Abstract
The effects of Zr-ion irradiation on the superplastic deformation behavior of a 3 mol% yttria containing tetragonal zirconia polycrystals (3Y-TZP) were studied. The specimens were irradiated by Zr 11+ ions with 130 MeV at fluence levels of 3.5 × 10 12 and 2.1 × 10 13 ions/cm 2 in the TANDEM accelerator at Tokai Research Establishment of JAERI. The TRIM simulation indicated that the maximum irradiation damage emerged at the depth of about 10 μm. The mechanical and superplastic properties of the irradiated specimens were examined by the bending test at elevated temperatures. It was found that the activation energy for the superplastic deformation was increased with increasing the irradiation fluence. One of the possible causes of this increase is that excess Zr ions, implanted in the irradiation surface region, prevented the diffusion of constitutive ions and hence restrained diffusion controlled accommodation process for grain boundary sliding.
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