Crystal and metal/oxide interface structures of nanoparticles in Fe-16Cr-0.1Ti-0.35Y2O3 ODS steel
Crystal and metal/oxide interface structures of nanoparticles in Fe-16Cr-0.1Ti-0.35Y2O3 ODS steel
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Fe-16Cr-0.1Ti-0.35Y2O3 ODS 钢中纳米颗粒的晶体和金属/氧化物界面结构
DOI：
10.1016/j.jnucmat.2019.05.015
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发表时间：
2019-09-01
影响因子：
3.1
通讯作者：
Kimura, Akihiko
中科院分区：
文献类型：
--
作者：
Dou, Peng;Qiu, Lanlan;Kimura, Akihiko
氧化物弥散强化（ODS）钢是第四代核裂变反应堆包壳和未来聚变堆包层的最有前途的候选结构材料之一，因为它具有优异的抗蠕变、抗辐照、抗腐蚀性能，而且由于纳米级氧化物的高密度，具有很强的氦管理能力。用高分辨透射电镜（HRTEM）研究了Fe-16 Cr-0.1Ti-0.35Y（2）O（3）ODS钢中纳米颗粒的晶体结构和金属/氧化物界面结构。79个纳米颗粒，具有4-9 nm的直径和峰值数分数，因此，代表的氧化物贡献最显着的ODS钢的宏观性能的相，被确定，而且，各种类型的氧化物的比例进行了测定。约59.5%的纳米颗粒由Y-Ti复合氧化物组成。少量的Ti添加，即，0.1重量百分比，加入0.35 wt.%的Fe-Cr ODS钢Y2 O3，此外，低得多的过量氧含量促使正交和六方Y2 TiO 5（45.6%），而不是立方Y2 Ti 2 O 7（2.5%）的显着形成。在Fe-Cr-Ti-Y_2 O_3 ODS钢中首次发现了正交相YTi_2O_6（2.5%）和四方相YCrO_4（7.6%）氧化物。几乎所有的纳米颗粒都与bcc钢基体共格或半共格。确定了氧化物和基体的晶体学取向相关性。根据所建立的数据库，讨论了ODS钢中各种氧化物的形成和多晶型转变机理，以及ODS钢异常强化、热稳定性和耐辐照性的原因。(C)2019爱思唯尔B. V.保留所有权利。
Oxide dispersion strengthened (ODS) steel is one of the most promising candidate structural materials for the cladding of generation IV nuclear fission reactors and the blanket of future fusion reactors because it has excellent resistance to creep, irradiation, corrosion and, moreover, strong capability for managing helium due to the ultrahigh density nanometer-scale oxides. Crystal and metal/oxide interface structures of the nanoparticles in Fe-16Cr-0.1Ti-0.35Y(2)O(3) ODS steel have been studied by high resolution transmission electron microscopy (HRTEM). The phases of 79 nanoparticles, which have diameter of 4-9 nm and peak number fraction and, therefore, represent the oxides contributing most significantly to the macroscopic properties of the ODS steel, were identified and, moreover, the proportions of various types of oxides were determined. About 59.5% of the nanoparticles are composed of Y-Ti complex oxides. Small amount of Ti addition, i.e., 0.1 wt.%, into Fe-Cr ODS steel with 0.35 wt.% Y2O3 and, moreover, the much lower content of excess oxygen prompts the significant formation of orthorhombic and hexagonal Y2TiO5 (45.6%), instead of cubic Y2Ti2O7 (2.5%). Orthorhombic YTi2O6 (2.5%) and tetragonal YCrO4 (7.6%) oxides were firstly found in Fe-Cr-Ti-Y2O3 ODS steel. Almost all the nanoparticles are either coherent or semi-coherent with the bcc steel matrix. The crystallographic orientation correlations of the oxides and matrix were determined. The mechanisms of the formation and polymorphic transition of various kinds of oxides and, moreover, the reasons of the unusual strengthening, thermal stability and radiation tolerance of the ODS steel were discussed based on the comprehensive database developed here. (C) 2019 Elsevier B.V. All rights reserved.