Stability of vacancies in β-type Ti-15Mo-5Zr-3Al alloy fabricated via laser powder bed fusion

Mizuno, Masataka; Sugita, Kazuki; Do, Kousuke et al.

Additive Manufacturing Letters, 2023, 7, 100162

Number of Access:199（2025-06-12 18:33 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/93107

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Title
Stability of vacancies in β-type Ti-15Mo-5Zr-3Al alloy fabricated via laser powder bed fusion
Creator
NRID
1000050324801 1000050324801
ORCID
0000-0002-7231-4469 0000-0002-7231-4469
researchmap permalink
masataka_mizuno masataka_mizuno
Scopus Author ID
7402730540 7402730540
CreatorName
Mizuno, Masataka
NRID
1000030517470 1000030517470
CreatorName
Sugita, Kazuki
CreatorName
Do, Kousuke
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
1000030243182 1000030243182
ORCID
0000-0001-8052-1698 0000-0001-8052-1698
researchmap permalink
read0013987 read0013987
Scopus Author ID
7403896013 7403896013
CreatorName
Nakano, Takayoshi
NRID
1000020202749 1000020202749
researchmap permalink
HidekiARAKI HidekiARAKI
Scopus Author ID
7201945633 7201945633
CreatorName
Araki, Hideki
Subject
Diffusion
First-principles calculation
Laser powder bed fusion
Migration energy
Ti alloys
Vacancy formation energy
Description
Mizuno M., Sugita K., Do K., et al. Stability of vacancies in β-type Ti-15Mo-5Zr-3Al alloy fabricated via laser powder bed fusion. Additive Manufacturing Letters 7, 100162 (2023); https://doi.org/10.1016/j.addlet.2023.100162.
Abstract
The structural instability in the β-type titanium alloys could affect the stability of vacancies. The stability of vacancies in a β-type Ti-15Mo-5Zr-3Al alloy, fabricated via laser powder bed fusion (LPBF), was investigated using positron annihilation spectroscopy and first-principles calculations. The observed positron lifetimes were close to the experimental and calculated bulk lifetime of Ti-15Mo-5Zr-3Al, which indicates that vacancies were not detected in Ti-15Mo-5Zr-3Al by positron lifetime measurements. Therefore, for the first time, it has been confirmed that quenched-in vacancies are not introduced in the LPBF-manufactured β-type Ti-15Mo-5Zr-3Al despite the fast cooling rate in LPBF process. This feature is preferable for the structural stability in biomedical and industrial applications. The calculated atomic displacement from the ideal bcc lattice positions decreased in β-type Ti-Mo alloys with increasing Mo concentration, indicating that the bcc structure was stabilized by the added Mo. The calculated vacancy formation energies of Ti atoms in β-type Ti-14.5Mo and Ti-27.0Mo alloys exhibited an increasing trend with an increasing number of neighboring Mo atoms. Mo atoms also increased the migration energies of the neighboring paths of vacancies. The calculated results for Ti-15Mo-5Zr-3Al suggest that, while the bcc structure was stabilized by the Mo atoms in Ti-15Mo-5Zr-3Al, the migration and formation energies were still low enough for the diffusion of vacancies.
Publisher
Elsevier B.V.
Source Title
Additive Manufacturing Letters
Volume (Issue)
7
Page
100162
Date of Issued
2023-12-01
Language
English
Handle URL
https://hdl.handle.net/11094/93107
eISSN
27723690
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.addlet.2023.100162
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
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学術雑誌論文 Journal Article