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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Structure and mechanical properties of swift heavy ion irradiated tungsten-bearing delta-phase oxides Y _6W _1O _(12) and Yb _6W _1O _(12) (Conference Paper)
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Structure and mechanical properties of swift heavy ion irradiated tungsten-bearing delta-phase oxides Y _6W _1O _(12) and Yb _6W _1O _(12) (Conference Paper)

机译：快速重离子辐照的含钨δ相氧化物Y _6W _1O _（12）和Yb _6W _1O _（12）的结构和力学性能（会议论文）

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摘要

We report on the relationship between structure and mechanical properties of complex oxides whose structures are derivatives of fluorite, following irradiation with swift heavy ion (92 MeV Xe) which approximately simulates fission product irradiation, where the electronic energy loss dominates. The two compounds of interest in this paper are Y _6W _1O _(12) and Yb _6W _1O _(12). These compounds possess an ordered, fluorite derivative crystal structure known as the delta (δ) phase, a rhombohedral structure belonging to space group R3?. Structural changes induced by irradiation were examined using X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD investigations indicated an irradiation-induced amorphization in these compounds. This result is consistent with our previous study on Y _6W _1O _(12) under displacive radiation environment in which the nuclear energy loss is dominant. High resolution TEM also revealed that individual ion tracks was amorphized. The mechanical properties of both irradiated compounds, were determined by cross-sectional nano-indentation measurements as a function of ion penetration depth. The decreases in Young's modulus, E, and hardness, H (both by about 40% at the irradiated surface) suggest amorphization beyond simple defect accumulation occurs under this irradiation condition.
机译：我们报告了结构快速变化的重离子（92 MeV Xe）辐照后，复合氧化物的结构为萤石衍生物的复合氧化物的结构与机械性能之间的关系，该重离子近似模拟裂变产物的辐照，其中电子能量损失占主导地位。本文关注的两个化合物是Y _6W _1O _（12）和Yb _6W _1O _（12）。这些化合物具有被称为δ（δ）相的有序萤石衍生物晶体结构，属于空间群R3′的菱面体结构。使用X射线衍射（XRD）和透射电子显微镜（TEM）检查了由辐照引起的结构变化。 XRD研究表明这些化合物中辐射诱导的非晶化。这一结果与我们先前在核能损失占主导地位的位移辐射环境下对Y _6W _1O _（12）的研究一致。高分辨率TEM还显示，单个离子轨迹已非晶化。通过横截面纳米压痕测量确定了两种辐照化合物的机械性能，它们是离子渗透深度的函数。杨氏模量E和硬度H的降低（在被辐照的表面两者都降低约40％）表明在该辐照条件下发生了超出简单缺陷累积的非晶化。

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