Study on microstructure and mechanical properties of zirconium hydride for improvemnent of cladding assessment

• Project/Area Number: 26420871
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Osaka University
• Principal Investigator: MUTA Hiroaki 大阪大学, 工学研究科, 准教授 (60362670)
• Co-Investigator(Renkei-kenkyūsha): YAMANAKA Shinsuke 大阪大学, 大学院工学研究科, 教授 (00166753)
• Research Collaborator: MATSUNAGA Junji 株式会社グローバル, ニュークリア・フュエル
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 水素化物 / 燃料被覆管 / ジルコニウム水素化物 / EBSD観察

Outline of Final Research Achievements

Non-cracked zirconium hydride samples were fabricated in Sievert's apparatus. The activation and hydrogenation temperature were carefully controlled with consideration of the volume change in the phase transformation. The crystal structure and microstructure were studied by neutron diffraction pattern analysis and EBSD observation. The Young's modulus and hardness were measured by the indentation test, and crystal orientation on the testing point was observed by EBSD.
The microstructure of hydride sample strongly depends on the fabrication condition. The hydride prepared from a-Zr displays significant stacking faults in the {111} plane and in the pseudo-layered microstructure. Strong crystal orientation dependence of mechanical properties were confirmed by the indentation test and EBSD observation.

Research Products

• [Presentation] Microstructure and mechanical properties of Zr hydrides (2016)
  • Author(s): R. Nishikane, H. Muta, Y. Ohishi, K. Kurosaki, S. Yamanaka, K. Sakamoto, J. Matsunaga, S. Harjo, T. Kawasaki
  • Organizer: NuMat2016: The Nuclear Materials Conference
  • Place of Presentation: フランス、モンペリエ
  • Year and Date: 2016-11-07
  • Int'l Joint Research
• [Presentation] EBSD analysis of A-EDC tested Zr-Nb alloy (2016)
  • Author(s): H. Muta, Z. Zishou, Y. Matsukawa, Y. Shinohara, H. Abe, Y. Ohishi, K. Kurosaki, S. Yamanaka
  • Organizer: NuMat2016: The Nuclear Materials Conference
  • Place of Presentation: フランス、モンペリエ
  • Year and Date: 2016-11-07
  • Int'l Joint Research
• [Presentation] Mechanical properties of Zirconium hydride (2015)
  • Author(s): Hiroaki Muta, Yusuke Ando, Ryoji Nishikane, Yuji Ohishi, Ken Kurosaki, Shinsuke Yamanaka
  • Organizer: 3rd Asian Zirconium Workshop
  • Place of Presentation: 福井大学附属国際原子力工学研究所（福井県敦賀市）
  • Year and Date: 2015-10-05
  • Int'l Joint Research
• [Presentation] Zr水素化物の微細組織観察と機械的特性評価 (2015)
  • Author(s): 西金遼二, 牟田浩明, 大石佑治, 黒崎 健, 山中伸介, 坂本 寛, 松永純3, Stefanus Harjo, 川崎卓郎
  • Organizer: 日本原子力学会
  • Place of Presentation: 静岡大学静岡キャンパス（静岡県静岡市）
  • Year and Date: 2015-09-09