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

Number of Access:16（2026-04-09 06:38 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/104034

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Title
Low Young’s modulus achieved by anelastic relaxation arising from reversible atomic shuffling in bcc Ti–Nb alloys
Creator
NRID
1000080379099 1000080379099
ORCID
0000-0002-1478-6820 0000-0002-1478-6820
researchmap permalink
read0121157 read0121157
Scopus Author ID
6602704774 6602704774
CreatorName
Tane, Masakazu
CreatorName
Morita, Keigo
NRID
1000070880962 1000070880962
CreatorName
Miyoshi, Eisuke
CreatorName
Hiramatsu, Takumi
Subject
Atomic shuffling
Elastic properties
Phase transformation
Relaxation
Titanium alloys
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.
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.
Publisher
Acta Materialia Inc
Source Title
Acta Materialia
Volume (Issue)
307
Page
121969
Date of Issued
2026-04-01
Language
English
Handle URL
https://hdl.handle.net/11094/104034
PISSN
13596454
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.actamat.2026.121969
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open access
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This article is licensed under a Creative Commons Attribution 4.0 International License.
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Category
学術雑誌論文 Journal Article