| フルテキストURL | fulltext20230619-08.pdf |
|---|---|
| 著者 | Okamoto, Yasuhiro| Shinonaga, Togo| Takemoto, Yoshito| Okada, Akira| Ochi, Akihiro| Kishimoto, Ryuya| Pityana, Sisa| Arthur, Nana| Omoniyi, Peter| Mahamood, Rasheedat| Maina, Martin| Akinlabi, Esther| |
| キーワード | Ti6Al4V Joint characteristics Laser welding Butt welding Additive manufacturing |
| 備考 | The version of record of this article, first published in Welding in the World, is available online at Publisher’s website: http://dx.doi.org/10.1007/s40194-023-01533-3| |
| 発行日 | 2023-06-08 |
| 出版物タイトル | Welding in the World |
| 巻 | 67巻 |
| 号 | 8号 |
| 出版者 | Springer Science and Business Media LLC |
| 開始ページ | 1997 |
| 終了ページ | 2005 |
| ISSN | 0043-2288 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 著作権者 | © The Author(s) 2023 |
| 論文のバージョン | publisher |
| DOI | 10.1007/s40194-023-01533-3 |
| Web of Science KeyUT | 001003110900002 |
| 関連URL | isVersionOf https://doi.org/10.1007/s40194-023-01533-3 |
| タイトル（別表記） | Formation Mechanism of Tempering-Induced Martensite in Ti-10Mo-7Al Alloy |
|---|---|
| フルテキストURL | fulltext20211224-2.pdf |
| 著者 | 竹元 嘉利| 安野 実希子| 池本 雅基| 安藤 寛幸| 清水 一郎| |
| キーワード | α''–martensite thermal stress tempering in situ observation reverse transformation |
| 備考 | 出典：竹元 嘉利, 安野 実希子, 池本 雅基, 安藤 寛幸, 清水 一郎, Ti-10Mo-7Al合金の焼戻し誘起マルテンサイトの形成機構, 日本金属学会誌, 2021, 85 巻, 11 号, p. 405-412, https://doi.org/10.2320/jinstmet.J2021027| |
| 発行日 | 2021-11-1 |
| 出版物タイトル | 日本金属学会誌 |
| 巻 | 85巻 |
| 号 | 11号 |
| 出版者 | Japan Institute of Metals |
| 開始ページ | 405 |
| 終了ページ | 412 |
| ISSN | 0021-4876 |
| NCID | AN00062446 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 著作権者 | © 2021 The Japan Institute of Metals and Materials |
| 論文のバージョン | publisher |
| DOI | 10.2320/jinstmet.j2021027 |
| 関連URL | isVersionOf https://doi.org/10.2320/jinstmet.j2021027 |
| フルテキストURL | fulltext.pdf |
|---|---|
| 著者 | Muraoka, Yuji| Yoshii, Fumiya| Fukuda, Takahiro| Manabe, Yuji| Yasuno, Mikiko| Takemoto, Yoshito| Terashima, Kensei| Wakita, Takanori| Yokoya, Takayoshi| |
| キーワード | Strain effect Spinodal decomposition Titanium dioxide Vanadium dioxide Thin films Interdiffusion Nanostructure Pulsed laser deposition |
| 備考 | © 2020 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 License. http://creativecommons.org/licenses/by-nc-nd/4.0/. This is the accepted manuscript version. The formal published version is available at [https://doi.org/10.1016/j.tsf.2020.137854] .| |
| 発行日 | 2020-03 |
| 出版物タイトル | Thin Solid Films |
| 巻 | 698巻 |
| 出版者 | Elsevier |
| 開始ページ | 137854 |
| ISSN | 0040-6090 |
| NCID | AA00863068 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 論文のバージョン | author |
| NAID | 120007193924 |
| DOI | 10.1016/j.tsf.2020.137854 |
| Web of Science KeyUT | 000521128800021 |
| 関連URL | isVersionOf https://doi.org/10.1016/j.tsf.2020.137854 |
| JaLCDOI | 10.18926/19648 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_33_2_1.pdf |
| 著者 | Omura, Yasuhiro| 飛田 守孝| 榊原 精| 竹元 嘉利| |
| 抄録 | Molecular dynamics simulation of nickel crystal under uniaxial tensile and compressive deformation was performed for single nenocrystal model and twinned nanocrystal model composed of 1550 atoms using EAM (embedded atom method) potential with the object of investigating deformation induced phase tranformation (especially twin deformation). In the case of single nanocrystal model, the evolution and development of twin deformation, (111)[11(2)], is observed under compressive loading in [001] direction, whereas either slip or twin deformation is not recognized under tensile loading. In the case of twinned nanocrystal model, twin, (111)[11(2)], decreases and disappears under tensile loading, and develops under compressive loading, It is suggested from the difference of results between single nanocrystal model and twinned nanocrystal model that it is easy for twin to induce local deformation. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1999-04-27 |
| 巻 | 33巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 8 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002309020 |
| JaLCDOI | 10.18926/19589 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_31_2_11.pdf |
| 著者 | Ishii Kouta| 竹元 嘉利| 飛田 守孝| |
| 抄録 | Fine particles of Ti-V alloy were prepared by means of arc method and were investigated on internal structure and phase transformation using HR-TEM and EDS. Martensite phase was observed in a particle containing comparatively low concentration of V, and ω phase was also found to exist in a nearly 15% V particle. The structure of the ω phase in the fine particle is remarkably expanded in comparison with the bulk sample, and the ω phase is unstable, so that it has disappeared in a few seconds during TEM observation. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1997-03-28 |
| 巻 | 31巻 |
| 号 | 2号 |
| 開始ページ | 11 |
| 終了ページ | 20 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002309004 |
| JaLCDOI | 10.18926/19588 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_31_2_1.pdf |
| 著者 | Arisawa Hideaki| Song Zhi-Yi| 竹元 嘉利| 飛田 守孝| |
| 抄録 | The microstructure of oxidizing magnesium at elevated temperatures has been studied using HR-TEM, SEM and EDS. Two kinds of thin magnesium specimen for TEM observation were prepared. One was oxidized after preparing TEM foil of magnesium, the other was prepared from an oxidized bulk magnesium for observing the cross-section of oxide/Mg interfacial region. In the former, several oxides(MgO) morphologies were observed depending on the temperature and time of the oxidization. The growth of needle-like oxides formed at 573K and mottled oxides formed at 773K were recognized as a remarkable phenomenon belonging to the local oxidization. These oxides were composed of poly-crystal. The thin uniform oxidization layer was also observed in all conditions. In the cross-sectional observation, the local oxide layer, nearly 300nm in thickness, on the matrix(Mg) were observed. The thin uniform oxidized layer of bulk samples was identified as a kind of modified layer (~40nm in thickness) in which the formation of HR-TEM lattice fringes were prevented by the strain due to the slight oxidization. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1997-03-28 |
| 巻 | 31巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 10 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002309082 |
| JaLCDOI | 10.18926/15837 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_2_1.pdf |
| 著者 | Takemoto Yoshito| Hida Moritaka| |
| 抄録 | We investigated the effects of resolved interstitial oxygen or nitrogen atoms and of quenched-in strain on the hardening of the single crystals grown from molten Ti-14 and 20wt pct Mo alloys. The aging treatment at 623K in atmosphere much more increased in the hardness of specimen surface than that in argon atmosphere. The quenched-in compressive stress enhanced age hardening due to omega formation. We surveyed in detail the hardness changes toward the center of plate-shaped single crystal. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1987-03-05 |
| 巻 | 21巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 7 |
| ISSN | 0475-0071 |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 120002307640 |
| JaLCDOI | 10.18926/15500 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_25_2_1.pdf |
| 著者 | Okada, Hiroyuki| 飛田 守孝| 榊原 精| 竹元 嘉利| |
| 抄録 | Tensile strength and elongation of cast magnesium reinforced with titanium fiber were measured by tensile test. The pull-out test of a titanium rod partially embedded in a magnesium matrix was performed to evaluate interfacial bonding strength between magnesium and titanium. It was found that when the fiber volume fraction was changed from 1% to 14%, the tensile strength was improved with increase of volume fraction, while the improvement of elongation tended to be restrained beyond the volume fraction of 10%. The interfacial strength was revealed to be strong, and this was substantiated by the scanning electron microscopy showing an excellent wettability between the titanium fiber and the magnesium matrix. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1991-03-28 |
| 巻 | 25巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 8 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307559 |
| JaLCDOI | 10.18926/15489 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_2_1.pdf |
| 著者 | Umemoto, Masayuki| 竹元 嘉利| 榊原 精| 飛田 守孝| |
| 抄録 | Fine particles of Ti-Mo alloy were prepared by evaporation. When Ti-40at % Mo alloy was evaporated on tungsten filament, fine particles of Ti contaminated with W were obtained. These particles were polyhedron in shape and 10～250nm in diameter. Average diameter and size distribution increased with pressure of argon gas (100～600 Torr). When pure Ti was placed on the Mo filament and evaporated from melt down of heated Mo filament in helium gas, fine particles of pure Ti and of Ti-Mo alloy were obtained. In this case, Ti particles were of indeterminate form and of several tens nm in diameter, and their diffraction pattern was of common α-Ti. On the other hand, composition of the Ti-Mo particles was determined to be 18at % Mo by an analysis of EDX. Structure of Ti-Mo particles could not be determined because their diameters were more than 600nm. The temperature of Mo filament, for the most part, was about 1800℃, and there pure Ti particles were produced. The temperature of the fused part of the filament was locally higher than 2600℃, and there Ti-Mo particles were produced. Fine structures of contact region among some Ti particles were observed with HRTEM. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1990-03-29 |
| 巻 | 24巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 9 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307765 |
| JaLCDOI | 10.18926/15453 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_13.pdf |
| 著者 | Kusumoto, Hisao| 飛田 守孝| 榊原 精| Nishida, Norihide| 竹元 嘉利| 山田 益男| |
| 抄録 | The strain in Si substrate induced by locally ion-plated thin film of TiN was observed by X-ray topograph (Lang technique). Circular TiN film was deposited on one side of the Si surface. In all topographs the highest blackness attributed to kinematical diffraction effect occurred at the film edge. Rosette pattern with four-lobes was observed around the film. Blackness as a whole increased with the film thickness. Strain was observed in the depth direction of substrate by limited projection method. When the slit width was narrowed, the kinematical images disappeared, and white images appeared at the film edge. All the contrast disappeared when the TiN film was completely removed in boiling HNO(3). The strain induced by the film deposition was proved to be elastic. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 13 |
| 終了ページ | 20 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307150 |
| JaLCDOI | 10.18926/15448 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_1.pdf |
| 著者 | 竹元 嘉利| 榊原 精| 飛田 守孝| |
| 抄録 | Fine particles of Ti-Mo alloy have been prepared by means of arc method, and investigated on internal structure and phase transformation using HR-TEM and EDS. Martensite phase was observed in a particle containing comparatively low concentration of Mo, and ω phase was also found to exist in a nearly 14 % M0 particle. The structure of the ω phase in the fine particle is expanded and remarkably unstable in comparison with the bulk sample, so that it has disappeared in a few seconds during TEM observation. Moreover, the β structure of Ti-Mo particles has changed to the unusual fcc phase with irradiation of a strong electron beam. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 7 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307644 |
| JaLCDOI | 10.18926/15397 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_1.pdf |
| 著者 | 竹元 嘉利| 飛田 守孝| 榊原 精| |
| 抄録 | The mechanism of brittle fracture in Ti-14mass % Mo alloy aged for 1x10(6)s at 623K was studied using transmission electron microscopy (TEM) and dynamic hardness test (DHT) on the structure deformed by means of tensile elongation at elevated temperature or cold rolling. Many band products were observed by TEM in either deformed specimens. These band products were identified to neither slips nor twinning bands, moreover, they were different from α , α ' and α " phases. The band product consisted of β phase and granular unknown phase which was transformed by deformation from ω phase. The newly discovered phase, named β" phase, in the band products had a body-centered triclinic structure. The β" was similar to the ω zone with respect to the morphology and the concentration of Mo, but it resembled β in structure. The result of DHT on the band products and the matrix showed that the band products were softer than the matrix. It is suggested that the band products are easily deformed because of the disappearance of obstacles such as ω phase, and consequently behave like paths to lead cracks preferentially. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 7 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307225 |
| 著者 | 竹元 嘉利| |
|---|---|
| 発行日 | 1997-09-30 |
| 出版物タイトル | |
| 資料タイプ | 学位論文 |