Effect of solute elements (Ni, Mn) in Fe-based alloys on dislocation loop evolution under Fe2+ ion irradiation

Effect of solute elements (Ni, Mn) in Fe-based alloys on dislocation loop evolution under Fe2+ ion irradiation
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Fe2离子辐照下铁基合金中溶质元素(Ni、Mn)对位错环演化的影响

DOI:
10.1016/j.jnucmat.2021.153489
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发表时间:
2022
影响因子:
3.1
通讯作者:
Chen Liang
Chen Liang
中科院分区:
工程技术2区
文献类型:
--
作者:
Prak Tom Phongsakorn;Murakami Kenta;Luu Vu Nhut;Nguyen Ba Vu Chinh;Chen Liang

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位错环是核反应堆压力容器用钢的一种辐照缺陷,它导致钢的硬化和伴随的脆化。在这项研究中,溶质元素,如镍和锰在铁基合金的位错环演化的影响进行了研究,使用离子辐照。用2.8MeV的Fe离子在400 °C下辐照纯Fe和Fe模型合金Fe-0.6Ni和Fe-0.6Ni-1.4Mn,峰值剂量为3个位移/原子(dpa)。利用透射电子显微镜(TEM)定量分析了位错环的演化。结果表明,铁合金中溶质元素的存在显着增加了位错环的数量密度,并略微降低了位错环的平均尺寸。两种类型的位错环,1/2<111>和<100>伯格斯矢量,在所有标本中观察到。溶质元素降低了1/2位错环的迁移率<111>,导致其数量密度增加,并限制了位错环的生长<100>。此外,在小尺寸的位错环的数量密度的增加<100>被发现与较高的溶质含量。
The dislocation loop is known as one of the irradiation defects that contributes to hardening and accompanying embrittlement in reactor pressure vessel steels. In this study, the effect of solute elements such as Ni and Mn in Fe-based alloys on dislocation loop evolution was investigated using ion irradiation. Pure Fe and Fe model alloys, Fe-0.6Ni and Fe-0.6Ni-1.4Mn, were irradiated by 2.8 MeV Fe ions to a peak dose of 3 displacements per atom (dpa) at 400 °C. Quantitative analysis of transmission electron microscopy (TEM) was conducted to analyze the evolution of dislocation loops. As a result, the presence of solute elements in Fe alloys increased the number density of dislocation loops significantly and decreased their mean size slightly. Both types of dislocation loops, ½<111> and <100> Burgers vectors, were observed in all specimens. Solute elements reduced the mobility of ½<111> dislocation loops, resulting in an increase in their number density and restricting the growth of <100> dislocation loops. Furthermore, an increase in the number density of <100> dislocation loops of small size was found with higher solute contents.
反应堆压力容器钢 Fe(C)MnNi 模型合金辐照下纳米结构的演变
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