Flux dependence of cluster formation in neutron-irradiated weld material

被引：34

作者：

Bergner, F. ^{[1
]}

Ulbricht, A. ^{[1
]}

Hein, H. ^{[2
]}

Kammel, M. ^{[3
]}

机构：

[1] Forschungszentrum Dresden Rossendorf, D-01314 Dresden, Germany

[2] AREVA NP, D-91058 Erlangen, Germany

[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 10期

关键词：

D O I：

10.1088/0953-8984/20/10/104262

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The effect of neutron flux on the formation of irradiation-induced clusters in reactor pressure vessel (RPV) steels is an unresolved issue. Small-angle neutron scattering was measured for a neutron-irradiated RPV weld material containing 0.22 wt% impurity Cu. The experiment was focused on the influence of neutron flux on the formation of irradiation-induced clusters at fixed fluence. The aim was to separate and tentatively interpret the effect of flux on the characteristics of the cluster size distribution. We have observed a pronounced effect of neutron flux on cluster size, whereas the total volume fraction of irradiation-induced clusters is insensitive to the level of flux. The result is compatible with a rate theory model according to which the range of applied fluxes covers the transition from a flux-independent regime at lower fluxes to a regime of decelerating cluster growth. The results are confronted with measured irradiation-induced changes of mechanical properties. Despite the observed flux effect on cluster size, both yield stress increase and transition temperature shift turned out to be independent of flux. This is in agreement with the volume fraction of irradiation-induced clusters being insensitive to the level of flux.

引用

页数：6

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