Irradiation-induced vacancy and Cu aggregations in Fe–Cu model alloys of reactor pressure vessel steels: state-of-the-art positron annihilation spectroscopy
Irradiation-induced vacancy and Cu aggregations in Fe–Cu model alloys of reactor pressure vessel steels: state-of-the-art positron annihilation spectroscopy
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DOI：
10.1080/02678370412331370215
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发表时间：
2005-02
影响因子：
1.6
通讯作者：
M. Hasegawa *;Z. Tang;Y. Nagai;T. Chiba;E. Kuramoto;M. Takenaka
中科院分区：
文献类型：
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作者：
M. Hasegawa *;Z. Tang;Y. Nagai;T. Chiba;E. Kuramoto;M. Takenaka
本文讨论了反应堆压力容器钢中Fe-Cu模型合金中与沉淀有关的正电子湮没现象的理论和实验研究。虽然正电子一般被认为对固体中的杂质不敏感，但我们证明了正电子可以作为量子点状态被限制在Fe-Cu模型合金中的纳米Cu或富Cu沉淀物中，这使得正电子湮没成为该领域最有前途的技术之一。用正电子探针研究了纳米Cu沉淀与Fe基体的共格结构。结果清楚地表明，量子点态正电子只探测沉淀物的微观结构和电子结构。
Theoretical and experimental aspects of positron annihilation studies of precipitate-relevant phenomena in Fe–Cu model alloys of reactor pressure vessel steels are discussed. Although the positrons are thought, in general, to be insensitive to the impurities in solids, we demonstrate that the positrons can be confined as a quantum-dot state within the nano Cu or Cu-rich precipitates in the Fe–Cu model alloys, which makes the positron annihilation one of the most promising techniques in this field. The positron probe is employed successfully to clarify that nano Cu precipitate has a bcc structure coherent with the Fe matrix. The results show clearly that the quantum-dot-state positrons exclusively detect the microscopic and electronic structures of the precipitates.