Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy
Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy
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DOI：
10.1016/j.jnucmat.2019.151852
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发表时间：
2020-01-01
影响因子：
3.1
通讯作者：
Moody, Michael P.
中科院分区：
文献类型：
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作者：
Auger, Maria A.;Hoelzer, David T.;Moody, Michael P.
在这项工作中，用原子探针断层扫描（APT）表征了一种高级氧化物弥散强化（ODS） 14YWT铁素体合金（SM13热）的纳米级微观结构，其标称成分为Fe-14Cr-3W-0.4Ti-0.3Y(2)O(3) (wt. %)，在450℃、总剂量为21 dpa的70 MeV Fe9+离子照射前后。APT数据的详细溶质聚类分析表明，在制造过程中，相对于晶粒内部的纳米颗粒，在晶界内或晶界附近形成了更大的纳米颗粒。辐照后纳米颗粒的演化似乎与它们的位置有关，因为在晶界或接近晶界处观察到纳米颗粒的数量密度和Y:Ti比的较高增加。APT分析还显示辐照增强了Cr、W和C向晶界的偏析。先前对同一合金在辐照前后的研究报告表明，机械性能似乎没有受到影响，但微观结构没有得到证实。本研究证实了14YWT合金辐照后的微观组织变化很小，表明在给定的辐照条件下具有容忍度。(C) 2019 Elsevier B.V.版权所有
In this work, the nanoscale microstructure of an advanced oxide dispersion strengthened (ODS) 14YWT ferritic alloy (SM13 heat) with nominal composition Fe-14Cr-3W-0.4Ti-0.3Y(2)O(3) (wt. %) has been characterized by atom probe tomography (APT) before and after ion irradiation with 70 MeV Fe9+ ions at 450 degrees C to a total dose of 21 dpa. A detailed solute cluster analysis of APT data reveals that, in the manufacturing process, larger nanoparticles form in or close to the grain boundaries respective to those inside grains. The evolution of the nanoparticles after irradiation seems to be related to their location, as a higher increase in the number density and in the Y:Ti ratio is observed for the nanoparticles in or close to grain boundaries. APT analysis also shows Cr, W and C segregation to grain boundaries enhanced by the irradiation. A previous study of this same alloy before and after irradiation reports that the mechanical properties do not seem to be affected, but the microstructure was not investigated to confirm. The present work confirms little microstructural evolution after irradiation in this 14YWT alloy, indicating tolerance at the given irradiation conditions. (C) 2019 Elsevier B.V. All rights reserved.