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Radiation damage effects in superplastic 3Y-TZP irradiated with Zr ions

Zrイオンを照射した超塑性3Y-TZPの照射損傷効果

本橋 嘉信*; 小林 友和*; Harjo, S.*; 佐久間 隆昭*; 柴田 大受; 石原 正博; 馬場 信一; 星屋 泰二

Motohashi, Yoshinobu*; Kobayashi, Tomokazu*; Harjo, S.*; Sakuma, Takaaki*; Shibata, Taiju; Ishihara, Masahiro; Baba, Shinichi; Hoshiya, Taiji

3Y-TZP(3mol%イットリア含有正方晶ジルコニア多結晶体)セラミックスに130MeVのZr$$^{11+}$$イオンを、日本原子力研究所東海研究所のTANDEM加速器を用いて照射した。照射量は3.5$$times$$10$$^{16}$$及び2.1$$times$$10$$^{17}$$ions/m$$^{2}$$であった。照射によって生じた残留応力と機械的特性の変化、さらにその後の焼鈍効果について調べた。照射後の試験片表面について、残留圧縮応力の発生及び硬さと破壊靭性の増加が観察された。その後に実施した焼鈍では、これらの物性は焼鈍温度の増加に伴い徐々に低下し、1173K付近では非照射状態の値に戻った。硬さと破壊靱性の増加の主たる原因は、照射表面に生じた残留圧縮応力であると考えられる。

The 3mol% yttria containing tetragonal zirconia polycrystals(3Y-TZP) were irradiated using 130MeV Zr$$^{11+}$$ ions in the TANDEM accelerator facility at Tokai Research Establishment, JAERI. Irradiation was performed with the fluence of 3.5$$times$$10$$^{16}$$ and 2.1$$times$$10$$^{17}$$ ions/m$$^{2}$$. Residual stress and changes in mechanical properties caused by the ion irradiation and the effects of the subsequent annealing are studied. The occurrence of compressive residual stresses and increases in hardness and fracture toughness were found at the surface regions of as-irradiated specimens. It was found from the subsequent annealing that these quantities decreased gradually with raising the annealing temperature and returned to that of un-irradiated state at around 1173K. A most probable cause of the increases in the hardness and fracture toughness after the irradiation may, therefore, be the residual compressive stresses left in the irradiated surface region.

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