Simulating radiation damage in a bcc Fe system with embedded yttria nanoparticles
Simulating radiation damage in a bcc Fe system with embedded yttria nanoparticles
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DOI：
10.1016/j.jnucmat.2013.02.016
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发表时间：
2013-06
影响因子：
3.1
通讯作者：
T. Lazauskas;S. Kenny;Roger Smith;G. Nagra;Manan Dholakia;M. C. Valsakumar
中科院分区：
文献类型：
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作者：
T. Lazauskas;S. Kenny;Roger Smith;G. Nagra;Manan Dholakia;M. C. Valsakumar
我们提出了一个分子动力学研究的辐射损伤所产生的核碰撞接近嵌入式氧化钇纳米粒子的体心立方铁矩阵。该模型假设一个完美的体心立方（bcc）铁基体中，氧化钇纳米颗粒嵌入作为一个简化的模型的氧化物弥散强化钢。它示出了纳米粒子如何与附近发起的碰撞级联相互作用，通过级联阻塞和吸收能量。Fe缺陷在界面处积累，既直接来自弹道碰撞，也通过附近产生的缺陷的吸引。纳米颗粒通常在辐射事件期间保持完整，并在比碰撞级联的弹道阶段更长的时间内释放吸收的能量。
We present a molecular dynamics study of radiation damage arising from nuclear collisions close to embedded yttria nanoparticles in a bcc Fe matrix. The model assumes a perfect body-centred cubic (bcc) iron matrix in which yttria nanoparticles are embedded as a simplified model of an oxide dispersion strengthened steel. It is shown how the nanoparticles interact with nearby initiated collision cascades, through cascade blocking and absorbing energy. Fe defects accumulate at the interface both directly from the ballistic collisions and also by attraction of defects generated close by. The nanoparticles generally remain intact during a radiation event and release absorbed energy over times longer than the ballistic phase of the collision cascade.