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首页> 外文期刊>Philosophical Magazine Letters >A high-resolution electron microscopy study of copper precipitation in Fe-l-5wt% Cu under electron irradiation
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A high-resolution electron microscopy study of copper precipitation in Fe-l-5wt% Cu under electron irradiation

机译：电子辐照下Fe-1-5wt％Cu中铜沉淀的高分辨率电子显微镜研究

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摘要

High-resolution electron microscopy has been used to study the structure of copper-rich precipitates in an Fe-l>5wt%Cu alloy irradiated at 295°C with 2-5 MeV electrons to a dose of 3-1 X 1023m-2 (1-4 X 10-3 (displacements per atom (dpa)) at a dose rate of 4-1 X 1017m-2s-1 (2X 10-9dpas-1). Most of if not all the precipitates smaller than about 8 nm in diameter were found to have a twinned 9R structure similar to that seen in thermally aged model alloys. Some precipitates larger than about 8nm in diameter appeared to have transformed wholly or partly to 3R or f.c.c. The results confirm that the usual assumption that the main effect of irradiation is to enhance the diffusion of copper, and hence to accelerate the diffusion kinetics, is substantially correct. The smaller size at which the 9R-3R-f.c.c. transformation seems to occur under irradiation may be due to incorporation of vacancies in the precipitates or to nucleation of small dislocation loops at the precipitate-matrix interface, either of which may modify the critical size at which the 9R-3R transformation is triggered.
机译：高分辨率电子显微镜已用于研究Fe-1> 5wt％Cu合金中的富铜沉淀物的结构，该合金在295°C下用2-5 MeV电子辐照，剂量为3-1 X 1023m-2（ 1-4 X 10-3（每原子位移（dpa）），剂量率为4-1 X 1017m-2s-1（2X 10-9dpas-1），大部分（如果不是全部）沉淀物都小于约8 nm发现直径为9R的孪晶结构与热时效模型合金相似，某些直径大于8nm的沉淀似乎全部或部分转变为3R或fcc。辐照的时间是为了增强铜的扩散，从而加快扩散动力学，基本上是正确的，在辐照下似乎发生9R-3R-fcc转变的尺寸较小，可能是由于沉淀物中掺入了空位或在沉淀物-基质界面处的小位错环成核它可能会修改触发9R-3R转换的临界大小。

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