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1998 Fiscal Year Final Research Report Summary

Kinetic Measurement of the Martensitic Transformation in Y-TZP Samll Particles

Research Project

Project/Area Number 09650718
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionTottori University

Principal Investigator

HAYAKAWA Motozo  Tottori Univ., Faculty of Engineering, Professor, 工学部, 教授 (60093621)

Co-Investigator(Kenkyū-buntansha) ONDA Tetsuhiko  Tottori Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (80273879)
Project Period (FY) 1997 – 1998
Keywordstetragonal zirconia polycrystals / yttria doped / spherical particles / agglomcration in oil / martensitic transformation / isothermal martensite / kinetics measurement / micro-dilatometer
Research Abstract

Kinetics of the martensitic transformation of yttria doped zirconia was studied on small spherical specimens of 500 mum size prepared by the agglomeration method in oil. The main results obtained are as follows :
1. Small spherical specimens allowed to study the transformation kinetics by rapid cooling and heating treatments. Rapid quenching resulted in a highly metastable tetragonal phase at room temperature for the zirconia containing small amount of yttria which normally transform during the usual cooling rate for a bulk specimen. The fact suggested that the martensitic transformation involves a thermally activated process.
2. The metastable t-phase underwent isothermal transformation when held at an intermediate temperature. The kinetics was described by a C-curve in the TTT diagram with an upper limit at 450゚C and a nose at 350゚C.
3. The metastable t-phase undergoes a burst transformation during subzero-cooling. The Ms temperature was located at-1 18+-6゚C.
4. From the above observation, it was verified that the metastable t-phase undergoes both isothermal and athermal transformations depending on the heat treatment. Such phenomenon cannot be explained by the existing theories of the nucleation of martensite.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] M.Hayakawa et al.: "Elastic Constants of Zirconia Single Crystals Determined by X-ray" Materials Trans.JIM. 39・2. 268-274 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Onda et al.: "Effect of Divalent Elements on the Grain Growth of a ZrO_2-12ml%CeO_2" Proc.IMSP'97. 59-64 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kawano et al.: "Peak Effect of Critical Current Density in Stoichiometric SmBa_2Cu_3O_4" Mater.Science and Engineering. B54. 123-127 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hayakawa et al.: "Liquiol Phase Sintering of Y-TZP with CuO and Y_2 Cu_2O_5 Dopants" Mater.Sci.Forum. 304-306. 465-470 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Onda et al.: "Effect of Divalent Elements On the Grain Growth of TZP" Mater.Sci.Forum. 304-306. 471-475 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hayakawa et al.: "Isothermal and Athermal Martensitic Transf. in ZrO_2-Y_2O_3" Proc.ICOMAT'98, Mater.Sci.Eng.(印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hayakawa, H.Miyauchi, A.Ikegami, and M.Nishida: ""Elastic Constants of Zirconia Single Crystals Determined by X-ray Measurements for Polycrystals"" Materials Trans.JIM. 39,2. 268-274 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Onda, K.Okazaki, M.Hayakawa, H.Yamauchi and H.Suematsu: ""Effect of Divalent Elements on the Grain Growth of a Zirconia-12mol% Ceria Alloy"" Proc.IMSP'97, Mie University Press. 59-64 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kawano, K.Fujinami, H.Suematsu, T.Onda, and M.Hayakawa, M.Karppinen, H.Ogiwara, and H.Yamauchi: ""Peak Effect of Critical Current Density in Stoichiometric SmBa2Cu3Oy Sample"" Materials Science Engineering. B54. 123-127 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hayakawa, T.Inoue, J-H.Pec, T.Onda, H.Suematsu, and H.Yamauchi: ""Liquid Phase Sintering of Y-TZP with CuO and Y2Cu2O5 Dopants"" Mater.Sci.Forum. 304-306. 465-470 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Onda, K.Okazaki, H.Suematsu, H.Yamauchi and M.Hayakawa: ""Effect of Divalent Elements on the Grain Growth of TZP"" Mater.Sci.Forum. 304-306. 471-475 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hayakawa, K.Nishio, J.Hamakita and T.Onda: ""Isothermal and Athermal Martensitic Transformations in a Zirconia- Yttria Alloy"" Mater.Sci.Engineering. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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