研究者詳細 - 矢矧　束穂

論文 - 矢矧　束穂

件数 13 件

Deformation Behavior and Fracture Strength of Single-Crystal 4H-SiC Determined by Microcantilever Bending Tests

Yahagi, T; Ohji, T; Yamaguchi, H; Takahashi, T; Nakano, H; Iijima, M; Tatami, J

ADVANCED ENGINEERING MATERIALS 26 ( 18 ) 2024年9月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Microscopic mechanical properties of silicon nitride ceramics corroded in sulfuric acid solution

Tatami, J; Uda, M; Takahashi, T; Yahagi, T; Iijima, M; Matsui, K; Ohji, T; Nakano, H

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 44 ( 9 ) 5415 - 5421 2024年8月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Micro-scale mechanical properties of surface layer in ion-exchanged glass

Fujita Saho, Ohji Tatsuki, Yahagi Tsukaho, Iijima Motoyuki, Tatami Junichi

Journal of the American Ceramic Society 107 ( 6 ) 3666 - 3672 2024年2月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The American Ceramic Society 共著

Today, ion-exchanged or chemically strengthened glass is ubiquitously used all over the world, typically for scratch-free display cover of personal mobile phones. It has been known that the strengthening is due to developments of high compressive stress in the surface layer by its internally constrained dilation . We investigated micro-scale mechanical properties of the surface layer itself of a Na+-to-K+ ion-exchanged soda lime silicate glass, revealing that the strength of the layer increased nearly 40% by the ion-exchange with little compression effect from the interior. The fracture toughness, however, was comparable before and after the ion-exchange, indicating that the ion-exchange reduces the crack size of the fracture origin. Theoretical estimates of fracture surface energies verified the measured fracture toughness. It was presumed that the observed crack-size reduction is due to crack healing effects enhanced by the ion-exchange.

Deformation behavior and bending strength of single crystal 8 mol% yttria-stabilized zirconia at microscopic scale

Muramoto, M; Tatami, J; Iijima, M; Matsui, K; Yahagi, T; Takahashi, T; Nakano, H; Ohji, T

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 44 ( 2 ) 1061 - 1069 2024年2月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Deformation behavior and bending strength of single crystal 8 mol% yttria-stabilized zirconia at microscopic scale

Muramoto Mayuko, Tatami Junichi, Iijima Motoyuki, Matsui Kazumi, Yahagi Tsukaho, Takahashi Takuma, … 全著者表示

Journal of the European Ceramic Society 44 ( 2 ) 1061 - 1069 2023年11月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier Science Ltd. 共著

Yield phenomena and bending strength of single crystal 8YSZ were evaluated using microcantilever beam specimens with various crystal orientations. Nonlinearity due to plastic deformation was observed in the stress strain curves, and the yield stress was found to depend on the crystal orientation. TEM observation revealed many areas of disordered lattice in the region where the maximum tensile stress occurred. Resolved shear stress (RSS) was analyzed for the primary {001} and the secondary {110} and {111} slip systems as a function of the angle between the specimen's longitudinal direction and the [001] orientation, indicating that the RSS for the secondary ones was the critical RSS in the angle at 10 degrees or lower while that for the primary one did so at 20 degrees or higher. The measured bending strength, which depended on the crystal orientation, was lower than, but on the same order of magnitude as, the ideal strength.

Deformation behaviors and fracture strength of β$\ubeta$-Si3N4 single crystals

Tanabe, M; Tatami, J; Iijima, M; Yahagi, T; Takahashi, T; Nakano, H; Ohji, T

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 106 ( 9 ) 5431 - 5439 2023年9月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

A novel embedding composition for the evaluation of the internal structure of carbon materials using electron microscopy

Tsukaho Yahagi

Microscopy 72 ( 6 ) 511 - 514 2023年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

Effect of rare-earth oxide additives on transparency and fluorescence of a-SiAlON ceramics

Aminaka Kohei, Tatami Junichi, Iijima Motoyuki, Takahashi Takuma, Yahagi Tsukaho

Ceramics International 48 ( 16 ) 23195 - 23205 2022年8月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier Science Ltd. 共著

Recently, novel transparent and fluorescent materials are in demand for various optical applications such as lasers, scintillators, and solid-state lighting. alpha-SiAlON, which has excellent thermal and mechanical properties, also exhibits photoluminescence depending on the stabilized doped rare-earth ions. Its transparency and fluorescence depend on the rare-earth oxide added as a raw material, particularly in conventional powder processing. In this study, we fabricated alpha-SiAlON ceramics by adding various rare-earth oxides to elucidate their effects on the transparency and fluorescence of these ceramics. High-transparency alpha-SiAlON ceramics were fabricated by adding rare-earth oxides whose rare-earth ions have small ionic radii: Y2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, and Lu2O3. Because the fraction of alpha-SiAlON was high, the relative density was high, and the microstructure was composed of fine grains. In particular, alpha-SiAlON ceramics prepared by adding Ho2O3 showed lower light scattering than the other fabricated alpha-SiAlON ceramics because of the smaller alpha-SiAlON grains, resulting in higher in-line transmittance (48% at 600 nm). Furthermore, these transparent alpha-SiAlON ceramics exhibited fluorescence corresponding to the activated rare-earth ions: Ho3+, Er3+, Tm3+, and Yb3+ or Yb2+.

Effect of rare-earth oxide additives on transparency and fluorescence of a-SiAlON ceramics

Aminaka, K; Tatami, J; Iijima, M; Takahashi, T; Yahagi, T

CERAMICS INTERNATIONAL 48 ( 16 ) 23195 - 23205 2022年8月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Rapid Manufacturing of Complex-Structured Transparent Silica Glass Materials through a Hybridized Approach of Photo-Curing and Machining from Interparticle Photo-Cross-Linkable Suspensions

Sato, R; Yahagi, T; Tatami, J; Iijima, M

ACS APPLIED MATERIALS & INTERFACES 14 ( 14 ) 16445 - 16452 2022年4月

DOI Web of Science PubMed

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Electrical resistivity of Si3N4 ceramics with Yb2O3 additive

Yahagi, T; Kawai, D; Takahashi, T; Iijima, M; Tatami, J