UP DATE July 27, 2009

Japanese


Publications



Articles

2009

  1. Densification Behavior of Ti-Doped Polycrystalline Alumina in a Nitrogen-Hydrogen Atmosphere, H. Yoshida, K. Hiraga and T. Yamamoto, Mater. Trans., 50 (2009) 1032-1036.
  2. Spark-Plasma-Sintering Condition Optimization for Producing Transparent MgAl2O4 Spinel Polycrystal, K. Morita, B.-N. Kim, H. Yoshida and K. Hiraga, J. Am. Ceram. Soc., 92 (2009) 1208-1216.
  3. Doping amount and temperature dependence of superplastic flow in tetragonal ZrO2 polycrystal doped with TiO2 and/or GeO2, H. Yoshida, K. Morita, B.-N. Kim, K. Hiraga and T. Yamamoto, Acta Mater., 57 (2009) 3029-3038.
  4. Microstructure and optical properties of transparent alumina, B.-N. Kim, K.@Hiraga, K. Morita, H. Yoshida, M. Miyazaki and T. Kagawa, Acta Mater., 57 (2009) 1319-1326.
  5. Ionic conductivity of tetragonal ZrO2 polycrystal doped with TiO2 and GeO2, H. Yoshida, K. Morita, B.-N. Kim and K. Hiraga, J. Euro. Ceram. Soc., 29 (2009) 411-418.
  6. Effects of heating rate on microstructure and transparency of spark-plasma-sintered alumina, b.-N. Kim, K. Hiraga, K. Morita and H. Yoshida, J. Euro. Ceram. Soc., 29 (2009) 323-327

2008

  1. Densification of Nanocrystalline Yttria by Low Temperature Spark Plasma Sintering, H. Yoshida, K. Morita, B.-N. Kim, K. Hiraga, M. Kodo, K. Soga and T. Yamamoto, J. Am. Ceram. Soc., 91 (2008) 1707-1710.
  2. Fabrication of Transparent MgAl2O4 Spinel Polycrystal by Spark-Plasma-Sintering Processing, K. Morita, B.-N. Kim, K. Hiraga and H. Yoshida, Scr. Mater., 58 (2008) 1114-1117.

2007

  1. High-Strain-Rate Superplastic Flow in Tetragonal ZrO2 Polycrystal Enhanced by the Dispersion of 30 vol% MgAl2O4 Spinel Particles, K. Morita, K. Hiraga and B.-N. Kim, Acta Mater., 55 (2007), 4517-4526.
  2. Spark Plasma Sintering of Transparent Alumina, B.-N. Kim, K. Hiraga, K. Morita and H. Yoshida, Scr. Mater., 57 (2007), 607-610.
  3. Microstructural Examination in High-Strain-Rate Superplastically Deformed Tetragonal ZrO2 Dispersed with 30vol% MgAl2O4 Spinel, K. Morita, K. Hiraga, B.-N. Kim, Y. Sakka, J. Mater. Res., 22 (2007), 801-813.
  4. High-Strain-Rate Superplasticity in Oxide Ceramics, K. Hiraga, B.-N. Kim, K. Morita, H. Yoshida, T. S. Suzuki and Y. Sakka, Sci. Technol. Adv. Mater., 8 (2007), 578-587.
  5. Development of High-Strain-Rate Super Plastic Oxide Ceramics, K. Hiraga, J. Ceram. Soc. Jpn., 115 (2007), 395-401.
  6. Fabrication of Nanocrystalline Superplastic ZrO2 ceramics, K. Morita, K. Hiraga, B.-N. Kim, H. Yoshida and Y. Sakka, Mater. Sci. Forum, 551-552 (2007), 491-496.
  7. Estimation of Grain Boundary Diffusivity in Cation-doped Polycrystalline Alumina, H. Yoshida, K. Morita, B.-N. Kim, K. Hiraga, T. Yamamoto and T. Sakuma, Mater. Sci. Forum, 558-559 (2007), 997-1002.
  8. Grain-Boundary Structure and Phase-Transformation Mechanism in Yttria-Stabilized Tetragonal Zirconia Polycrystal, K. Matsui, H. Yoshida and Y. Ikuhara, Mater. Sci. Forum, 558-559 (2007), 921-926.
  9. High Temperature Creep Strength of Si3N4-Y2Si2O7 Cerramics by Stress Relaxation Based on a New Interpretation Model, Z. Hong, H. Yoshida and T. Sakuma, Key Eng. Mater., 336-338 (2007), 1420-1423.

2006

  1. Doping Dependence of High Temperature Plastic Flow Behavior in TiO2 and GeO2-doped Tetragonal ZrO2 Polycrystals, H. Yoshida, J. Ceram. Soc. Jpn., 114 (2006), 155-160.
  2. Micro structure and surface segregation of 3mol% Y2O3-doped ZrO2 particles, S. Ii, H. Yoshida, K. Matsui, N. Ohmichi and Y. Ikuhara, J. Am. Ceram. Soc., 89 (2006), 2952-2955.
  3. Effect of Alumina-doping on Grain Boundary Segregation-induced Phase Transformation in Yttria-stabilized Tetragonal Zirconia Polycrystal, K. Matsui, N. Ohmichi, M. Ohgai, H. Yoshida and Y. Ikuhara, J. Mater. Res., 21 (2006), 2278-2289.
  4. Grain Boundary Segregation-induced Phase Transformation in Yttria-stabilized Tetragonal Zirconia Polycrystals, K. Matsui, N. Ohmichi, M. Ohgai, H. Yoshida and Y. Ikuhara, J. Ceram. Soc. Jpn., 114 (2006), 230-237.
  5. Superplastic Behavior in GeO2-TiO2 doped TZP, H. Ito, H. Yoshida, Y. Ikuhara, T. Yamamoto and T. Sakuma, Key Eng. Mater., 317-318 (2006), 407-410.
  6. Strengthening of ZrO2 Ceramics due to Nano-Crystallization, K. Morita, K. Hiraga, B.-N. Kim, H. Yoshida, Adv. Sci. Tech., 45 (2006), 1674-1679.
  7. High temperature Plastic Flow and Ductility in Polycrystalline Oxide Ceramics: Doping Effect and Related Phenomena, H. Yoshida, K. Morita, B.-N. Kim, K. Hiraga, T. Yamamoto, Y. Ikuhara and T. Sakuma, Adv. Sci.Technol., 45 (2006), 1620-1625.
  8. Microstructural Design for Attaining High-Strain-rate Superplasticity in Oxide Materials, K. Hiraga, B.-N. Kim, K. Morita, H. Yoshida, T. S. Suzuki and Y. Sakka, Adv. Sci. Technol., 45 (2006), 923-932.
  9. Improvement of High Temperature Ductility in Oxide Ceramics by Grain Boundary Nanostructure Control, H. Yoshida, K. Morita, B.-N. Kim, K. Hiraga, T. Yamamoto and Y. Ikuhara, Trans. Mater. Res. Soc. Jpn., 31 (2006), 533-536.
  10. High strength Nanocrystalline ZrO2-Spinel Ceramics, K. Morita, B.-N. Kim, H. Yoshida, K. Hiraga, and Y. Sakka, Trans. Mater. Res. Soc. Jpn., 31 (2006), 1029-1032.

2005

  1. Viscous Grain-Boundary Sliding and Grain Rotation Accommodated by Grain-Boundary Diffusion, B.-N. Kim, K. Hiraga and K. Morita, Acta Mater., 53 (2005), 1791-1798.
  2. Rate of Creep due to Grain-Boundary Diffusion in Polycrystalline Solids with Grain-Size Distribution, B.-N. Kim, K. Hiraga, K. Morita and I.-W. Chen, Philos. Mag., 85 (2005) 2281-2292.
  3. Dopant Effect on Grain Boundary Diffusivity in Polycrystalline Alumina, H. Yoshida, S. Hashimoto and T. Yamamoto, Acta Mater., 53 (2005), 433-440.
  4. Improvement of High Temperature Tensile Ductility in Cubic ZrO2 through TiO2 Addition, H. Yoshida, A. Kubo, H. Ito, H. Nagayama and T. Sakuma, Scr. Mater., 52 (2005), 365-368.
  5. Synthesis of Dense Nanocrystalline ZrO2-MgAl2O4 Spinel Composite, K. Morita, K. Hiraga, B.-N. Kim, H. Yoshida, Y. Sakka, Scripta Mater., 53 (2005) 1007-1012.
  6. Mirostructural Design for High-Strain-Rate Superplastic Oxide Ceramics, K. Hiraga, B.-N. Kim, K. Morita, T. S. Suzuki and Y. Sakka, J. Ceram. Soc. Jpn., 113 (2005), 191-197.
  7. Effect of Viscous Grain-Boundary Sliding on High-Temterature Deformation of Nano-Sized Grains, B.-N. Kim, K. Hiraga, K. Morita and H. Yoshida, Rev. Adv. Mater. Sci., 10 (2005) 54-58.
  8. Fabrication and Microstructural Characterization of Nano-Crystalline ZrO2-Baseded Composite, K. Morita, K. Hiraga, B.-N. Kim, H. Yoshida, Y. Sakka, Rev. Adv. Mater. Sci., 10 (2005) 39-44.
  9. Fabrication of Nanocrystalline ZrO2-Spinel Composite, K. Morita, B.-N. Kim, K. Hiraga and Y. Sakka, Trans. Mater. Res. Soc. Jpn., 30 (2005), 1117-1120.

2004

  1. A Threshold Stress for the Superplastic Deformation in Y2O3-Stabilized Tetragonal ZrO2, Morita, B.-N. Kim, K. Hiraga, and Y. Sakka, Mater. Sci. Eng. A., 387-89 (2004), 655-658.
  2. Effect of Titania and Magnesia Addition to 3 mol% Yttria Doped Tetragonal Zirconia on Some Diffusion Related Phenomena, Y. Sakka, T. S. Suzuki, T. Matsumoto, K. Morita, K. Hiraga and Y. Moriyoshi, Solid State Ionics, 172 (2004), 499-503.
  3. Fracture Toughness of Yttria-Stabilized Cubic Zirconia (8Y-CSZ) Doped with Pure Silica, K. Hiraga, K. Morita, B.-N. Kim and Y. Sakka, Mater. Trans., 45 (2004), 3324-3329.
  4. Kinetics of Normal Grain Growth Depending on the Size Distribution of Small Grains, B.-N. Kim, K. Hiraga and K. Morita, J. Jpn. Inst. Met., 68 (2004), 913-918.
  5. Analysis of Creep Due to Grain-Boundary Diffusion in Hexagonal Microstructures, B.-N. Kim, K. Hiraga, K. Morita and B.-W. Ahn, Philos. Mag. A., 84 (2004), 3251-3262.
  6. Effect of MgAl2O4 Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO2 Polycrystal, K. Morita, K. Hiraga, B.-N. Kim, and Y. Sakka, Mater. Trans., 45 (2004), 2073-2077.
  7. Tensile Failure in a Superplastic Alumina, K. Hiraga and K. Nakano, Z. Metallkude., 95 (2004), 559-564.
  8. Effect of Minor SiO2 Addition on the Creep Behavior of Superplastic Tetragonal ZrO2, K. Morita, K. Hiraga, and B.-N. Kim, Acta Mater., 52 (2004), 3355-3364.
  9. Strain Softening and Hardening during Superplastic-Like Flow in a Fine-Grained MgAl2O4 Spinel Polycrystal, K. Morita, K. Hiraga, B.-N. Kim, T. S. Suzuki and Y. Sakka, J. Am. Ceram. Soc., 87 (2004), 1102-1109.
  10. High-Strain Rate Superplastic Zirconia Systems, Y. Sakka, T. S. Suzuki, K. Morita, B.-N. Kim and K. Hiraga, Key Eng. Mater., 264-268 (2004), 285-288.
  11. Fabrication of High-Strain Rate Superplastic Yttria-Doped Zirconia Polycrystals by Adding Manganese and Aluminum Oxides, Y. Sakka, T. Ishii, T. S. Suzuki, K. Morita and K. Hiraga, J. Euro. Ceram. Soc., 24 (2004), 449-453.

2003

  1. Simulation of Superplastic Deformation Based on a Mantle Model, B.-N. Kim, K. Morita and K. Hiraga, Mater. Sci. Forum., 447-448 (2003), 73-78.
  2. High-Strain-Rate Superplasticity in Oxide Ceramics, K. Hiraga, B.-N. Kim, K. Morita and Y. Sakka, Mater. Sci. Forum., 447-448 (2003), 291-297.
  3. High-Strain-Rate Superplasticity in 3 mol%-Y2O3-Stabilized Tetragonal ZrO2 Dispersed with 30vol% MgAl2O4 Spinel, K. Morita, B.-N. Kim, K. Hiraga and Y. Sakka, Mater. Sci. Forum, 447-448 (2003), 329-334.
  4. Kinetics of Normal Grain Growth Depending on the Size Distribution of Small Grains, B.-N. Kim, K. Hiraga and K. Morita, Mater. Trans., 44 (2003), 2239-2244.
  5. Rate of Diffusion Creep Accompanied by Grain Boundary Sliding in Elongated Microstructures, B.-N. Kim, K. Morita and K. Hiraga, Mater. Sci. Eng. A., 363 (2003), 67-71.
  6. Yield Drop in High-Strain-Rate Superplastic Deformation of ZrO2-30 vol% MgAl2O4 Spinel Composite, K. Morita, B.-N. Kim, K. Hiraga and Y. Sakka, Philos. Mag. Lett., 83 (2003), 533-541.
  7. Enhanced Superplasticity in Zirconia-Alumina-Spinel Composite Ceramics, B.-N. Kim and K. Hiraga, Mater. Sci. Forum, 426-432 (2003), 2729-2734.
  8. Grain-Boundary Sliding in Elongated Microstructures during Diffusion Creep, B.-N. Kim, K. Morita, K. Hiraga and B.-W. Ahn, Philos. Mag. A, 83 (2003), 1675-1684.
  9. Reply to "Comment on the Role of Intragranular Dislocations in Superplastic Yttria-Stabilized Zirconiah, K. Morita and K. Hiraga, Scr. Mater. 48 (2003), 1403-1407.
  10. Evaluation of the Threshold Stress for Creep Deformation in a 3 mol% Y2O3-Stabilized Tetragonal ZrO2 Polycrystal, K. Morita and K. Hiraga, Philos. Mag. Lett., 83 (2003), 97-106.
  11. Enhanced Tensile Ductility in ZrO2-Al2O3-Spinel Composite Ceramics, B.-N. Kim, K. Hiraga, K.Morita, Y. Sakka and T. Yamada, Scr. Mater., 48 (2002), 775-779.
  12. Simulation of Cavitation Processes in Superplastic Deformation, B.-N. Kim and K. Hiraga, Metall. Mater. Trans. A., 33A (2003), 3449-3455.
  13. Low-Temperature and High-Strain Rate Superplastic Zirconia, Y. Sakka, T. Matsumoto, T. S. Suzuki, K. Morita, B.-N. Kim, K. Hiraga and Y. Moriyoshi Adv. Eng. Mater., 5 (2003), 130-133.

2002

  1. Processing-Dependent Microstructural Factors Affecting Cavitation Damage and Tensile Ductility in a Superplastic Alumina Dispersed with Zirconia, K. Hiraga, K. Nakano, T. S. Suzuki and T. Sakka, J. Am. Ceram. Soc., 85 (2002), 2763-2770.
  2. Enhanced Tensile Ductility in ZrO2-Al2O3-Spinel Composite Ceramics, B.-N. Kim, K. Hiraga, K.Morita, Y. Sakka and T. Yamada, Scr. Mater., 48 (2002), 775-779.
  3. Superplastic Ceramic Deformable at High Strain Rates, B.-N. Kim and K. Hiraga, Chem. Eng. Technol., 25 (2002), 1021-1023.
  4. High-Strain-Rate Superplasticity in Y2O3-Stabilized Tetragonal ZrO2 Dispersed with 30 vol%MgAl2O4 Spine, K. Morita, K. Hiraga and Y. Sakka, J. Am. Ceram. Soc., 85 (2002), 1900-1902.
  5. Critical Assessment of High-Temperature Deformation and Deformed Microstructure in High- Purity Tetragonal Zirconia Containing 3 mol.% Yttria, K. Morita and K. Hiraga, Acta Mater., 50 (2002), 1075-1085.
  6. Two-Dimensional Simulation of Microstructural Changes during Superplastic Deformation. B.-N. Kim and K. Hiraga, Trans. Mater. Res. Soc. Jpn., 27 (2002), 313-316.
  7. Microstructure and Superplasticity in Various Zirconia-Dispersed Aluminas, T. S. Suzuki, Y. Sakka, K. Nakano and K. Hiraga, J. Ceram. Soc. Jpn., 110 (2002), 927-930.
  8. Fabrication of Tailored Alumina-Based Ceramics Through Colloidal Processing, Y. Sakka, T. S. Suzuki and K. HIraga, Key. Eng. Mater., 224-226 (2002), 619-622.
  9. Colloidal Processing and Superplastic Proprties of Fine-Grained Zirconia, Y. Sakka, T. S. Suzuki, K. Morita and K. Hiraga, Key Eng. Mater., 206-208 (2002), 645-648.

2001

  1. A High-Strain-Rate Superplastic Ceramic, B.-N. Kim, K. Hiraga, K. Morita and Y. Sakka, Nature, 413 (2001), 288-291.
  2. Effect of Cavitation on Superplastic Flow of 10% Zirconia-Dispersed Alumina, B.-N. Kim, K. Hiraga, Y. Sakka and B.-K. Jang, Scr. Mater., 45 (2001), 61-67.
  3. Colloidal Processing and Superplastic Properties of Zirconia- and Alumina-Based Nanocomposites, Y. Sakka, T. S. Suzuki, K. Morita, K. Nakano and K. Hiraga, Scr. Mater., 44 (2001), 2075-2078.
  4. High Temperature Deformation of a Yttria-Stabilized Tetragonal Zirconia, K. Morita, K. Hiraga and Y. Sakka, Mater. Sci. Forum., 357-360 (2001), 187-192.
  5. Cavity Formation and Growth in a Superplastic Alumina Containing Zirconia Particles, K. Hiraga, K. Nakano. T. S. Suzuki and Y. Sakka, Mater. Sci. Forum., 357-360 (2001), 193-198.
  6. Superplastic Alumina Ceramics Dispersed with Zirconia and Spinel, B.-N. Kim, K. Morita, K. Hiraga and Y. Sakka, Mater. Sci. Forum., 357-360 (2001), 533-538.
  7. Deformed Substructures in Fine-Grained Tetragonal Zirconia, K. Morita and K. Hiraga, Philos. Mag. Lett., 81 (2001), 311-319.
  8. Superplasticity in Alumina Enhanced by Co-dispersion of 10% Zirconia and 10% Spinel Particles, B.-N. Kim, K. Hiraga, K. Morita and Y. Sakka, Acta Mater., 49 (2001), 887-895.
  9. Simulation of Diffusional Creep Accompanied by Grain Growth in Two-Dimensional Polycrystalline Solids, B.-N. Kim and K. Hiraga, Acta Mater, 48 (2000), 4151-4159.
  10. Sintering and Ionic Conductivity of CuO-Doped Tetragonal ZrO2 Prepared by Novel Colloidal Processing, Y. Sakka, T. S. Suzuki, K. Ozawa, T. Uchikoshi and K. Hiraga, J. Ceram. Soc. Jpn., 109 (2001), 1004-1009.
  11. Colloidal Processing and Ionic Conductivity of Fine-Grained Cupric-Oxide-Doped Tetragonal Zirconia, Y. Sakka, K. Ozawa, T. Uchikoshi and K. Hiraga, J. Am. Ceram. Soc., 84 (2001), 2129-2131.
  12. Effect of Ultrasonication on the Microstructure and Tensile Elongation of Zirconia-Dispersed Alumina Ceramics Prepared by Colloidal Processing, T. S. Suzuki, Y. Sakka, K. Nakano and K. Hiraga, J. Am. Ceram. Soc., 84 (2001), 2132-2134.

Proceedings

2005

  1. Role of Deformable Fine Spinel Particles in High-Strain-Rate Superplastic Flow of Tetragonal ZrO2, K. Morita, K. Hiraga, B.-N. Kim and Y. Sakka, MRS Symposium Proc., 821 (2005), 277-282.

2003

  1. Creep Behavior of 3mol%-Y2O3-Stabilized Tetragonal ZrO2, K. Morita, K. Hiraga and Y. Sakka, CIMTEC 2002-10th International Ceramics Congress, (2003), 799-806.
  2. Two Dimentional Simulation of Superplastic Deformation, B.-N. Kim and K. Hiraga, CIMTEC 2002-10th International Ceramics Congress, (2003).
  3. Tensile Failure due to Cavity-Damage Accumulation in Superplastic Alumina, K. Hiraga, Y. Sakka, T. S. Suzuki and T. Tanabe, Proc. 9th Int. Conf. On the Mechanical Behabiour of Materials. Geneva, Switzerland, May 25-29, (2003).

2000

  1. Creep deformation in a 3mol%-Y2O3-Stabilized Tetragonal Zirconia, K. Morita, K. Hiraga and Y. Sakka, MRS Symposium Proc., 601 (2000), 93.


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