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Development of New Fe-based Shape Memory Alloy (Fe-Ni-Co-Ti Alloy)

Research Project

Project/Area Number 61850131
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionKyoto University

Principal Investigator

MAKI Tadashi (1987-1988)  Kyoto University, Faculty of Engineering, Professor, 工学部, 教授 (10026247)

田村 今男 (1986)  京大, 工学部, 教授 (70025815)

Co-Investigator(Kenkyū-buntansha) TSUZAKI Kaneaki  Kyoto University, Faculty of Engineering, Assistant, 工学部, 助手 (40179990)
梅本 実  京都大学, 工学部, 助手 (90111921)
牧 正志  京都大学, 工学部, 助教授 (10026247)
Project Period (FY) 1986 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsShape Memory Effect / Shape Memory Alloy / Fe-Ni-Co-Ti Alloy / Thermoelastic Martensite / Thin Plate Martensite / Ferrous Martensite / Ausaging / γ'-Ni_3Ti / FeーNiーCoーTi合金 / γ′ーNi_3Ti / γ´-【Ni_3】Ti
Research Abstract

1. The properly ausaged Fe-Ni-Co-Ti alloys produce a thin plate martensite which is completely twinned. The thermal hysteresis of thin martensite is widely changed by the adjustment of chemical composition and the ausaged condition, and these thin plate martensites cause a perfect shape memory effect irrespective of the extent of the thermal hysteresis. For example, when Fe-33Ni-10Co-4Ti alloy is ausaged at 973K for 18ks, the thermoelastic martensite whose Ms and Af temperature are below room temperature is formed and the complete shape memory effect occurs during heating up to room temperature after deformation at 77 K. In the case of Fe-31Ni-10Co-3Ti alloy ausaged at 873K for 3.6ks, thin plate martensite with a large thermal hysteresis (i.e., Ms 200K, As 350K, Af 500K) is formed. This specimen which is fully austenitic at room temperature shows a complete shapememory effect when specimen is heated up above Af after the deformation at temperatures near or below Ms. The as-ausaged spec … More imen hardly exhibits the shape memory effect when deformed at room temperature. However, when the specimen is once subzero cooled to liquid nitrogen to produce a large amount of martensite, the almost complete shape memory effect occurs even by the deformation at room temperature. It has been found to be characteristic that the shape memory effect in Fe-Ni-Co-Ti alloys occurs over the wide temperature range from low temperature to high temperature by the change in the extent of thermal hysteresis.
2. The ductility of austenite after ausaging is improved by the addition of B or Al to Fe-Ni-Co-Ti alloys. This is due to the suppression of precipitation of phase along austenite grain boundaries.
3. When the thermoelastic martensite in Fe-33Ni-10Co-4Ti alloy is thermally cycled between 273K and 77K, the thermal hysteresis becomes markedly large, i.e., the Ms temperature is slightly decreased and the Af is markedly increased. After several thermal cycles, the Af temperature is raised above room temperature and the some amount of martensite remains even after the heating up to room temperature. Therefore, the degree of shape recovery is decreased from 100% to about 60% by the transformation. Less

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] T.Maki: Proc.of Int.Conf.on Martens ite Transformations(ICOMAT-86). 973-970 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.Maki: Proc.of MRS Int.Meeting on Advanced Materials. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.Maki: ISIJ Internatioanl. 29. 5 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.Maki: Proc.of Int.Conf.on Martensitic Transformation(ICOMAT-89). (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.Maki: Proc.of 1st Japan Int.SAMPE Symposium and Exhibition. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 牧正志: "学術月報" 日本学術振興会, 1 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. Maki; I. Tamura: "Shape Memory Effect in Ferrous Alloys" Proc. of Int. Conf. on Martensite Transformations (ICOMAT-86). 963-970 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. Maki: "Martensitic Transformation and Shape Memory Effect in Ausaged Fe-Ni-Co-Ti Alloys" Proc. of MRS Int. Meeting on Advanced Materials.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. Maki; S. Furutani; I. Tamura: "Shape Memoty Effect Related to Thin Plate Martensite with Large Thermal Hysteresis in Ausaged Fe-Ni-Co-Ti Alloy" ISIJ International.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. Maki: "Microstructure and Mechanical Properties of Ferrous Martensite" Proc. of Int. Conf. on Martensitic Transformation (ICOMAT-89).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. Maki: "Recent Developments in Fe-based Shape Memory Alloys" Proc. of 1st Japan Int. SAMPE Symposium and Exhibition.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T. Maki: Japanese Scientific Monthly. Japan Society for the Promotion of Science,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] T.Maki: Proc.of Int.Conf.on Martensite Transformations(ICOMAT-86). 963-970 (1986)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Maki: Proc.of MRS Int. Meeting on Advanced Materials. (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Maki: ISIJ International. 29. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Maki: Proc.of Int.Conf.on Martensitic Transformation(ICOMAT-89). (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Maki: Proc.of Ist Japan Int.SAMPE Symposium and Exhibition. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 牧正志: "学術月報" 日本学術振興会, 1 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Maki: Proc.of Int.Conf.on Martensitic Transformations(ICOMAT-86). 963-970 (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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