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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Vacancy-solute clustering in Fe-Cr alloys after neutron irradiation
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Vacancy-solute clustering in Fe-Cr alloys after neutron irradiation

机译：中子辐照后Fe-Cr合金中空位溶质聚类

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摘要

Vacancy-solute clustering in neutron irradiated Fe-Cr alloys with various concentrations of Cr and minor solutes (Ni, Si and P) were studied by using coincidence Doppler broadening spectroscopy and small angle neutron scattering techniques. The results from both experiments, supported by an object kinetic Monte Carlo model, show in a very consistent way the existence and formation of vacancy-CrNiSiP clusters that play detrimental role in irradiation hardening. Similar solute cluster number density of about 30-50 x 10(16) cm(-3) and an average diameter of about 1 nm were estimated for all alloys containing minor solutes, irrespectively of the chromium content. In Fe9Cr ferritic and Fe9Cr ferritic/martensitic alloys, with significantly reduced concentration of minor solute elements, the main defects are vacancy clusters, with an average cluster size of about 10 and 2 vacancies, respectively. Large concentration of alpha'-precipitates was observed in Fe14Cr(NiSiP). However, both vacancy clusters and alpha'-precipitates provide significantly less impact to hardening in comparison to vacancy-CrNiSiP clusters. The fact that vacancy clustering in Fe9Cr ferritic alloy resembles that of pure iron suggests that Cr solutes may play lesser role in irradiation hardening of ferritic alloys and steels than previously believed. (C) 2020 Elsevier B.V. All rights reserved.
机译：通过使用重合多普勒展宽光谱和小角度中子散射技术，研究了中子辐照的FE-CR合金中中子辐照的FE-CR合金的空位溶质聚类。由对象动力学蒙特卡罗模型支持的两种实验的结果以一种非常一致的方式显示空缺 - CRNISIP簇的存在和形成，这些簇在照射硬化中发挥不利作用。对于所有含有轻微溶质的合金，据估计了约30-50×10（16）厘米（-3）的相似溶质簇数密度和约1nm的平均直径，而不管含铬含量。在FE9CR铁素体和FE9CR铁素体/马氏体合金中，少量溶质元素的浓度显着降低，主要缺陷是空位簇，平均簇大小为约10和2个空位。在Fe14CR（NISIP）中观察到大浓度的α-沉淀物。然而，与空位-Crnisip簇相比，空位簇和α-沉淀物对硬化的影响显着较小。 Fe9cr铁素体合金中空位聚类的事实类似于纯铁表明Cr溶质可能在铁素体合金和钢的照射硬化中发挥较小的作用。 （c）2020 Elsevier B.v.保留所有权利。

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