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Superelastic-superplastic powder-metallurgy NiTi shape memory alloy made by meso-scale particles

Research Project

Project/Area Number 07555478
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section試験
Research Field Physical properties of metals
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HASHIMOTO Satoshi  Graduate School of Engineering, Kyoto University Associate Professor, 工学研究科, 助教授 (50127122)

Co-Investigator(Kenkyū-buntansha) ONAKA Susumu  Graduate School of Engineering, Kyoto University Lecturer, 工学研究科, 講師 (40194576)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
Keywordspowder metallurgy / NiTi / superelasticity / shape mewary alloy / superplasticity / martenrite / Powder metallurgy / NiTi / super elasticity / shape memory alloy / super plasticity / martensite / fatigue / power metallurgy / Ni Ti / superelasticity / shape memory effect / superplasticity
Research Abstract

This is the first report for the powder metallurgy of titanium-nickel shape memory alloy having both shape memory and mechanical strength comparable to the alloy made by casting and wire-drawing. The fatigue properties and mechanism of the fracture were also investigated.
The process for the powder metallurgy is as follows ; Titanium-Nickel alloy powder was produced by Plasma Rotation Electrode Process. The method was used to suppress the impurity contamination during atomizing process. The powder with an average diameter of 0.287mm was hot-pressed by Hot Isosotatic Pressing, and a compact having a relative density of 99.7% was obtained. The martensitic transformation temperature was identical to that of the ingot used for making the powder.
Monotonic tensile test of the compact showed the shape memory strain and also the superelastic strain of 7% : the stress-strain behavior was almost identical to the cast alloy. However, it fractured by the deformation above 7%, which is much smaller than in cast alloys.
In the case of cyclic tensile deformation, the initiation and propergation of crack of the compact happenned by smaller tensile strain. The fracture occurred by the cleavage of the powder surfaces. By in-situ observation of the surface relief of tensile specimens, it is found that the stress-induced martensitic transformation develops by an inhomogenerous manner, which resembles the propagation of Ruders Band. The crack nucleated within the bands. Therefore, the fatigue life of the compact did not depend explicitely on the amplitude of tensile deformation.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] S.Onaka: "Retardation of Intergranular Fracture at Intermediate Temperatures by a Boundary node in a Cu-9at.%Pl Alloy Tricrystals" Acta Metall Maters. 43. 307-311 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Hashimoto: "Crack Initiation and Propagation in <110> Oriented Copper Single Crystals under Cyclic Deformation" Acta Metall.Mater.43. 675-680 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Hashimoto: "Crack Initiation and Propagation in Copper Bicrystals" Materials Science Forum. 207-209. 609-612 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Onaka: "Determination of the Aspect Ratio of a spheroidal Particla by Stereo observation" Materials Characterization. 34. 167-172 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Hashimoto: "Fatigue Crack Initiation and Propagation in Compact Tension Copper Single Crystals" Zeitschrift fur Metallkde.87. 128-134 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Hashimoto: "Fatigue Crack Initiation and Propagation in [210] Orieuted Copper Single Crystals in Vecuum and in Air" Scripta Mater.34. 775-779 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Onaka, F.Tajima, S.Hashimoto and S.Miura: "Retardation of Intergranular Fracture at Intermediate Temperatures by a Boundary Node in a Cu-9at.%Al Alloy Tricrystal" Acta Metallurgica et Materialia. 43. 307-311 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Vinogradov, S.Hashimoto and S.Miura: "Crack Initiation and Propagation in <110> Oriented Copper Single Crystals under Cyclic Deformation" Acta Metallurgica et Materialia. 43. 675-680 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Hashimoto, A.Vinogradov and S.Miura: "Fatigue Crack Propagation and Grain Boundary" Materials Science Forum. 207-209. 609-612 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Onaka: "Determination of the Aspect Ratio of a Spheroidal Particle by Stereo Observation" Materials Characterization. 34. 167-172 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Vinogradov, S.Hashimoto and S.Miura: "Fatigue Crack Initiation and Propagation in Compact Tension Copper Single Crystals" Zeitschrift fur Metallkunde. 86. 502-506 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Vinogradov, S.Hashimoto and S.Miura: "Fatigue Crack Initation and Propagation in [210] Oriented Copper Single Crystals in Vacuum and in Air" Scripta Materialia. 34. 775-779 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Onaka: "Retardation of Intergranular Fracture at Intermediate Temperature by a Boundary node in a Cu-9at.70Hl Alloy Tricrystal" Acta Metall.Mater.43. 307-311 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Hashimoto: "Crack Initiation and Propagation in 〈110〉 Oriented Copper Single crystals under Cyclic Deformation" Acta Metall.Mater.43. 675-680 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Hashimoto: "Crack Initiation and Propagation in Copper Bicrystal" Materials Science Forum. 207-209. 609-612 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Onaka: "Determination of the Aspect Ratio of a spheroidal Perticle by Steres Observation" Materials Characterization. 34. 167-172 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Hashimoto: "Fatigue Crack Initiation and Propagation in Compact Tension Copper Single Crystals" Zeitschrift fur Metallkde. 87. 128-134 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Hashimoto: "Fatigue Crack Initiation and Propagation in [210] Oriented Copper Single Crystals in Vacunm and in Air" Scripta Mater.34. 775-779 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Susumu Onaka: "Retardation of Intergranular Fracture at Intermediute Temperatures by a Boundary Node in a Cu-9at. %Al Alloy Tricrystal" Acta metall. mater.43. 307-311 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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