Radiation-enhanced precipitation in FeCu(C) alloys studied by electron microscopy
Radiation-enhanced precipitation in FeCu(C) alloys studied by electron microscopy
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通过电子显微镜研究 FeCu(C) 合金中的辐射增强沉淀
DOI：
10.1093/oxfordjournals.jmicro.a023720
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Oshima
中科院分区：
文献类型：
--
作者：
F. Hori;A. Morita;R. Oshima
本研究旨在了解低合金反应堆压力容器钢在中子辐照环境中脆化过程的基本机理。以前认为，辐射环境可能导致韧脆转变温度的升高，这是由细Cu沉淀引起的。这可能是基于辐射诱导的点缺陷和铜原子之间的相互作用。为了研究辐射诱导缺陷对Cu沉淀的影响，对Fe和FeC合金进行了2.48 MeV的Cu ~（2+）离子注入后的透射电子显微镜和正电子湮没测量。FeCuC合金的原位观察也进行了超高压电子显微镜检查电子辐照过程中的Cu沉淀过程。结果表明，沉淀物的平均尺寸比纯铁中的大。这表明少量的C原子增强了Cu沉淀的生长过程。
This study is aimed at understanding the fundamental mechanism of the embrittlement process in low alloy, reactor pressure vessel steel in a neutron irradiation environment. It has previously been considered that the radiation environment may induce the increment of the ductile-brittle transition temperature, which is caused by the fine Cu-precipitation. This is probably based on the interaction between radiation-induced point defects and Cu atoms. In order to study the effect of radiation-induced defects on the Cu precipitation, transmission electron microscopy and positron annihilation measurements were carried out for Fe and FeC alloys after implanting Cu2+ions with 2.48 MeV. In situ observations of FeCuC alloys were also performed with an ultra-high voltage electron microscope to examine the Cu precipitation processes during electron irradiation. It was found that the mean size of the precipitate is larger than that in pure Fe. This suggests that the growth process of Cu precipitation is enhanced by a small amount of C atoms.