FeCrAl oxide dispersion strengthened (ODS) steel is one of the most promising candidate cladding materials of generation IV nuclear reactors because of its excellent resistance to not only corrosion but also creep and irradiation due to the ultrahigh density nanometer-scale oxides. Effects of the contents of Al, Zr and Ti on the crystal and metal/oxide interface structures of the particles in Fe–15Cr–3.7Al–2W–0.1Ti–0.6Zr–0.35Y₂O₃ (3.7Al–0.1Ti–0.6Zr) and Fe–15Cr–3.8Al–2W–0.12Ti–0.5Zr–0.35Y₂O₃ (3.8Al–0.12Ti–0.5Zr) were studied by high resolution transmission electron microscopy (HRTEM). For 3.7Al–0.1Ti–0.6Zr and 3.8Al–0.12Ti–0.5Zr ODS steels, phase identification was accomplished on 175 and 213 particles, respectively, which have peak number fraction and, therefore, represent the oxides contributing most significantly to the macroscopic properties of the ODS steels. The proportions of various types of oxides were determined. For 3.7Al–0.1Ti–0.6Zr and 3.8Al–0.12Ti–0.5Zr ODS steels, the proportions of Y–Zr complex oxides are ∼87.4% and ∼54.4% while the number fractions of Y–Al complex oxides are ∼3.5% and ∼5.2%, respectively, indicating that 0.5–0.6 wt% Zr inhibits the formation of Y–Al complex oxides remarkably while prompts the significant occurrence of Y–Zr complex oxides. For 3.7Al–0.1Ti–0.6Zr and 3.8Al–0.12Ti–0.5Zr ODS steels, the proportions of Y–Ti complex oxides are ∼5.7% and ∼36.6%, respectively, indicating it is effective for increasing the proportion of Y–Ti complex oxides by increasing the content of Ti from 0.09 wt% to 0.12 wt% with the content of Zr decreased from 0.63 wt% to 0.49 wt%. The crystallographic orientation correlations of the oxides and matrix were determined. The formation and refinement mechanisms of oxides and, moreover, the reasons of the unusual irradiation tolerance and thermal stability of the ODS steel were discussed based on the results.

FeCrAl氧化物弥散强化（ODS）钢是IV核反应堆中最有希望的候选包层材料之一，因为它具有优异的耐腐蚀性，而且由于超高密度纳米级氧化物而具有出色的抗蠕变性和耐辐照性。Al，Zr和Ti的含量对Fe–15Cr–3.7Al–2W–0.1Ti–0.6Zr–0.35Y ₂ O ₃（3.7Al–0.1Ti– _3）中颗粒的晶体和金属/氧化物界面结构的影响0.6Zr）和Fe–15Cr–3.8Al–2W–0.12Ti–0.5Zr–0.35Y ₂ O ₃（3.8Al–0.12Ti–0.5Zr）通过高分辨率透射电子显微镜（HRTEM）进行了研究。对于3.7Al–0.1Ti–0.6Zr和3.8Al–0.12Ti–0.5Zr ODS钢，分别在175和213个具有峰数分数的颗粒上进行了相识别，因此代表了对Al贡献最大的氧化物。 ODS钢的宏观性能。确定了各种氧化物的比例。对于3.7Al–0.1Ti–0.6Zr和3.8Al–0.12Ti–0.5Zr ODS钢，Y–Zr复合氧化物的比例分别为〜87.4％和〜54.4％，而Y–Al复合氧化物的数量分数为〜3.5分别为％和5.2％，表明0.5-0.6 wt％的Zr显着抑制Y-Al复合氧化物的形成，同时促使Y-Zr复合氧化物的大量出现。对于3.7Al–0.1Ti–0.6Zr和3.8Al–0.12Ti–0.5Zr ODS钢，Y-Ti复合氧化物的比例分别为〜5.7％和〜36.6％，表明通过将Ti的含量从0.09 wt％增加到0.12 wt％，可以有效地提高Y-Ti复合氧化物的比例。 Zr的含量从0.63wt％降低到0.49wt％。确定了氧化物和基体的晶体取向相关性。基于这些结果，讨论了氧化物的形成和细化机理，以及ODS钢异常的耐辐照性和热稳定性的原因。确定了氧化物和基体的晶体取向相关性。基于这些结果，讨论了氧化物的形成和细化机理，以及ODS钢异常的耐辐照性和热稳定性的原因。确定了氧化物和基体的晶体取向相关性。基于这些结果，讨论了氧化物的形成和细化机理，以及ODS钢异常的耐辐照性和热稳定性的原因。