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Research on Development of Shape Memory Elements by Powder Injection Molding Process

Research Project

Project/Area Number 09650122
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKinki University

Principal Investigator

KYOGOKU Hideki  Kinki University, School of Engineering, Professor, 工学部, 教授 (10258056)

Co-Investigator(Kenkyū-buntansha) KOMATSU Shinichiro  Kinki University, School of Engineering, Professor, 工学部, 教授 (70140316)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsShape memory alloy / Ti-Ni alloy / Powder injection molding / Sintering / Density / Mechanical properties / Recovery stress / Recovery strain
Research Abstract

The fabrication of Ti-Ni shape memory alloy by elemental powders was attempted by using both the powder injection molding and the spark-plasma sintering method in order to develop the shape memory elements. The relations between the fabrication conditions and the microstructures, mechanical properties and thermomechanical properties of the sintered compacts were investigated systematically. The results obtained are as follows ;
(1) In case of the powder injection molding method, the relative density of the sintered compacts was about 67%. Therefore, the tensile properties of the sintered compact were fairly less than those of the wrought materials ; the tensile strength was about 110 MPa and the elongation was 1.5%. But the sintered compacts showed apparently the shape memory property in the recovery stress test.
(2) In case of the spark-plasma sintering method, the appropriate sintering temperature and holding time, which can produce the high-relative density sintered compacts of about … More 98%, were found. The appropriate heat-treatment conditions making the microstructure of sintered compacts more homogeneous was also found. The sintered compacts having the superior tensile properties could be successfully fabricated by the heat treatment ; the tensile strength was around 800 MPa and the elongation was over 7%. This result is one of the highest tensile properties that have been already obtained by the powder metallurgy. The sintered compacts showed the superior recovery stress ; the recovery stress after loading of 2% pre-strain was around 230 MPa after first cycle and became around 300 MPa after 15th cycle.
Thus, we could investigate the basic shape memory characteristics of the sintered compacts enough to utilize the shape memory alloy for fabricating the elements. After this, the mechanical properties and shape memory characteristics may be improved by more detailed examination of the fabrication conditions and by structure homogenization by using alloy powder instead of elemental powders. Less

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] H. KYOGOKU: "Fabrication of TiNi Shape Memory Alloy by Spark-Plasma Sintering and Its Thermo-mechacnical Properties"Proceedings of 1998 Powder Metallurgy World Congress. Vol.5. 431-436 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 京極秀樹: "放電プラズマ焼結法によるTiNi形状記憶合金の作製とその熱・力学特性"日本機械学会論文集 (A編). 65. 873-878 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 京極秀樹: "粉末射出成形によるTiNi形状記憶合金の作製"粉体および粉末治金. 46. 1103-1107 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Kyogoku: "Fabrication of TiNi Shape Memory Alloy by Spark-Plasma Sintering and Its Thermo-Mechanical Properties"Proceedings of 1998 Powder Metallurgy World Congress. 5. 431-436 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Kyogoku: "Fabrication of TiNi Shape Memory Alloy by Spark-Plasma Sintering and Its Thermo-Mechanical Properties"Transactions of The Japan Society of Mechanical Engineers. 65, No. 632. 832-878 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Kyogoku: "Fabrication of TiNi Shape Memory Alloy by Powder Injection Molding"Journal of the Japan Socety of Powder and Powder Metallurgy. 46, No. 10. 1103-1107 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.KYOGOKU: "Fabrication of TiNi Shape Memory Alloy by Spark-Plasma Sintering and Its Thermo-mechacnical Properties"Proceedings of 1998 Powder Metallurgy World Congress. Vol.5. 431-436 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] 京極秀樹: "放電プラズマ焼結法によるTiNi形状記憶合金の作製とその熱・力学特性"日本機械学会論文集(A編). 65・632. 873-878 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 京極秀樹: "粉末射出成形によるTiNi形状記憶合金の作製"粉体および粉末冶金. 46・10. 1103-1107 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.KYOGOKU: "Fabrication of TiNi Shape Memory Alloy by Spark-Plasma Sintering and its Thermo-mechanical Properties" Proceedings of 1998 Powder Metallurgy World Congress,Granada. Vol.5. 431-436 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 京極秀樹: "放電プラズマ焼結法によるTiNi形状記憶合金の作製とその熱・力学特性" 日本機械学会論文集(A編). 65・632(掲載決定). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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