論文 - 牧野 武彦
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Grain size affecting the deformation characteristics via micro-injection upsetting 査読あり 国際共著 国際誌
Walaa Abd-Elaziem, Mohsen A. Hassan, Takehiko Makino, Atef Hamada
Materials Science and Technology 37 ( 10 ) 918 - 929 2021年08月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Taylor & Francis
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Microstructure, Mechanical Properties of Extruded Aluminum at Different Ram Speeds in Micro/Meso-Scale 査読あり 国際共著 国際誌
Walaa Abdel-Aziem, Mohsen A. Hassan, Takehiko Makino, Atef Hamada
Metallography, Microstructure, and Analysis 10 402 - 409 2021年07月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Springer
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Micro/Meso-Scale Equal Channel Angular Pressing of Al 1070 Alloy: Microstructure and Mechanical Properties 査読あり 国際共著 国際誌
Walaa Abdel-Aziem, Atef Hamada, Takehiko Makino, Mohsen A. Hassan
Journal of Materials Engineering and Performance 29 6201 - 6211 2020年09月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Springer
In the present study, Al 1070 alloy pins were processed via micro/meso-scale equal channel angular pressing (channel diameter 1.5 mm, the smallest channel diameter has ever been achieved in mesoscale), up to four passes at room temperature. The microstructure characteristics, i.e., grain size, and misorientation angle distributions were analyzed by high-resolution electron backscatter diffraction on the transverse plane for the ECAPed samples. Tensile properties for such small processed pins were measured by constructed micro/meso-scale tensile machine. The gauge length and the gauge diameter were 2 mm and 1.5 mm, respectively. After the fourth ECAP pass, the results revealed that the microstructure was refined remarkably from 15.5 μm (the initial undeformed sample) to nearly 1.9 μm due to the gradual transformation of the low-angle grain boundaries into high-angle grain boundaries as a result of the occurrence of grain subdivision. Micro/meso-scale ECAP does a significant enhancement in the ultimate tensile strength by 63%, whereas the ductility decreased after the fourth ECAP pass by 47.3% and this is supposed to be ascribed to the continuous decrease in subgrain size. The above results prove that the ECAP process has the potential for obtaining fine grains and improving material tensile properties even in micro/meso-scale.
DOI： 10.1007/s11665-020-05090-4
その他リンク： https://link.springer.com/article/10.1007%2Fs11665-020-05090-4
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Microstructural evolution during extrusion of equal channel angular-pressed AA1070 alloy in micro/mesoscale 査読あり 国際共著 国際誌
Walaa Abdel-Aziem, Atef Hamada,Takehiko Makino, M. Hassan
Materials Science and Technology 36 ( 11 ) 1169 - 1177 2020年05月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Taylor & Francis
Commercially AA1070 aluminium was processed by micro/mesoscale equal channel angular pressing (ECAP) up to four passes, via route BC, to achieve fine grain structure and thereby enhancing the mechanical properties. Subsequently, the samples subjected to ECAP processing underwent an extrusion deformation in micro/mesoscale. The microstructural evolution of the deformed structures was followed using electron backscatter diffraction. The findings confirm that a remarkable refinement in the grain structure was observed as a result of the gradual transformation of the low angle grain boundaries into high angle grain boundaries through the grain subdivision mechanism. Consequently, a substantial improvement of the mechanical properties of the extruded material is promoted compared to the samples subjected to ECAP processing.
DOI： 10.1080/02670836.2020.1759485
その他リンク： https://www.tandfonline.com/doi/full/10.1080/02670836.2020.1759485
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Microstructure Evolution of AA1070 Aluminum Alloy Processed by Micro/Meso-Scale Equal Channel Angular Pressing 査読あり 国際共著 国際誌
Walaa Abdel-Aziem, Atef Hamada, Takehiko Makino, Mohsen A. Hassan
Metals and Materials International 2019年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Springer
The Micro/meso-forming of commercially pure aluminum, AA1070, processed at room temperature by equal channel angular pressing (ECAP) with a die channel angle of 90° through 4 deformation passes has been conducted. Microstructure features, such as grain size, misorientation angle distributions and the developed texture during the four deformation passes of micro/meso-ECAP have been investigated by Electron backscattering diffraction (EBSD) technique. Then, hardness measurements over the cross-section of the processed samples were correlated with the EBSD analysis. EBSD scans revealed that extended shear bands are formed and represent the microstructural feature induced during micro/meso-forming. Whereas, a non-uniform grain structure consisting of intensive low-angle grain boundaries was obtained in the first pass, a uniform ultrafine-grained structure of high-angle grain boundaries (in the range of 1–2 μm) was achieved at the fourth pass. Consequently, a significant improvement in the hardness value to 65.3%, with respect to the starting material, was achieved due to the enhancement of the fine grain structure. The texture analysis exhibited that the high plastic shear strain associated with micro/meso-scale ECAP was capable to develop a weak texture in the flow plane compared to the starting texture.
DOI： 10.1007/s12540-019-00544-4
その他リンク： https://link.springer.com/article/10.1007/s12540-019-00544-4
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Tribological effects of punch with micro-dimples in blanking under high hydrostatic pressure 査読あり 国際誌
K. Kitamura, T. Makino, M. Nawa, S. Miyata
CIRP Annals - Manufacturing Technology 65 249 - 252 2016年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Direct measurement of friction force during forming 国際誌
Takehiko Makino. Yuya Yogo, Toshinari Michimoto, Yohei Takamori
4th Asian Symposium on Materials Processing (ASMP 2015) 39 - 40 2016年03月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
Information about distribution and change in friction during forming is required to construct a prediction model. The small deflection of a thin part fabricated at the other side of a flat tool surface is detected using laser reflection to decompose the normal and horizontal (frictional) forces. The locus of laser reflection on a detector showed both components. The values estimated from the locus were fairly close to the measured forces.
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Contact potential difference measurement of adhesion process during micro/meso-scale injection upsetting (共著) 査読あり
Takehiko Makino, Toshinari Michimoto, Shinpei Moriyama, Tohru Kikuchi
Procedia Engineering 81 444 - 449 2014年11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）
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Frictional Behavior of Ball Rotation with Plastic Deformation (共著) 査読あり
Futamura, M., Ishitani, A., Makino, T. and Dohda, K.
Tribology Online 6 193 - 198 2011年03月
記述言語：英語 掲載種別：研究論文（学術雑誌）
その他リンク： http://www.jstage.jst.go.jp/article/trol/6/4/6_193/_article
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Proposal of a Ball Burnishing Method with Forced Rotation (共著) 査読あり
Futamura, M., Ishitani, A., Makino, T. and Dohda, K.
Tribology Online 6 199 - 206 2011年03月
記述言語：英語 掲載種別：研究論文（学術雑誌）
その他リンク： http://www.jstage.jst.go.jp/article/trol/6/4/6_199/_article
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An investigation on bump formation in forming of micro dimple (共著) 査読あり
Cao, J., Dohda, K., Zhou, R., Makino, T. and Futamura, M.
Steel research international 81 ( 9 ) 1160 - 1164 2010年09月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Micro-Dimple Forming for Inner Surface of Pipe (共著) 査読あり
Futamura, M., Dohda, K., Makino, T. and Suzuki, T.
Transactions of NAMRI/SME 38 515 - 522 2010年05月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Tribo-characteristic of Coated Die against Magnesium in Ironing Process (共著) 査読あり
K.Dohda, T. Makino, H. Katoh
International Journal of Material Forming 2 243 - 246 2009年08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）
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Production of Small Pin by Micro/Meso-Scale Rotary Forming (共著) 査読あり
H. Zhang, T. Makino, K. Dohda, J. Cao
Materials Science Forum 614 105 - 110 2009年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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パイプ内面のマイクロディンプル加工法の開発（共著） 査読あり
二村優, 堂田邦明, 牧野武彦, 鈴木哲哉
塑性と加工 50 ( 580 ) 434 - 438 2009年05月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Anisotropy of Plastic Deformation in Micro/meso-scale Metal Forming- Development of Testing Method - (共著) 査読あり
T. Makino, K. Dohda, A. Ishitani, H. Zhang
Transaction of NAMRI/SME 37 333 - 340 2009年05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）
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Tribology in Micro/Meso-scale Forming (共著)
K. Dohda, T. Makino
K. Dohda, T. Makino 2008年11月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Application of Thin Coating to Micro-Extrusion of Aluminum (共著)
N. Takatsuji, K. Dohda, T. Makino, T. Yoshimura
Proceedings of the 2nd International Conference on Micro-Manufacturing (2007) 57 - 62 2007年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Finite Element Polycrystal Method Analysis of Micro/Meso-Scale Ring Compression (共著)
T. Makino, K. Dohda, A. Ishitani, C. Endo
Proceedings of the 2nd International Conference on Micro-Manufacturing (2007) 207 - 212 2007年11月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Simulation of liquid/solid interfacial structures in metal/ceramics wetting systems (共著) 査読あり
T. Makino, S.-I. Tanaka
Advanced Materials Research 11-12 485 - 488 2006年11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）
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