Nanostructural evolution in surveillance test specimens of a commercial nuclear reactor pressure vessel studied by three-dimensional atom probe and positron annihilation
Nanostructural evolution in surveillance test specimens of a commercial nuclear reactor pressure vessel studied by three-dimensional atom probe and positron annihilation
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DOI：
10.1016/j.actamat.2007.08.047
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发表时间：
2007-12-01
期刊：
影响因子：
9.4
通讯作者：
Gerard, R.
中科院分区：
文献类型：
--
作者：
Toyama, T.;Nagai, Y.;Gerard, R.
采用三维局域电极原子探针和正电子湮没技术，研究了在役商用核反应堆压力容器钢Doel-1和Doel-2焊缝辐照诱导富铜纳米沉淀物（CRNPs）和空位团簇的纳米结构演化。在两种介质中（0.13重量%）和高（0.30重量%）铜焊缝，CRNP被发现很容易形成在反应堆寿命的开始。此后，在随后的30年的运行中，在基质中的残留铜浓度略有下降，而CRNP粗化。另一方面，V-3-V-4的小空位团簇在初始Cu沉淀后开始出现，并随着中子剂量的增加而稳定地积累。所观察到的纳米结构的演变提供了独特的和基本的信息，这些特定的材料的辐射致脆化的机制。(c)2007 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The nanostructural evolution of irradiation-induced Cu-rich nanoprecipitates (CRNPs) and vacancy clusters in surveillance test specimens of in-service commercial nuclear reactor pressure vessel steel welds of Doel-1 and Doel-2 are revealed by combining the three-dimensional local electrode atom probe and positron annihilation techniques. In both medium (0.13 wt.%) and high (0.30 wt.%) Cu welds, the CRNPs are found to form readily at the very beginning of the reactor lifetime. Thereafter, during the subsequent 30 years of operation, the residual Cu concentration in the matrix shows a slight decrease while the CRNPs coarsen. On the other hand, small vacancy clusters Of V-3-V-4 start appearing after the initial Cu precipitation and accumulate steadily with increasing neutron dose. The observed nanostructural evolution is shown to provide unique and fundamental information about the mechanisms of the irradiation-induced embrittlement of these specific materials. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.