材料科学
辐射损伤
焦绿石
无定形固体
退火(玻璃)
渗透(认知心理学)
微晶
再结晶(地质)
渗流理论
渗流阈值
体积分数
复合材料
辐照
凝聚态物理
结晶学
冶金
化学
电导率
电阻率和电导率
物理化学
核物理学
物理
古生物学
神经科学
有机化学
生物
量子力学
相(物质)
作者
Tobias Beirau,N. Huber
摘要
Finite element mechanical modeling is used to follow the evolution of the hardness (H), Young's modulus (E), and Poisson's ratio (ν) during the radiation-damage related crystalline-to-amorphous transition in pyrochlore (average main composition Ca2Nb2O6F). According to the model, two percolation transitions have been identified around 16% and 84% amorphous volume fraction, respectively. In this context, earlier results from thermally induced recrystallization experiments have found to indicate noticeable modifications on the short- and long-range order by passing the percolation thresholds. Both percolation points have found to act as specific kinetic barriers during stepwise annealing induced structural reorganization. As phases with pyrochlore structure have been considered as host structures for the long-term disposal of actinides, it is essential to gain better knowledge of their mechanical behavior under radiation-damage and subsequent temperature treatment. The obtained results validate the used models' robustness in predicting radiation-damage related mechanical modifications, at least for ceramics.
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