Iron redistribution in a zirconium alloy after neutron and proton irradiation studied by energy-dispersive X-ray spectroscopy (EDX) using an aberration-corrected (scanning) transmission electron microscope
Iron redistribution in a zirconium alloy after neutron and proton irradiation studied by energy-dispersive X-ray spectroscopy (EDX) using an aberration-corrected (scanning) transmission electron microscope
复制标题
使用像差校正（扫描）透射电子显微镜通过能量色散 X 射线光谱 (EDX) 研究中子和质子辐照后锆合金中铁的重新分布
DOI：
10.1016/j.jnucmat.2014.08.034
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发表时间：
2014
影响因子：
3.1
通讯作者：
Francis E
中科院分区：
文献类型：
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作者：
Francis E
作为核反应堆包层材料的锆合金在持续的中子辐照后，会表现出加速的辐照诱导生长，通常被称为线性生长。这一现象与组元位错环的形成和间隙溶质原子的集中有关。对于Zircaloy来说，铁在辐照过程中从第二相粒子(SPP)中溶解，从而增加了基质中的间隙溶质浓度，这是有充分证据的。然而，在理解较新的ZIRLO™合金是否发生类似过程方面尚未取得任何进展。为了克服这一缺陷，我们利用能量色散X射线能谱(EDX)研究了低锡ZIRLO™中第二相粒子在中子和质子辐照后的成分变化。研究了用中子辐照到18dpa(每原子的位移)，用质子辐照到2.3dpa和7dpa的材料。结果表明，在中子和质子辐照过程中，Zr-Nb-Fe-SPP中都有Fe的损失。辐照前，β-Nb-SPPS界面处有铁的存在。这种铁的富集物在辐照过程中也会分散。定性上，在质子和中子辐照后观察到的元素再分布过程中发现了很好的一致性。
Zirconium alloys used as cladding materials in nuclear reactors can exhibit accelerated irradiation induced growth, often termed linear growth, after sustained neutron irradiation. This phenomenon has been linked to the formation of <c>-component dislocation loops and to the concentration of interstitial solute atoms. It is well documented for the Zircaloys that Fe dissolves from second phase particles (SPPs) during irradiation thus increasing the interstitial solute concentration in the matrix. However, no progress has yet been made into understanding whether a similar process occurs for the newer ZIRLO™ alloys. We aim to overcome this shortcoming here by studying compositional changes in second phase particles in Low Tin ZIRLO™ after neutron and proton irradiation using energy dispersive X-ray (EDX) spectroscopy. Material irradiated to 18 dpa (displacements per atom) using neutrons and to 2.3 and 7 dpa by protons was investigated. The results show that Fe is lost from Zr–Nb–Fe-SPPs during both neutron and proton irradiation. Prior to irradiation, Fe was detected at the interface of β-Nb-SPPs. This Fe enrichment is also dispersed during irradiation. Qualitatively, excellent agreement was found regarding the elemental redistribution processes observed after proton and neutron irradiation.