Microstructural stability of M5™ alloy irradiated up to high neutron fluences

被引:29
作者
Doriot, Sylvie [1 ]
Gilbon, Didier [1 ]
Bechade, Jean-Luc [1 ]
Mathon, Marie-Helene [1 ]
Legras, Lourent [1 ]
Mardon, Jean-Paul [1 ]
机构
[1] CEA Saclay, DEN, Serv Rech Met Appl, F-91191 Gif Sur Yvette, France
来源
ZIRCONIUM IN THE NUCLEAR INDUSTRY: 14TH INTERNATIONAL SYMPOSIUM | 2005年 / 1467卷
关键词
microstructure; precipitates; irradiation; dislocation loops; growth behavior;
D O I
10.1520/STP37507S
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The present paper is focused on the microstructural stability of the Framatome-ANP M5 (TM) (Zr-1%NbO) alloy. Thin foils were cut from M5 cladding tubes irradiated from 1 to 6 annual cycles in EDF PWRs, and examined by analytical transmission electron microscopy (TEM). The results show that Within the wide range of irradiation conditions investigated, the initial beta-Nb particles undergo no amorphisation and only minor evolutions in size distribution, number density, and composition. Finally, very few < c > component basal loops were detected, so that no sign of accelerated growth regime has to be feared for the fuel bum-ups currently considered (similar to 70 GWd/t) for PWRs. In the second part of this paper, other industrial or experimental alloys (Zy-4, M4, Zr-2.5%Nb, ZrNbSnFe) are considered to improve our knowledge about the irradiation-induced evolution of beta-Nb and other minor SPP. Thin foils were cut from specimens irradiated in PWRs or MTRs (OSIRIS, SILOE) and also examined by transmission electron microscopy. In addition, Small Angle Neutron Scattering (SANS) was used to provide quantitative and statistical information on the radiation-enhanced precipitation of beta-Nb needles and possible other defects or solute clusters. All these results allow a general discussion of evolution of SPP with regard to their initial structure and composition, and of the noteworthy irradiation stability of the M5 (TM) up to high neutron fluence with respect to other alloys.
引用
收藏
页码:175 / 201
页数:27
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