Defect clusters formed from large collision cascades in fcc metals irradiated with spallation neutrons
Defect clusters formed from large collision cascades in fcc metals irradiated with spallation neutrons
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DOI：
10.1016/j.jnucmat.2013.01.319
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发表时间：
2013-11
影响因子：
3.1
通讯作者：
Y. Satoh;Y. Matsuda;T. Yoshiie;M. Kawai;H. Matsumura;H. Iwase;H. Abe;Sawoong Kim;T. Matsunaga
中科院分区：
文献类型：
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作者：
Y. Satoh;Y. Matsuda;T. Yoshiie;M. Kawai;H. Matsumura;H. Iwase;H. Abe;Sawoong Kim;T. Matsunaga
在高能加速器研究组织（KEK），在室温下用散中子（能量高达500 MeV）辐照面心立方纯金属，中子注量为1 × 1018 n m− 2。利用透射电子显微镜（TEM）研究了大碰撞级联引起的缺陷团簇。在Au中，大的缺陷群包括10个以上的团簇，并且损伤区延伸超过50 nm，这大于聚变中子辐照诱导的损伤区（<20 nm）。虽然小的堆垛层错四面体（SFT）形成的子级联裂变和聚变中子照射，位错环也观察到在本实验中。通过传统的内外对比法将大的位错环（>10 nm）鉴定为空位型。由于中子注量低，碰撞级联的空间重叠被忽略。在具有较大反冲能的单个碰撞级联中，通过子级联之间的协同反应形成大的空位环。
Fcc pure metals were irradiated with spallation neutrons (energies up to 500 MeV) at room temperature to a neutron fluence of 1 × 1018n m−2at KENS, High Energy Accelerator Research Organization (KEK). Defect clusters induced by large collision cascades were examined using transmission electron microscopy (TEM). In Au, large groups of defects included more than 10 clusters, and the damage zone extended over 50 nm, which was larger than that induced by fusion neutron irradiation (<20 nm). Although small stacking fault tetrahedra (SFT) are formed in subcascades by fission and fusion neutron irradiation, dislocation loops were also observed in the present experiments. Large dislocation loops (>10 nm) were identified as vacancy type by the conventional inside–outside contrast method. Because of the low neutron fluence, spatial overlapping of collision cascades was ignored. Large vacancy loops are formed through cooperative reactions among subcascades in a single collision cascade with large recoil energy.