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Temperature-dependent helium induced microstructural evolution in equiatomic NiCo and NiFe concentrated solid solution alloys
Journal of Nuclear Materials ( IF 3.1 ) Pub Date : 2020-12-04 , DOI: 10.1016/j.jnucmat.2020.152715
Shaofei Liu , Da Chen , Shijun Zhao , Weitong Lin , Fanling Meng , Yilu Zhao , Guma Yeli , Feng He , Yiran Li , Huan Niu , Ji-jung Kai

Irradiation temperature and the species of elemental constituents are two pivotal factors in determining the helium (He) radiation behaviors. However, their synergistic effect on the He-induced defect evolution in single-phase concentrated solid-solution alloys (SP-CSSAs) has rarely been studied. In this work, the evolution of He cavities and dislocation structural damages in two equiatomic SP-CSSAs, i.e., NiCo and NiFe, were investigated at 673 K, 773 K and 873 K with 275 keV He+ ions. He cavity formation behaviors were diverse at different temperature regimes. NiFe was found to have a stronger suppression effect on He cavity growth at 673 K. However, with the increasing temperature, a more pronounced increment of He cavity size was exhibited in NiFe. Unlike the evolution of He cavities, the growth of dislocation loops tends to be delayed in NiFe over the studied irradiation temperatures. The underlying mechanisms for the temperature-dependent defect evolution in NiCo and NiFe are discussed.



中文翻译:

等温NiCo和NiFe固溶合金中温度依赖性氦气诱导的组织演变

辐射温度和元素组成的种类是确定氦(He)辐射行为的两个关键因素。然而,很少研究它们对单相浓缩固溶合金(SP-CSSAs)中He诱导的缺陷演变的协同作用。在这项工作中,在275 keV He +下,分别在673 K,773 K和873 K上研究了两个等原子SP-CSSA(即NiCo和NiFe)中He腔的演化和位错结构损伤。离子。在不同温度下,空穴的形成行为各不相同。发现在673 K时,NiFe对He腔的生长具有更强的抑制作用。但是,随着温度的升高,NiFe中He腔尺寸的增加更为明显。与He腔的演化不同,NiFe的位错环的生长在所研究的辐照温度范围内趋于延迟。讨论了NiCo和NiFe中与温度有关的缺陷演变的潜在机理。

更新日期:2020-12-20
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