固溶強化と結晶粒微細化強化を併用した析出強化トリプル超ジュラルミンの開発

• Project/Area Number: 16J07050
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Kyushu University
• Principal Investigator: 増田 高大 九州大学, 工学府, 特別研究員(PD)
• Project Period (FY): 2016-04-22 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,400,000 (Direct Cost: ¥3,400,000); Fiscal Year 2018: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2017: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2016: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: 巨大ひずみ加工 / アルミニウム合金 / 結晶粒微細化 / 高強度

Outline of Annual Research Achievements

前年度までの研究で、A2024合金に高圧ねじり(High-Pressure Torsion)加工を利用し、本研究の目標である1 GPaの引張強度を達成した。さらにその微細構造を高分解能電子顕微鏡や3次元アトムプローブ分析により解析し、主要添加元素であるCuおよびMgが小角粒界を含めた結晶粒界上に偏析することを明らかにした。
本年度は、このような観察結果をもとに1 GPaの引張強度の定量性について金属材料の強化メカニズムから評価した。一般に大角粒界は転位の運動を妨げる役割を果たし、ホール・ペッチの関係により結晶粒が小さいほど材料強度が向上する。一方で、これまで小角粒界の存在は材料強度に大きく寄与しないとされてきた。小角粒界を効果的に利用することは、大角粒界と比べて、より小さなスケールでの強化が可能となる。本研究では従来の強化機構に加え、溶質原子が偏析した小角粒界も材料強度に繋がるとして理論的に強度を算出し、超高強度化に至るメカニズムを解明した。これにより、小角粒界への偏析は材料強度への寄与が大きく、超高強度アルミニウム合金の実現に重要な因子であることを明らかにした。
またAl-Fe合金の高強度化にも取り組んだ。Al中のFeは固溶量が0.052wt%と少なく、過剰のFeが含まれると凝固過程でAl3FeやAl6Feが形成されて延性が低下する。一方、Feはリサイクルの過程で蓄積されることから、不純物であるFe元素の有効活用が期待される。本研究でAl-2wt%Fe合金に巨大ひずみ加工を施すことで、超々ジュラルミンの強度に匹敵することを示し、その後の時効処理により700MPa以上へ向上できることを明らかにした。さらに、その微細組織は時効中も安定で、ピーク時効時においてもサブミクロンレベルの超微細粒組織が維持されることを示した。この結果は、国際学会（ICAA16：カナダ）で成果報告した。

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Grain Refinement of AZ31 and AZ61 Mg Alloys through Room Temperature Processing by UP-Scaled High-Pressure Torsion (2019)
  • Author(s): Masuda Takahiro、Horita Zenji
  • Journal Title: MATERIALS TRANSACTIONS Volume: 60 Issue: 7 Pages: 1104-1110
  • DOI: 10.2320/matertrans.M2018308
  • NAID: 130007666636
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2019-07-01
  • Peer Reviewed
• [Journal Article] Combination of High-Pressure Torsion with Incremental Feeding for Upsizing Sample (2018)
  • Author(s): Shigeno Etsuko、Komatsu Takuya、Sumikawa Kosei、Masuda Takahiro、Takizawa Yoichi、Yumoto Manabu、Otagiri Yoshiharu、Horita Zenji
  • Journal Title: MATERIALS TRANSACTIONS Volume: 59 Issue: 6 Pages: 1009-1012
  • DOI: 10.2320/matertrans.M2018039
  • NAID: 130006744116
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2018-06-01
  • Peer Reviewed / Open Access
• [Journal Article] The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel (2018)
  • Author(s): Kral Petr、Dvorak Jiri、Sklenicka Vaclav、Masuda Takahiro、Horita Zenji、Kucharova Kveta、Kvapilova Marie、Svobodova Marie
  • Journal Title: Materials Volume: 11 Issue: 5 Pages: 787-787
  • DOI: 10.3390/ma11050787
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Incremental Feeding High-Pressure Sliding for Achieving Large Area of Severe Plastic Deformation (2018)
  • Author(s): Y. Takizawa, K.Watanabe, T. Kajita, K. Sumikawa, T. Masuda, M. Yumoto, Y. Otagiri, Z. Horita
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 82 Issue: 1 Pages: 25-31
  • DOI: 10.2320/jinstmet.J2017038
  • NAID: 130006279159
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Peer Reviewed / Open Access
• [Journal Article] Production of superplastic Ti–6Al–7Nb alloy using high-pressure sliding process (2018)
  • Author(s): K. Watanabe, M. Ashida, T. Masuda, P. Kral, Y. Takizawa, M. Yumoto, Y. Otagiri, V. Sklenicka, T. Hanawa, Z. Horita
  • Journal Title: Journal of Japan Institute of Light Metals Volume: 68 Issue: 1 Pages: 9-15
  • DOI: 10.2464/jilm.68.9
  • NAID: 130006405254
  • ISSN: 0451-5994, 1880-8018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Incremental Feeding High-Pressure Sliding for Grain Refinement of Large-Scale Sheets: Application to Inconel 718 (2018)
  • Author(s): Y. Takizawa, K.Sumikawa, K. Watanabe, M. Yumoto, Y. Kanai, Y. Otagiri, Z. Horita
  • Journal Title: Metallurgical and Materials Transactions A Volume: 49 Issue: 5 Pages: 1830-1840
  • DOI: 10.1007/s11661-018-4534-2
  • Peer Reviewed / Open Access
• [Journal Article] Microstructure and creep behaviour of P92 steel after HPT (2018)
  • Author(s): P. Kral, J. Dvorak, V. Sklenicka, T. Masuda, Z. Horita, K. Kucharova, M.Kvapilova, M. Svobodova
  • Journal Title: Materials Science and Engineering A Volume: 723 Pages: 287-295
  • DOI: 10.1016/j.msea.2018.03.059
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Combination of High-Pressure Torsion with Incremental Feeding for Upsizing Sample (2018)
  • Author(s): E. Shigeno, T. Komatsu, K. Sumikawa, T. Masuda, Y. Takizawa, M. Yumoto, Y. Otagiri, Z. Horita
  • Journal Title: Materials Transactions Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy (2017)
  • Author(s): K. Edalati, T. Masuda, M. Arita, M. Furui, X. Sauvage, Z. Horita, R. Z. Valiev
  • Journal Title: Scientific Report Volume: 7 Issue: 1 Pages: 2662-2662
  • DOI: 10.1038/s41598-017-02846-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fabrication of high-strength and high-ductility laminated A2024 aluminum alloy/aluminum composite by severe plastic deformation under high pressure (2017)
  • Author(s): T. Masuda, Z. Horita
  • Journal Title: Journal of Japan Institute of Light Metals Volume: 67 Issue: 5 Pages: 179-185
  • DOI: 10.2464/jilm.67.179
  • NAID: 130007314771
  • ISSN: 0451-5994, 1880-8018
  • Peer Reviewed / Open Access
• [Journal Article] Strengthening of A2024 alloy by high-pressure torsion and subsequent aging (2017)
  • Author(s): Mohamed Intan Fadhlina、Masuda Takahiro、Lee Seungwon、Edalati Kaveh、Horita Zenji、Hirosawa Shoichi、Matsuda Kenji、Terada Daisuke、Omar Mohd Zaidi
  • Journal Title: Materials Science and Engineering: A Volume: 704 Pages: 112-118
  • DOI: 10.1016/j.msea.2017.07.083
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of ultra high strength (1GPa) aluminum alloy using severe plastic deformation under high pressure (2017)
  • Author(s): Masuda Takahiro、Horita Zenji
  • Journal Title: Journal of Japan Institute of Light Metals Volume: 67 Issue: 10 Pages: 519-520
  • DOI: 10.2464/jilm.67.519
  • NAID: 130006230240
  • ISSN: 0451-5994, 1880-8018
  • Peer Reviewed / Open Access
• [Journal Article] Extra Strengthening and Superplasticity of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding (2017)
  • Author(s): Masuda Takahiro、Takizawa Yoichi、Yumoto Manabu、Otagiri Yoshiharu、Horita Zenji
  • Journal Title: MATERIALS TRANSACTIONS Volume: 58 Issue: 12 Pages: 1647-1655
  • DOI: 10.2320/matertrans.M2017242
  • NAID: 130006219302
  • ISSN: 1345-9678, 1347-5320
  • Peer Reviewed
• [Journal Article] Mechanical properties and microstructure of extremely strengthened A2024 alloy produced by high-pressure torsion and subsequent aging (2017)
  • Author(s): T. Masuda, X. Sauvage, Z. Horita
  • Journal Title: Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2017) Volume: - Pages: 84-85
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Superplasticity of Inconel 718 after processing by high-pressure sliding (HPS) (2017)
  • Author(s): Y. Takizawa, T. Kajita, P. Kral, T. Masuda, K. Watanabe, M. Yumoto, Y. Otagiri, V. Sklenicka, Z. Horita
  • Journal Title: Materials Science and Engineering A Volume: 682 Pages: 603-612
  • Peer Reviewed
• [Journal Article] 高圧巨大ひずみ加工で複合化された高強度・高延性アルミニウム/2024アルミニウム合金積層材 (2017)
  • Author(s): 増田高大、堀田善治
  • Journal Title: 軽金属学会誌 Volume: 印刷中
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Scaling up of High-Pressure Sliding (HPS)for Grain Refinement and Superplasticity (2016)
  • Author(s): Y. Takizawa, T. Masuda, K. Fujimitsu, T. Kajita, K. Watanabe, M. Yumoto, Y. Otagiri, Z. Horita
  • Journal Title: Metallurgical and Materials Transactions A Volume: 47 Issue: 9 Pages: 4669-4681
  • DOI: 10.1007/s11661-016-3623-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Extra Strengthening and Superplasticity of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding (2016)
  • Author(s): 増田高大、瀧沢陽一、湯本学、小田切吉治、堀田善治
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 80 Issue: 9 Pages: 593-601
  • DOI: 10.2320/jinstmet.J2016012
  • NAID: 130005406774
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Peer Reviewed / Open Access
• [Journal Article] Extra-strengthening of A2024 alloy by high-pressure sliding and aging treatment (2016)
  • Author(s): T. Masuda, Y. Takizawa, M. Yumoto, Y. Otagiri, Z. Horita
  • Journal Title: Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2016) Volume: - Pages: 28-29
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 巨大ひずみ加工と時効処理を併用することで作製した高強度A2024合金の機械的特性と微細組織観察 (2018)
  • Author(s): 増田高大、Xavier Sauvage、堀田善治
  • Organizer: 軽金属学会高強度アルミニウム合金研究部会
  • Invited
• [Presentation] Microstructures and mechanical properties of supersaturated Al-2%Fe alloy produced by high-pressure torsion using upsized ring samples (2018)
  • Author(s): Masuda Takahiro、Horita Zenji
  • Organizer: 16th International Conference on Aluminum Alloys (ICAA16)
  • Int'l Joint Research
• [Presentation] Achieving ultra-high strengthening of A2024 alloy through combination of High-Pressure Torsion and subsequent aging treatment (2018)
  • Author(s): Takahiro Masuda, Xavier Sauvage, Zenji Horita
  • Organizer: TMS2018 147th Annual Meeting & Exhibition
  • Int'l Joint Research
• [Presentation] Extra-Strengthening of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding and subsequent aging treatment (2017)
  • Author(s): T.Masuda, Y.Takizawa, M.Yumoto, Y.Otagiri, Z.Horita
  • Organizer: The 7th Latin American Conference on Metastable and Nanostructured Materials (NANOMAT2017)
  • Place of Presentation: Hotel Fazenda Area que Canta(Brotas, SP, Brazil)
  • Year and Date: 2017-03-19
  • Int'l Joint Research
• [Presentation] Extra-strengthening of UFG AA2024 (2017)
  • Author(s): Takahiro Masuda, Zenji Horita
  • Organizer: International workshop on Design of nanostructured alloys using severe plastic deformation for enhances functionality
  • Int'l Joint Research
• [Presentation] HPT(High-Pressure Torsion)加工で結晶粒微細化した大型リングAl-2%Fe合金の組織解析と機械的特性評価 (2017)
  • Author(s): 増田高大、堀田善治
  • Organizer: 軽金属学会第132回春期大会
• [Presentation] Fabrication of high-strength Al-2%Fe alloy through grain refinement by High-Pressure Torsion using upsized ring samples (2017)
  • Author(s): Takahiro Masuda, Zenji Horita
  • Organizer: Seventh International Conference on Nanomaterials by Severe Plastic Deformation (NanoSPD7)
  • Int'l Joint Research
• [Presentation] Mechanical properties and microstructures of extremely strengthened A2024 alloy produced by High-Pressure Torsion and subsequent aging (2017)
  • Author(s): Takahiro Masuda, Xavier Sauvage, Zenji Horita
  • Organizer: International Workshop on Giant Straining Process for Advanced Materials in 2017 (GSAM2017)
  • Int'l Joint Research
• [Presentation] HPT(High-Pressure Torsion)加工を用いた結晶粒微細化と時効処理の併用によるA2024合金の超高強度化 (2017)
  • Author(s): 増田高大、Xavier Sauvage、堀田善治
  • Organizer: 日本金属学会秋期(161回)講演大会
• [Presentation] HPT(High-Pressure Torsion)加工と時効処理を併用することで作製した超高強度A2024合金の微細組織観察 (2017)
  • Author(s): 増田高大、Xavier Sauvage、堀田善治
  • Organizer: 軽金属学会第133回秋期大会
• [Presentation] 高圧スライド加工(HPS)法で結晶粒微細化したA2024合金(超ジュラルミン)の時効処理による超高強度化 (2016)
  • Author(s): 増田高大、瀧沢陽一、堀田善治、湯本学、小田切吉治
  • Organizer: 日本金属学会秋期(159回)講演大会
  • Place of Presentation: 大阪大学豊中キャンパス（豊中市待兼山町）
  • Year and Date: 2016-09-21
• [Presentation] Mechanical Properties of Ultrafine-Grained A2024 Alloy Using High-Pressure Sliding (2016)
  • Author(s): T.Masuda, K.Fujimitsu, Y.Takizawa, M.Yumoto, Y.Otagiri, Z.Horita
  • Organizer: 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)
  • Place of Presentation: 国立京都国際会館（京都市左京区）
  • Year and Date: 2016-08-02
  • Int'l Joint Research
• [Presentation] Extra-strengthening of A2024 Alloy by High-Pressure Sliding and aging treatment (2016)
  • Author(s): T.Masuda, Y.Takizawa, M.Yumoto, Y.Otagiri, Z.Horita
  • Organizer: International Workshop on Giant Straining Process for Advanced Materials in 2016 (GSAM2016)
  • Place of Presentation: 大博多ビル（福岡市博多区）
  • Year and Date: 2016-07-28
  • Int'l Joint Research
• [Presentation] 高圧スライド加工（HPS）法で超微細粒化したA2024合金の時効処理による高強度化 (2016)
  • Author(s): 増田高大、瀧沢陽一、堀田善治、湯本学、小田切吉治
  • Organizer: 平成28年度合同学術講演大会
  • Place of Presentation: 九州大学筑紫キャンパス（春日市春日公園）
• [Patent(Industrial Property Rights)] 長尺線材の製造方法 (2018)
  • Inventor(s): 堀田善治, 増田高大
  • Industrial Property Rights Holder: 堀田善治, 増田高大
  • Industrial Property Rights Type: 特許
  • Filing Date: 2018