Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys

Tane, Masakazu; Morita, Keigo; Miyoshi, Eisuke; Hiramatsu, Takumi

doi:https://doi.org/10.1016/j.actamat.2026.121969

Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys

Tane, Masakazu; Morita, Keigo; Miyoshi, Eisuke et al.

Acta Materialia, 2026, 307, 121969

アクセス数:46件（2026-05-25 04:35 集計）

固定URL: https://hdl.handle.net/11094/104034

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タイトル	Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys
著者	NRID 1000080379099 1000080379099 ORCID 0000-0002-1478-6820 0000-0002-1478-6820 researchmap permalink read0121157 read0121157 Scopus Author ID 6602704774 6602704774 著者名 Tane, Masakazu
	著者名 Morita, Keigo
	NRID 1000070880962 1000070880962 著者名 Miyoshi, Eisuke
	著者名 Hiramatsu, Takumi
キーワード等	Atomic shuffling
	Elastic properties
	Phase transformation
	Relaxation
	Titanium alloys
内容	Tane M., Morita K., Miyoshi E., et al. Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys. Acta Materialia 307, 121969 (2026); https://doi.org/10.1016/j.actamat.2026.121969.
抄録	Metastable body-centered cubic (bcc) Ti alloys are attractive biomedical implant materials because they exhibit a low elastic modulus which helps mitigate bone degradation. The low elastic modulus in these alloys is believed to be correlated with a low-stability bcc structure. However, the physical nature of this correlation remains unclear. In this study, we show that the low elastic modulus of bcc Ti–Nb alloys originates from the anelastic relaxation driven by reversible atomic shuffling events that act as precursors to the ω (hexagonal) and α′′ (orthorhombic) martensitic transformations. A combination of molecular-dynamics simulations and measurements of Young’s modulus and internal friction revealed that the reversible atomic shuffling events have a low average activation energy of 0.20 eV, leading to significant anelastic relaxation even at room temperature (∼300 K), thereby lowering the elastic modulus. The reversible atomic shuffling events occur in sub-nanometer-scale, low-stability bcc regions that are depleted in the bcc-stabilizing element Nb. These regions originate from quenched-in statistical compositional fluctuations, which exist even when the constitutive elements are randomly distributed. Thus, controlling the reversible atomic shuffling events by manipulating the compositional fluctuations and the resultant local chemical composition is an effective strategy for lowering the elastic modulus of biomedical bcc Ti alloys.
出版者	Acta Materialia Inc
収録物名	Acta Materialia
巻(号)	307
ページ	121969
刊行年月	2026-04-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/104034
PISSN	13596454
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.actamat.2026.121969
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. 2026, 307, p. 121969
DC.title	Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys
DC.creator	Tane, Masakazu
	Morita, Keigo
	Miyoshi, Eisuke
	Hiramatsu, Takumi
DC.publisher	Acta Materialia Inc
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2026-04-01
DC.identifier	https://doi.org/10.1016/j.actamat.2026.121969
DC.subject	Atomic shuffling
	Elastic properties
	Phase transformation
	Relaxation
	Titanium alloys
DC.description	Tane M., Morita K., Miyoshi E., et al. Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys. Acta Materialia 307, 121969 (2026); https://doi.org/10.1016/j.actamat.2026.121969.
DCTERMS.abstract	Metastable body-centered cubic (bcc) Ti alloys are attractive biomedical implant materials because they exhibit a low elastic modulus which helps mitigate bone degradation. The low elastic modulus in these alloys is believed to be correlated with a low-stability bcc structure. However, the physical nature of this correlation remains unclear. In this study, we show that the low elastic modulus of bcc Ti–Nb alloys originates from the anelastic relaxation driven by reversible atomic shuffling events that act as precursors to the ω (hexagonal) and α′′ (orthorhombic) martensitic transformations. A combination of molecular-dynamics simulations and measurements of Young’s modulus and internal friction revealed that the reversible atomic shuffling events have a low average activation energy of 0.20 eV, leading to significant anelastic relaxation even at room temperature (∼300 K), thereby lowering the elastic modulus. The reversible atomic shuffling events occur in sub-nanometer-scale, low-stability bcc regions that are depleted in the bcc-stabilizing element Nb. These regions originate from quenched-in statistical compositional fluctuations, which exist even when the constitutive elements are randomly distributed. Thus, controlling the reversible atomic shuffling events by manipulating the compositional fluctuations and the resultant local chemical composition is an effective strategy for lowering the elastic modulus of biomedical bcc Ti alloys.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	104034
citation_title	Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys
citation_author	Tane, Masakazu
	Morita, Keigo
	Miyoshi, Eisuke
	Hiramatsu, Takumi
citation_publisher	Acta Materialia Inc
citation_language	英語
citation_date	2026-04-01
citation_journal_title	Acta Materialia
citation_volume	307
citation_firstpage	121969
citation_doi	https://doi.org/10.1016/j.actamat.2026.121969
citation_public_url	https://hdl.handle.net/11094/104034

Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys

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