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

Number of Access:23（2025-05-09 15:37 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/100971

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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
Creator	NRID 1000070908095 1000070908095 CreatorName Higashino, Shota
	CreatorName 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 CreatorName Ishimoto, Takuya
	NRID 1000070880962 1000070880962 CreatorName Miyoshi, Eisuke
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 CreatorName Nakano, Takayoshi
	NRID 1000080379099 1000080379099 ORCID 0000-0002-1478-6820 0000-0002-1478-6820 researchmap permalink read0121157 read0121157 CreatorName Tane, Masakazu
Subject	Crystallographic texture
	Elastic properties
	Laser powder bed fusion
	Titanium alloys
	ω phase transformation
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.
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.
Publisher	Elsevier B.V.
Source Title	Additive Manufacturing
Volume (Issue)	102
Page	104720
Date of Issued	2025-03-25
Language	English
Handle URL	https://hdl.handle.net/11094/100971
eISSN	22148604
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.addma.2025.104720
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
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	English
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	English
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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