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

Janus, Felix; Kinoshita, Ryosuke; Li, Ruoqi; Higuchi, Kimitaka; Tochigi, Eita; Nakamura, Atsutomo; Li, Yan

doi:https://doi.org/10.1111/jace.20593

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

アクセス数:28件（2025-08-15 09:42 集計）

固定URL: https://hdl.handle.net/11094/102223

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タイトル	A nanoindentation study on the room-temperature plasticity in titanium dioxide bicrystals
著者	著者名 Janus, Felix
	著者名 Kinoshita, Ryosuke
	著者名 Li, Ruoqi
	著者名 Higuchi, Kimitaka
	NRID 1000050709483 1000050709483 著者名 Tochigi, Eita
	NRID 1000020419675 1000020419675 ORCID 0000-0002-4324-1512 0000-0002-4324-1512 researchmap permalink read0210196 read0210196 Scopus Author ID 56421164400 56421164400 著者名 Nakamura, Atsutomo
	NRID 1000070930171 1000070930171 ORCID 0000-0002-9274-2516 0000-0002-9274-2516 researchmap permalink liyan-osaka_univ liyan-osaka_univ 著者名 Li, Yan
キーワード等	grain boundaries
	hardness
	indentation
	plasticity
	titanium dioxide
内容	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.
抄録	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.
出版者	John Wiley and Sons Inc
収録物名	Journal of the American Ceramic Society
ページ	e20593
刊行年月	2025-05-21
言語	英語
ハンドルURL	https://hdl.handle.net/11094/102223
PISSN	00027820
eISSN	15512916
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1111/jace.20593
アクセス権	open access
権利情報	© 2025 The Author(s). Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.
権利情報	This article is licensed under a Creative Commons Attribution-NonCommercial 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	Journal of the American Ceramic Society. 2025, p. e20593
DC.title	A nanoindentation study on the room-temperature plasticity in titanium dioxide bicrystals
DC.creator	Janus, Felix
	Kinoshita, Ryosuke
	Li, Ruoqi
	Higuchi, Kimitaka
	Tochigi, Eita
	Nakamura, Atsutomo
	Li, Yan
DC.publisher	John Wiley and Sons Inc
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-05-21
DC.identifier	https://doi.org/10.1111/jace.20593
DC.subject	grain boundaries
	hardness
	indentation
	plasticity
	titanium dioxide
DC.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.
DCTERMS.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.
DC.rights	© 2025 The Author(s). Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.
DC.rights	This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
DC.format	102223
citation_title	A nanoindentation study on the room-temperature plasticity in titanium dioxide bicrystals
citation_author	Janus, Felix
	Kinoshita, Ryosuke
	Li, Ruoqi
	Higuchi, Kimitaka
	Tochigi, Eita
	Nakamura, Atsutomo
	Li, Yan
citation_publisher	John Wiley and Sons Inc
citation_language	英語
citation_date	2025-05-21
citation_journal_title	Journal of the American Ceramic Society
citation_firstpage	e20593
citation_doi	https://doi.org/10.1111/jace.20593
citation_public_url	https://hdl.handle.net/11094/102223

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

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