Microstructural control using transformation from metastable structure

• Project/Area Number: 22686070
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Metal making engineering
• Research Institution: Osaka University
• Principal Investigator: NAGIRA Tomoya 大阪大学, 大学院・工学研究科, 助教 (00379124)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000); Fiscal Year 2011: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000); Fiscal Year 2010: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
• Keywords: 相変態 / 準安定組織 / 過冷融液 / 過程融液 / 準安定共晶 / セラミックス

Research Abstract

The paper a ims to produce the new ceramics fabrication process through the transformation from the metastable to the equilibrium eutectic structure. The mechanism for the metastable/ equilibrium transformation was discussed based on a thermodynamic approach including the strain energy. In the eutectic system which has Al_2O_3 and perovskite and garnet phases, the effect of kinds of perovskite on the transformation was also examined The Ce doped eutectic casting was demonstrated to be used as a phosphor.

Research Products

• [Journal Article] Solidification of Al_2O_3-YAG Eutectic Composites with Off-metastable Eutectic Composition from undercooled melt produced by melting Al_2O_3-YAP eutectics (2012)
  • Author(s): Tomoya Nagira, Hideyuki Yasuda, Takumi Sakimura, Kentarou Yoshida
  • Journal Title: J. Eur. Cerm. Soc Volume: 32 Pages: 2137-2143
  • Peer Reviewed
• [Journal Article] Fabrication of Al_2O_3-YAG equilibrium eutectic composites via transformation from fine Al_2O_3 and YAP powder mixtures (2012)
  • Author(s): Tomoya Nagira and Hideyuki Yasuda
  • Journal Title: Materials Transactions Volume: Vol.53No.6 Pages: 1124-1129
  • NAID: 10030630255
  • Peer Reviewed
• [Journal Article] Solidification of Al_2O_3-YAG Eutectic Composites with Off-meta stable Eutectic Composition from undercooled melt produced by melting Al_2O_3-YAP eutectics (2012)
  • Author(s): Tomoya Nagira, Hideyuki Yasuda, Takumi Sakimura, Kentarou Yoshida
  • Journal Title: J.Euro.Ceram.Soc Volume: (印刷中) Issue: 10 Pages: 2137-2143
  • DOI: 10.1016/j.jeurceramsoc.2012.02.007
  • Peer Reviewed
• [Journal Article] Fabrication of Al_2O_3-YAG equilibrium eutectic composites via transformation from fine Al_2O_3 and YAP powder mixtures
  • Author(s): Tomoya Nagira, Hideyuki Yasuda
  • Journal Title: Materials Transactions Volume: (掲載決定)
  • NAID: 10030630255
  • Peer Reviewed
• [Presentation] 一方向凝固Al_2O_3-YAG共晶系に形成される粗大共晶組織の形成 (2011)
  • Author(s): 原広憲、柳楽知也、秦野了輔、安田秀幸、吉矢真人
  • Organizer: 日本金属学会
  • Place of Presentation: 沖縄コンベンションセンター、沖縄県宜野湾市
  • Year and Date: 2011-11-07
• [Presentation] 一方向Al_2O_3-YAG共晶系に形成される粗大共晶組織の形成 (2011)
  • Author(s): 原広憲、柳楽知也、秦野了輔、安田秀幸、吉矢真人
  • Organizer: 日本金属学会2011年秋期大会
  • Place of Presentation: 沖縄コンベンションセンター
  • Year and Date: 2011-11-07
• [Presentation] 3 D chain structure of unidirectionally solidified eutectic Al_2O_3-YAG-ZrO_2 ceramic composite (2010)
  • Author(s): Tomoya Nagira, Hideyuki Yasuda, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku, Kentaro Uesugi
  • Organizer: 7th International Conference on S ynchrotron Radiation in Materials Science(SRMS-7)
  • Place of Presentation: Oxford, U. K
• [Presentation] 3 D chain structure of unidirectionally solidified eutectic Al_2O_3-YAG-ZrO_2 ceramic composite (2010)
  • Author(s): Tomoya Nagira, Hideyuki Yasuda, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku, Kentaro Uesugi
  • Organizer: 7th International Conference on Synchrotron Radiation in Materials Science (SRMS-7)
  • Place of Presentation: Oxford, U.K
• [Remarks]
  • URL: http://www.mpd.ams.eng.osaka-u.ac.jp/nagira/