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首页> 外文会议>The 3rd International Symposium on Material Chemistry in Nuclear Environment (Material Chemistry '02 MC'02) Mar 13-15, 2002 Tsukuba >MECHANICAL CHARACTERIZATION OF MAGNESIUM ALUMINATE MgO · nAl_2O_3 SPINEL SINGLE CRYSTALS IRRADIATED WITH Cu~- IONS
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MECHANICAL CHARACTERIZATION OF MAGNESIUM ALUMINATE MgO · nAl_2O_3 SPINEL SINGLE CRYSTALS IRRADIATED WITH Cu~- IONS

机译：铜离子辐照的铝酸镁MgO·nAl_2O_3尖晶石单晶的机械表征

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摘要

Ion-irradiation response of spinel single crystals was investigated using a nanoindentation technique. Specimens of stoichiometric (n=1) and non-stoichiometric (n=2.4) single crystals of MgO n(Al_2O_3) spinel were irradiated with 60keV Cu~- ion at room temperature. Dose rate ranged from 1 to 100 μA/cm~2, and a total dose was kept constant at 3x10~(16) ions/cm~2. Both plastic hardness and elastic modulus of all the irradiated specimens were softened. Radiation-induced swelling simultaneously occurred. Rutherford back scattering spectroscopy detected disordering of spinel crystalline structure. Accordingly, the radiation-induced softening and swelling are ascribed to accumulation of point defects associated with the disordering. In comparison between the stoichiometric and the non-stoichiometric specimens, the radiatioin-induced softening is suppressed in the non-stoichiometric composition.
机译：使用纳米压痕技术研究了尖晶石单晶的离子辐照响应。在室温下，用60keV Cu-离子辐照MgO n（Al_2O_3）尖晶石的化学计量（n = 1）和非化学计量（n = 2.4）单晶的样品。剂量率范围为1至100μA/ cm〜2，总剂量保持恒定在3x10〜（16）离子/ cm〜2。所有辐照样品的塑性硬度和弹性模量均被软化。辐射引起的肿胀同时发生。卢瑟福反向散射光谱检测到尖晶石晶体结构无序。因此，辐射引起的软化和膨胀归因于与无序相关的点缺陷的积累。在化学计量的样品和非化学计量的样品之间进行比较，在非化学计量的组合物中辐射引起的软化被抑制。

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