論文 - 徳永 透子

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  • High-temperature strength and kink-band formation in mille-feuille-structured Ti/FeTi eutectic alloys 査読あり

    T. Tokunaga, T. Yonemura, K. Hagihara

    Materials Science and Engineering A   900   146505   2024年04月

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    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)  

    DOI: https://doi.org/10.1016/j.msea.2024.146505

    DOI: https://doi.org/10.1016/j.msea.2024.146505

  • New kink-band formation mechanism discovered in Zn-Al alloy with mille-feuille microstructure 査読あり 国際誌

    K. Hagihara, S. Ohsawa, T. Tokunaga

    Materials & Design   239   112767   2024年03月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.matdes.2024.112767

    DOI: https://doi.org/10.1016/j.matdes.2024.112767

  • Effect of rolling and alloying elements on the impact properties of hypereutectoid steels 査読あり

    T. Tokunaga, Y. Minamino, K. Yamamoto, T. Sugimoto, K. Hagihara

    ISIJ International   64 ( 6 )   1078 - 1088   2024年02月

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    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)  

    DOI: https://doi.org/10.2355/isijinternational.ISIJINT-2023-453

    DOI: https://doi.org/10.2355/isijinternational.ISIJINT-2023-453

  • Contributions of multimodal microstructure in the deformation behavior of extruded Mg alloys containing LPSO phase 査読あり

    K. Hagihara, T. Mayama, M. Yamasaki, S. Harjo, T. Tokunaga, K. Yamamoto, M. Sugita, K. Aoyama, W. Gong, S. Nishimoto

    International Journal of Plasticity   173   103865   2024年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.ijplas.2023.103865

    DOI: https://doi.org/10.1016/j.ijplas.2023.103865

  • Effects of cementite particles on impact properties in high-hardness hypereutectoid steels 査読あり

    T. Tokunaga, K. Yamamoto, Y. Minamino, T. Takayama, T. Sugimoto, K. Hagihara

    ISIJ International   64 ( 2 )   2024年

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    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)  

  • Kink-band formation in the directionally-solidified Mg/LPSO two-phase alloys 査読あり

    T. Tokunaga, K. Hagihara, M. Yamasaki, T. Mayama, K. Yamamoto, H. Narimoto, T. Kida, Y. Kawamura, T. Nakano

    Science and Technology of Advanced Materials   2022年10月

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    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)  

    DOI: https://doi.org/10.1080/14686996.2022.2137696

    DOI: https://doi.org/10.1080/14686996.2022.2137696

  • Microstructural factors governing the significant strengthening of Al/Al2Cu mille-feuille structured alloys accompanied by kink-band formation 査読あり 国際共著

    K. Hagihara, T. Tokunaga, S. Ohsawa, S. Uemichi, K. Guan, D. Egusa, E.Abe

    International Journal of Plasticity   158   103419   2022年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.ijplas.2022.103419

    DOI: https://doi.org/10.1016/j.ijplas.2022.103419

  • 青森県量子科学センターにおけるBNCT

    徳永透子, 八戸慎吾, 菊池洋好, 馬場豊美

    インナービジョン   36 ( 2 )   62 - 63   2021年02月

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    掲載種別:研究論文(学術雑誌)  

  • Microstructure refinement and mechanical properties improvement of Al-Si-Fe alloys by hot extrusion using a specially designed high-strain die 査読あり

    酒向志乃, 徳永透子, 大野宗一, 松浦清隆

    Journal of Materials Processing Technology   277 ( 116447 )   1 - 9   2020年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Development of High Corrosion- and Wear-Resistant Al-Si Alloy Coating on AZ80 Mg Alloy by Hot Extrusion 査読あり

    Toko Tokunaga, Kazushi Sotomoto, Munekazu Ohno, Kiyotaka Matsuura

    Journal of Materials Engineering and Performance   29   6355 - 6362   2020年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Enhancement of ductility for Al–Si–Fe alloy by refining β phase with a novel ball-die extrusion 査読あり

    徳永透子, 犬伏晴紀

    SN Applied Sciences   1 ( 10 )   1334   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/s42452-019-1377-4

    その他リンク: http://link.springer.com/article/10.1007/s42452-019-1377-4/fulltext.html

  • Microstructure evolution during superplastic deformation of an Al-coated Mg alloy sheet 査読あり

    T. Tokunaga, M. Ohno

    Journal of Alloys and Compounds   805   436 - 443   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Fabrication of Al-Coated Mg-Li Alloy Sheet and Investigation of Its Properties 査読あり

    T. L. Zhang, T. Tokunaga, M. Ohno, M. L. Zhang, K. Matsuurah

    Acta Metallurgica Sinica (English Letters)   32   169 - 177   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Microstructure evolution in superplastic Al/Mg/Al clad sheet 査読あり

    T. Tokunaga, K. Matsuura, M. Ohno

    Proceedings of 16th Inter-national Conference on Aluminum Alloys (ICAA16)   2018年

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    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)  

  • Coating on magnesium alloy with super duralumin by hot extrusion and evaluation of its surface properties 査読あり

    Toko Tokunaga, Kazushi Sotomoto, Munekazu Ohno, Kiyotaka Matsuura

    Materials Transactions   59 ( 3 )   432 - 436   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Institute of Metals (JIM)  

    The poor corrosion resistance of Mg alloys, which is well known as one of the lightest structural metal materials, limits a wide use of these alloys. In order to dramatically increase not only the corrosion resistance but also the surface hardness of Mg alloys (AZ80), coating with A2024 Al alloy by hot extrusion has been attempted in this study. The coating was successfully realized by hot extrusion of a Mg alloy (AZ80) billet together with an Al alloy plate placed between the billet and the extrusion die. The A2024 Al alloy-coated Mg alloy exhibited an excellent corrosion resistance and no weight loss was observed after immersion in a 5 mass% HCl aqueous solution for 10 min while a weight loss of about 1500 g・m−2 was observed in case of AZ80 Mg alloy without coating under the same condition. The surface hardness of the coated alloy was increased to about 85 HV by aging for 144 h at room temperature after solution treatment for 3 h at 673 K.

    DOI: 10.2320/matertrans.M2017317

  • Brazed Bonding between SiAlON and heat-resistant alloys with application of filler materials 査読あり

    Toko Tokunaga, Masayuki Koshiyama, Kazuya Kurokawa, Munekazu Ohno, Kiyotaka Matsuura

    Materials Transactions   59 ( 6 )   969 - 975   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Institute of Metals (JIM)  

    It has been required to improve the heat efficiency of thermal power generation system for the sake of mitigation of the global warming and resource depletion problems. For improving the heat efficiency, it is effective to increase the steam temperature, and as a result, appropriate heatresistant alloys are needed. Although SUS304 stainless steel and Ni-based superalloys have been proposed as promising heat-resistant alloys until now, there still remain some concerns such as high-temperature corrosion by flaming gas and erosion by combustion ash. Thus, the present authors propose SiAlON ceramic coating on SUS304 and INCONEL X-750 because SiAlON has excellent heat, wear and corrosion resistances. In the present study, brazed bonding between SiAlON and these heat-resistant alloys was attempted with the applications of Cu and Ag as a soft filler material to reduce the residual stress generated due to the difference in thermal expansion coefficient between SiAlON and the heat-resistant alloys. As for the bonding with the Cu filler, the SiAlON/Cu/SUS joint was successful when the brazing time was short. However, when the brazing time was long (for example, 60 minutes), Fe-based grains were formed in the Cu filler layer, and the cracks were formed in the SiAlON near the joint interface during cooling in the brazing process. It was considered that the Cu filler was hardened by the formation of the Fe-based grains and could not reduce the residual stress. As for the bonding with the Ag filler, on the other hand, the SiAlON/Ag/SUS joint was successful even for a long brazing time. The SiAlON/Ag/INCONEL joint was also successful. The bending strengths of these SiAlON/Cu/SUS, SiAlON/Ag/SUS and SiAlON/Ag/INCONEL joints were evaluated by a three point bending test, and the results were approximately 200, 270 and 350 MPa, respectively. In all cases fracture occurred in the SiAlON, which means that the SiAlON and the alloys were strongly bonded.

    DOI: 10.2320/matertrans.M2018038

  • Low temperature superplasticity of a dual-phase Mg-Li-Zn alloy processed by a multi-mode deformation process 査読あり

    T. L. Zhang, T. Tokunaga, M. Ohno, R. Z. Wu, M. L. Zhang

    Materials Science & Engineering A   737   61 - 68   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • 熱間押出法を用いた炭素繊維一方向配向Cu基複合材料の作製と熱伝導特性評価 査読あり

    紺谷博人, 徳永透子, 大野宗一, 佐々木克彦, 松浦清隆

    日本金属学会誌   82 ( 5 )   125 - 129   2018年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.J2017047

  • Coatings on Mg alloys and their mechanical properties (review) 査読あり

    T. Tokunaga, M. Ohno, K. Matsuura

    Journal of Materials Science and Technology   34 ( 7 )   1119 - 1126   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • 熱間押出法によるマグネシウム合金の超ジュラルミン被覆 と表面特性の評価 査読あり

    德永透子, 外本和嗣, 大野宗一, 松浦清隆

    日本金属学会誌   81 ( 8 )   389 - 393   2017年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.J2017019

  • SiAlONと耐熱合金のろう付け接合 査読あり

    徳永透子, 越山将行, 黒川一哉, 大野宗一, 松浦清隆

    日本金属学会誌   81 ( 3 )   143 - 149   2017年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.J2016056

  • Fabrication of Carbon Fiber Oriented Al–Based Composites by Hot Extrusion and Evaluation of Their Thermal Conductivity 査読あり

    徳永 透子

    Materials Transactions   58 ( 6 )   938 - 944   2017年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/matertrans.M2016426

  • Fabrication of Al-coated Mg alloy sheet and investigation of its mechanical properties 査読あり

    T. Tokunaga, M. Ohno, K. Matsuura

    Journal of Functionally Graded Materials   30   1 - 4   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Grain Refinement and Ductility Improvement by Hot Extrusion Using a Heteromorphic Die with Small Holes 査読あり

    Kaho Tomita, Toko Tokunaga, Munekazu Ohno, Kiyotaka Matsuura

    MATERIALS TRANSACTIONS   57 ( 6 )   927 - 934   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN INST METALS  

    It has been shown using an Al-4.0mass% Cu alloy as a demonstration material that hot extrusion with the use of a specially-designed die leads to grain refinement and improvement in ductility. The specially-designed die is called in this study the heteromorphic die and it consists of two plates and one spacer. One plate is called the strain-giving die and has six small round holes of 5 mm in diameter, while the other plate is called the shape-giving die and has one big rectangular hole of 9 mm x 15 mm. The spacer separates these two plates at a distance of 10 mm and provides a space between them. The Al-Cu alloy billet was hot-extruded through the six small round holes of the strain-giving die to produce six thin round rods, and after filling the space between the two dies, the six rods passed together through the shape-giving die to form a thick rectangular bar or plate. Tensile tests of the plate were conducted at room temperature, and the results were compared with those of the un-extruded billet and the extruded plate produced by conventional hot extrusion method, that uses only the shape-giving die. The elongation values of the three different tensile specimens produced from (1) the un-extruded billet, (2) the plate extruded by the conventional method and (3) the plate extruded with the heteromorphic die were 21, 35 and 57%, respectively. Most significant elongation was found in the sample extruded with the heteromorphic die, which is most probably due to the finest grain structure observed in this sample. It is suggested that the recrystallization is induced by a large strain generated in the heteromorphic die due to the friction on the large contact area between the extruded metal and the die orifice wall of the strain-giving die."

    DOI: 10.2320/matertrans.M2016005

  • Al被覆Mg合金薄板材の作製およびその機械的性質の調査 査読あり

    徳永透子, 大野宗一, 松浦清隆

    Journal of Functionally Graded Materials   30   1 - 4   2016年

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    掲載種別:研究論文(学術雑誌)  

  • 熱間押出法による炭素繊維配向制御Al基複合材料の作製およびその熱伝導率評価 査読あり

    徳永透子, 高橋晃一, 大野宗一, 佐々木克彦, 今西輝光, 松浦清隆

    日本金属学会誌   80 ( 10 )   640 - 645   2016年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.J2016028

  • Sensitivity analysis for thickness uniformity of Al coating layer in extrusion of Mg/Al clad bar 査読あり

    Toko Tokunaga, Danuta Szeliga, Kiyotaka Matsuura, Munekazu Ohno, Maciej Pietrzyk

    INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY   80 ( 1-4 )   507 - 513   2015年09月

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    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 LONDON LTD  

    Although Mg alloys possess many attractive properties, the use of Mg alloys has been limited due to their extremely poor corrosion resistance. In the authors' previous study, they have developed a new process for Mg/Al cladding by hot extrusion with a convex die. In the extrusion process, it was found that the thickness uniformity of the Al coating layer can be controlled by changing the die angle. However, the optimal condition of the extrusion and the influences of extrusion parameters on the coating thickness uniformity remain unclear. In this study, therefore, the sensitivity analysis has been performed in order to evaluate the influences of extrusion parameters on the coating thickness uniformity. The sensitivities of the following five parameters were evaluated: (1) initial thickness of the coating material plate, (2) extrusion temperature, (3) ram speed, (4) die angle, and (5) ratio of simulated flow stress to the experimental one for pure Al. In order to perform the sensitivity analysis, the process for Mg/Al cladding was modeled. The results from the extrusion model fairly agree with the experimental results. Thus, it can be said that the present model of Mg/Al cladding process is reliable. From the sensitivity analysis, it was found that the initial thickness of the coating material plate and die angle influence on the uniformity most. The extrusion temperature, ram speed, and flow stress ratio do not have significant influences.

    DOI: 10.1007/s00170-015-7019-0

  • 多穴ダイスを組み合わせた異形ダイスによる熱間押出材の結晶粒微細化と高延性化 査読あり

    富田花帆, 徳永透子, 大野宗一, 松浦清隆

    日本金属学会誌   79 ( 4 )   183 - 190   2015年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.J2014052

  • 芯のある研究者を目指して

    徳永透子

    まてりあ   54 ( 12 )   639   2015年

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    掲載種別:研究論文(学術雑誌)  

  • Physical and numerical modelling of backward extrusion of Mg alloy with Al coating 査読あり

    Lukasz Madej, Toko Tokunaga, Kiyotaka Matsuura, Munekazu Ohno, Maciej Pietrzyk

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   64 ( 1 )   253 - 256   2015年

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    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 BV  

    Although Mg alloys possess many attractive properties, their use has been limited due to their poor corrosion resistance. Therefore, in the present paper a process for Al coating on Mg alloys by hot extrusion was investigated. Physical simulations confirmed capabilities of this process and Al coating on a Mg alloy was obtained. Prediction of microstructure evolution and determination of optimal process parameters were the objectives of the present numerical simulations. Cellular automata were used to reach the former goal, while for the latter goal optimization analysis was applied to find the best technological parameters. (C) 2015 CIRP.

    DOI: 10.1016/j.cirp.2015.04.085

  • DUCTILITY IMPROVEMENT OF AL ALLOYS BY HETEROMORPHIC DIE EXTRUSION 査読あり

    Kiyotaka Matsuura, Toko Tokunaga, Munekazu Ohno, Kaho Tomita

    M2D2015: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON MECHANICS AND MATERIALS IN DESIGN   2063 - 2064   2015年

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    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)   出版者・発行元:INEGI-FEUP  

    It has been shown that hot extrusion with the use of a specially-designed die, which is called a heteromorphic die, leads to improvement in ductility of Al alloys. The heteromorphic die consists of two plates and one spacer. One plate is called a strain-giving die and has six holes of 5 mm in diameter, while the other plate is called a shape-giving die and has one rectangular hole of 9 mmx15 mm in side length. The spacer separates these plates at a distance of 10 mm and gives a space between them. The Al alloy billet was hot-extruded from the strain-giving die into the space between the two dies to produce six thin bars, and all the six bars passed together through the shape-giving die to become a thick rectangular bar. The rectangular bar produced by the present extrusion was tensile-tested at room temperature and the results were compared with those of the un-extruded billet and the bar produced by a conventional hot extrusion using only the shape-giving die. The elongations of the specimens made of the billet, the bar extruded by the conventional method and the one extruded using the present heteromorphic die were 21, 35 and 57 %, respectively. The largest elongation found in the sample extruded using the present heteromorphic die should be due to the fine recrystallized grain structure in that sample. It is suggested that the recrystallization is induced by a large strain generated in the present heteromorphic die due to the friction at the large contact area between the die hole wall and the alloy.

  • SPARK PLASMA SINTERING OF alpha- AND beta-SiAlON 査読あり

    Kiyotaka Matsuura, Toko Tokunaga

    M2D2015: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON MECHANICS AND MATERIALS IN DESIGN   803 - 804   2015年

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    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)   出版者・発行元:INEGI-FEUP  

    Combustion-synthesized Y-alpha-SiAlON and Ca-alpha-SiAlON powders have been consolidated by Spark Plasma Sintering (SPS) at 1300-1450 degrees C for 10min, and the mechanical properties of the consolidated bulk samples were investigated. XRD analysis revealed that alpha-SiAlON partially transforms into beta-SiAlON during the SPS and a bulk of alpha/beta-SiAlON mixture was obtained. The fraction of beta-SiAlON increases with the increase in sintering temperature and the alpha to beta transformation ratio is high for Y-alpha-SiAlON compared with Ca-alpha-SiAlON. The hardness of the consolidated bulk increases with sintering temperature and after reaching the peak at 1350 degrees C the hardness gradually decreases with temperature in both the cases of Y-alpha-SiAlON and Ca-alpha-SiAlON. The increase in hardness with temperature arises from increase in density of the sintered body, while the decrease in hardness results from grain growth due to high temperatures. The fracture toughness monotonically increases with temperature and does not show a peak for both SiAlONs, although Y-alpha-SiAlON always exhibits higher toughness than Ca-alpha-SiAlON. The higher toughness of the Y-alpha-SiAlON is attributable to its higher fraction of transformed beta-SiAlON, because the elongated shape of beta-SiAlON leads to prevention of crack propagation.

  • Superplastic behavior of Al-coated Mg alloy sheet 査読あり

    Toko Tokunaga, Kiyotaka Matsuura, Munekazu Ohno

    JOURNAL OF ALLOYS AND COMPOUNDS   601   179 - 185   2014年07月

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    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 SA  

    An Al-coated Mg alloy sheet is fabricated by hot forging an Al-coated Mg alloy plate produced by hot extrusion of a Mg alloy billet together with an Al plate. The sheet consists of recrystallized fine grains both in the Mg alloy substrate and Al coating layer. A thin intermetallic compound layer of Al3Mg2 formed at the Al/Mg interface in the hot-extruded plate. The subsequent hot forging reduces the thickness of the intermetallic layer but induces cracks in the intermetallic compound. This sheet exhibits a large tensile elongation of 550% at 573 K and at a strain rate of 1.0 x 10 (3)s (1). Notably, a tensile test of an Al specimen exhibited only 40% elongation, while that of a Mg alloy specimen exhibited 800% elongation. It is suggested that the large elongation of Al as the coating layer on the Mg alloy is attributable to the good bonding of the Al coating layer and the Mg alloy substrate. The cracks in the intermetallic layer disappear during the tensile tests at elevated temperatures and no cracks are observed in the elongated specimens, which indicates growth of the intermetallic and reparation of the cracks occurred during the low strain-rate hot deformation of the Al-coated Mg alloy sheet. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2014.02.099

  • Determination of the flow stress model of AZ80 Mg alloy 査読あり

    Toko Tokunaga, Roman Kuziak, Kiyotaka Matsuura

    Computer Methods in Materials Science   14   123 - 130   2014年

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    掲載種別:研究論文(学術雑誌)  

  • Corrosion resistance and tensile property of Al-coated Mg-Li alloy produced by hot extrusion 査読あり

    Kaho Tomita, Kiyotaka Matsuura, Munekazu Ohno, Toko Tokunaga, Ruizhi Wu, Milin Zhang

    Key Engineering Materials   641   69 - 80   2014年

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    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)   出版者・発行元:Trans Tech Publications Ltd  

    Al-coated Mg-Li alloy rods and plates having a homogeneous coating layer of 180μm in thickness have been produced by hot extrusion of Mg-Li alloy billets together with Al disks. The Al-coated Mg-Li alloy exhibits an excellent corrosion resistance in a weight-loss test with a 0.5 mass% HCl aqueous solution, and it has been revealed by a potentiometric corrosion test with a 3 mass% NaCl aqueous solution that the Al-coated Mg-Li alloy has the same electric potential as that of pure Al. Al-coated Mg-Li alloy sheets produced by hot forging of the extruded plates exhibits good elongation of 22 %, 40 % and 130 % at room temperature, 200 °C and 300 °C, respectively.

    DOI: 10.4028/www.scientific.net/KEM.641.69

  • Aluminum Coating on Magnesium-Based Alloy by Hot Extrusion and Its Characteristics 査読あり

    Toko Tokunaga, Kiyotaka Matsuura, Munekazu Ohno

    Mater. Trans.   Vol. 53 ( No.6 )   1034 - 1041   2012年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/matertrans.M2012026

  • 熱間押出法によるマグネシウム合金のアルミニウム被覆とその材質調査 査読あり

    徳永透子, 松浦清隆, 大野宗一

    日本金属学会誌   75 ( 11 )   633 - 639   2011年11月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2320/jinstmet.75.633

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