferentially oriented, resulting in low Young's modulus in a specific direction. However, the effects of anisotropic texture and microstructure formed by the AM process on anisotropic elastic properties have not been clarified in detail. In the present study, we measured all the independent elastic stiffness components of β-phase Ti–15Mo–5Zr–3Al (mass%) alloys, prepared by bidirectional scanning with (XY-scan) and without (X-scan) an interlayer rotation of 90° in laser powder bed fusion (LPBF), one of the AM processes, using resonant ultrasound spectroscopy. The measurements revealed that the LPBF-processed Ti alloys exhibited strong elastic anisotropy and a low Young's modulus (below 60 GPa) in the <100>-oriented direction of the alloy prepared by the XY-scan. Furthermore, micromechanics calculations based on Eshelby's inclusion theory revealed that the single crystal constituting the alloys prepared by LPBF had almost the same elastic stiffness as that of a single crystal prepared by the floating zone melting, which indicated that the metastable β phase was retained by suppressing an easily occurring β- to ω-phase transformation during LPBF. These results indicate that texture control combined with retention of the metastable β phase by LPBF achieves biocompatible low Young's modulus.
出版者	Elsevier B.V.
収録物名	Additive Manufacturing
巻(号)	102
ページ	104720
刊行年月	2025-03-25
言語	英語
ハンドルURL	https://hdl.handle.net/11094/100971
eISSN	22148604
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.addma.2025.104720
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
DCTERMS.bibliographicCitation	Additive Manufacturing. 2025, 102, p. 104720
DC.title	Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure
DC.creator	Higashino, Shota
	Miyashita, Daisuke
	Ishimoto, Takuya
	Miyoshi, Eisuke
	Nakano, Takayoshi
	Tane, Masakazu
DC.publisher	Elsevier B.V.
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-03-25
DC.identifier	https://doi.org/10.1016/j.addma.2025.104720
DC.subject	Crystallographic texture
	Elastic properties
	Laser powder bed fusion
	Titanium alloys
	ω phase transformation
DC.description	Higashino S., Miyashita D., Ishimoto T., et al. Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure. Additive Manufacturing 102, 104720 (2025); https://doi.org/10.1016/j.addma.2025.104720.
DCTERMS.abstract	Metastable β (body-centered cubic)-phase Ti alloys, quenched from a high-temperature β-phase field, have attracted great interest as biomedical implants, owing to their low Young's modulus. Recently, the application of additive manufacturing (AM) to β-phase Ti alloys has gathered much attention, because the AM process can form anisotropic crystallographic texture in which an elastically soft direction is preferentially oriented, resulting in low Young's modulus in a specific direction. However, the effects of anisotropic texture and microstructure formed by the AM process on anisotropic elastic properties have not been clarified in detail. In the present study, we measured all the independent elastic stiffness components of β-phase Ti–15Mo–5Zr–3Al (mass%) alloys, prepared by bidirectional scanning with (XY-scan) and without (X-scan) an interlayer rotation of 90° in laser powder bed fusion (LPBF), one of the AM processes, using resonant ultrasound spectroscopy. The measurements revealed that the LPBF-processed Ti alloys exhibited strong elastic anisotropy and a low Young's modulus (below 60 GPa) in the <100>-oriented direction of the alloy prepared by the XY-scan. Furthermore, micromechanics calculations based on Eshelby's inclusion theory revealed that the single crystal constituting the alloys prepared by LPBF had almost the same elastic stiffness as that of a single crystal prepared by the floating zone melting, which indicated that the metastable β phase was retained by suppressing an easily occurring β- to ω-phase transformation during LPBF. These results indicate that texture control combined with retention of the metastable β phase by LPBF achieves biocompatible low Young's modulus.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	100971
citation_title	Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure
citation_author	Higashino, Shota
	Miyashita, Daisuke
	Ishimoto, Takuya
	Miyoshi, Eisuke
	Nakano, Takayoshi
	Tane, Masakazu
citation_publisher	Elsevier B.V.
citation_language	英語
citation_date	2025-03-25
citation_journal_title	Additive Manufacturing
citation_volume	102
citation_firstpage	104720
citation_doi	https://doi.org/10.1016/j.addma.2025.104720
citation_public_url	https://hdl.handle.net/11094/100971

Low Young's modulus in laser powder bed fusion processed Ti–15Mo–5Zr–3Al alloys achieved by the control of crystallographic texture combined with the retention of low-stability bcc structure

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