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Nanostructure control

Research Project

Project/Area Number 08242106
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionKyoto University

Principal Investigator

MAKI Tadashi  Kyoto University, Dept. of Mater. Sci. and Eng., Prof., 大学院・工学系研究科, 教授 (10026247)

Co-Investigator(Kenkyū-buntansha) TAKAYAMA Yoshimasa  Utsunomiya Univ., Fac. of Eng., Assoc. Prof., 工学部, 助教授 (60163325)
HAYAKAWA Motozou  Tottori Univ. Faculty of Engineering, Prof., 工学部, 教授 (60093621)
HANADA Shuji  Tohoku Univ. Institute for Mater. Research, Prof., 金属材料研究所, 教授 (10005960)
早川 元造  鳥取大学, 工学部, 教授 (69424512)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥72,200,000 (Direct Cost: ¥72,200,000)
Fiscal Year 1998: ¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 1997: ¥30,100,000 (Direct Cost: ¥30,100,000)
Fiscal Year 1996: ¥30,900,000 (Direct Cost: ¥30,900,000)
KeywordsSuperplasticity / Nanostructure / Microstructure control / Microduplex structure / Ferrous alloy / Aluminum alloy / Inter-metallics / Ceramics / 2相微細組織
Research Abstract

The purpose of the present research project is to establish various methods of nanostructure control and to make clear the mechanism of superplasticity in various materials such as metals and alloys, intermetallics and ceramics. The main results obtained are as follows.
(1) New types of heat treatments for appearance of superplasticity in duplex stainless steel and high carbon steel were developed. Microduplex structure with a grain size of 0.5〜1.0μm can be obtained by simple treatments such as heavy cold-rolling of as-received hot-rolled plates in duplex stainless steel and the quenching from (γ + θ) temperature in high carbon steel.
(2) Effect of liquid phase at grain boundaries on superplasticity was investigated in particle-dispersed aluminum alloys. A large elongation was obtained at temperatures just below the solidus one for a 7475 Al alloy. The thickness of liquid phase in the test condition corresponding to the peak elongation was estimated to be 10〜60nm for the 7475 alloy.
(3) Mechanism of superplastic deformation in monolithic intermetallics was found to depend on ordered crystal structure. Grain boundary sliding plays an important role in fcc-derivative intermetallics exhibiting fine-grained superplasticity, while dynamic recrystallization and/or dynamic recovery is responsible for coarse-grained superplasticity in bcc-derivative intermetallics.
(4) The effect of Mg, Ca, Sr and Ba additions on the grain size refinement of Y-TZP and Ce-TZP was studied. It was found that Ca is the most effective element for the grain refinement. The addition of small amount of CuO in Y-TZP was found to be effective in reducing the sintering temperature, grain size and the stress rcquired for superplastic deformation.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] Y.Takayama,T.Tozawa,H.kato: "Superplasticity and Thickness of Liquid Phase in the Vicinity of solidus Temperature in a 7475 Aluminum Alloy"Acta Mater. 47. 1263-1270 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 高山善匡、佐々木伸也、杜澤達美、加藤一、渡部英男、小久保正史: "5083アルミニウム合金の広い温度およびひずい速度範囲にわたる超塑性と破面形態"軽金属. 49. 378-382 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W.-Y.Kim,S.Hanada,T.Sakai: "Superplastic Defamation of Boron Doped Fe-18at % Si"Mater. Sci. Eng. A. 248. 78-86 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W.-Y.Kim,S.Hanada,T.Takasugi: "Flow Behavior and Microstructure of Co_3Ti Intermetallic Alloy during Superplastic Deformation"Acta mater. 46. 3593-3604 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W.-Y.Kim,S.Hanada,T.Takasugi: "Large Tensile Elongation Behavior of Fe-14at. % Si Single Crystal"Acta mater. 46. 5701-5713 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Hayakawa,K.Nishio,J.Hamakita,T.Oncla: "Isothermal and Athermal Martensitic Transformation in a Zirconia-Yttria Alloy"Mater. Sci. Eng. A. 275-277. 213-217 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Takayama, T. Tozawa and H. Kato: "Superplasiticity and Thickness of Liquid Phase in the Vicinity of Solidus Temperature in a 7475 Aluminum Alloy"Acta Mater.. 47. 1263-1270 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Takayama, S. Sasaki, T. Tozawa, H. Kato ; H. Watanabe and M. Kokubo: "Superplasticity and Fractography over Wide Ranges of Temperature and Strain Rate in a 5083 Aluminum Alloy"J. Japan Inst. Light Metals. 49. 378-382 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W. -Y. Kim, S. Hanada and T. Sakai: "Superplastic Deformation of Boron Doped Fe-18at%Si"Mater. Sci. Eng. A. 248. 78-86 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W. -Y. Kim, S. Hanada and T. Takasugi: "Flow Behavior and Microstructure of CoィイD23ィエD2Ti Intermetallic Alloy during Superplastic Deformation"Acta mater.. 46. 3593-3604 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W. -Y. Kim, S. Hanada and T. Takasugi: "Large Tensile Elongation Behavior of Fe-14at.%Si Single Crystal"Acta mater.. 46. 5701-5713 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Hayakawa, K. Nishio, J. Hamakita and T. Onda: "Isothermal and Athermal Martensitic Transformations in a Zirconia-Yttria Alloy"Mater. Sci. Eng. A. 275-277. 213-217 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Sato: "Microstructure Control for Superplasticity of an Ultra-High Carbon Steel" Mater.Sci.Forum. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Yamazaki: "Microstructure Change during Superplasitic Deformation in (α+γ) Duplex Stainless Steel" Mater.Sci.Forum. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Furuhara: "Superplasticity of (α+γ) Duplex Stainless Steel with Elongated Secondary Phase" Mater.Sci.Forum. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] W.-Y.Kim: "Large tensile elongation behavior of Fe-14at%Si siorgle crystal" Acta Mater.46. 5701-5713 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] W.-Y.Kim: "Flow behavior and microstructure of Co_3Ti intermetallic alloy during superplastic deformation" Acta Mater.46. 3593-3604 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] W.-Y.Kim: "Superplastic deformation of boron doped Fe-18at%Si" Mater.Sci.Eng.A248. 78-86 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Hayakawa: "Liquid Phase Sintering of Y-TZP with CuO and Y_2Cu_2O_5 Dopants" Mater.Sci.Forum. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Onda: "Effect of Divalent Elements on the Grain Growth of TZP" Mater.Sci Forum. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Takayama: "Superplasticity over Wide Ranges of Temperature and Strain Rate in a 5083 Aluminum Alloy" Aluminum Alloys,JILM. 2. 1051-1056 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Takayama: "Superplasticity and Thickness of Liquid Phase in the Vicinity of Solidus Temperature in a 7475 Aluminum Alloy" Acta Mater.47 (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Maki: "Microstructural Evolution during High Strain Rate Super plastic Deformation in Microduplex Stainless Steel" Mater.Sci.Forum. 233-234. 139-146 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Hanada: "Superplastic Deformation of Co_3 Ti Alloy" Scripta Metall. 37. 1053-1058 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Hanada: "Superplasticity in Intermetallics" Proc.of Int.Conf.on Thermomechanical Processing of Steels and Other moterials,ed by T.Chandra and T.Sakai,TMS. 1883-1889 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Hayakawa: "Elastic Constants of Zirconia Single Crystals Determined by X-ray Measurements for Polycrystals" Mater.Trans,JIM. 39・2. 268-274 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Hayakawa: "Effect of Divalent Elements on the Grain Growth of a Zirconla-12mol% Ceria Alloy" Proc.of IMSP'97 (Aug・1997), Mie Univ.(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Takayama: "Superplasticity and Flow Stress in the Vicinity of Solidus Temperature in Aluminium Alloys" Proc.of IMSP'97 (Aug.1997),Mie Univ.(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Maki: "Microstructural Evolution during High Strain Rate Superplastic Deformation in Microduplex Stainless Steel" Mater.Sci.Forum. 233-234. 139-146 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Takayama: "Computer Simulation of Grain Growth Induced by Superplastic Deformation" Mater.Sci.Forum. 204-206. 319-324 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Takayama: "Usefulness of the R-type Specimen Method for Evaluation of Superplastic Characteristics in a 7475 Aluminum Alloy" Mater.Sci.Forum. 233-234. 117-122 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Hanada: "Superplastic Deformation Behavior Fe_3Si Intermetallic Alloy W.-Y.Kim" Mater.Sci.Forum. 233-234. 279-286 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Hanada: "High Temperature Deformation of Nb3Al/NB Alloys" Mater.Sci.Forum. 233-234. 311-318 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2019-02-15  

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