A nanoindentation study on the room-temperature plasticity in titanium dioxide bicrystals

Janus, Felix; Kinoshita, Ryosuke; Li, Ruoqi et al.

Journal of the American Ceramic Society, 2025, e20593

Number of Access:76（2025-10-29 08:05 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/102223

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Title
A nanoindentation study on the room-temperature plasticity in titanium dioxide bicrystals
Creator
CreatorName
Janus, Felix
CreatorName
Kinoshita, Ryosuke
CreatorName
Li, Ruoqi
CreatorName
Higuchi, Kimitaka
NRID
1000050709483 1000050709483
CreatorName
Tochigi, Eita
NRID
1000020419675 1000020419675
ORCID
0000-0002-4324-1512 0000-0002-4324-1512
researchmap permalink
read0210196 read0210196
Scopus Author ID
56421164400 56421164400
CreatorName
Nakamura, Atsutomo
NRID
1000070930171 1000070930171
ORCID
0000-0002-9274-2516 0000-0002-9274-2516
researchmap permalink
liyan-osaka_univ liyan-osaka_univ
CreatorName
Li, Yan
Subject
grain boundaries
hardness
indentation
plasticity
titanium dioxide
Description
Janus F., Kinoshita R., Li R., et al. A nanoindentation study on the room-temperature plasticity in titanium dioxide bicrystals. Journal of the American Ceramic Society, e20593 (2025); https://doi.org/10.1111/jace.20593.
Abstract
The increasing demand for manufacturing, processing, and utilizing ceramic materials necessitates a deeper understanding of their mechanical properties, particularly plasticity. In this study, the nanoindentation responses of rutile titanium dioxide (TiO2 ) were investigated using bicrystal samples. Two types of TiO 2 bicrystals with symmetric 10◦ tilt grain boundaries were fabricated by diffusion bonding: one with a (001) tilt grain boundary around the [110] rotation axis, and the other with a (010) tilt grain boundary around the [001] rotation axis. High-resolution transmission electron microscopy observations showed that both bicrystals contained a low-angle grain boundary composed of periodic dislocations. Nanoindentation experiments were conducted in the single-crystal regions to characterize the mechanical properties of rutile TiO 2 , as well as near the grain boundary to evaluate its influence on hardness. Nanoindentation results from the single-crystal regions showed that the (001) plane exhibited significantly higher hardness and elastic modulus than the {110} and (100) planes, indicating the anisotropic mechanical behavior of TiO2 . The (010) and (100) planes are two equivalent crystallographic planes in rutile TiO2 , but the (001) plane differs from them. Scanning probe microscopy revealed clear slip traces near the indents without accompanying cracks, indicating that nanoindentation at 5 mN achieved dislocation-mediated plasticity in rutile TiO2 at room temperature. For nanoindentations on the {110} and (001) planes, plastic deformation was governed by the {101}<10̄ 1> slip system, while the (100)[010] slip system dominated the plasticity for nanoindentations on the (100) plane. Nanoindentation experiments near grain boundaries revealed a pronounced hardness peak at the (001) grain boundary, whereas a minor hardening effect was observed at the (010) grain boundary. These findings provide new insights into the room-temperature plasticity, mechanical anisotropy, and grain boundary hardening effects in rutile crystals.
Publisher
John Wiley and Sons Inc
Source Title
Journal of the American Ceramic Society
Page
e20593
Date of Issued
2025-05-21
Language
English
Handle URL
https://hdl.handle.net/11094/102223
PISSN
00027820
eISSN
15512916
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1111/jace.20593
Access Rights
open access
CopyRight
© 2025 The Author(s). Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.
This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article