Zhang Weiping, Guo Liping, Shen Zhenyu, Xin Jingping, Huang Qunying, Wei Yaxia, Long Yunxiang, Zhou Xiong, Chen Cheng
Hubei Key Laboratory of Nuclear Solid Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
Materials (Basel). 2018 Nov 14;11(11):2276. doi: 10.3390/ma11112276.
Hydrogen can be induced in various ways into reduced-activation ferritic/martensitic (RAFM) steels when they are used as structural materials for advanced nuclear systems. However, because of the fast diffusion of hydrogen in metals, the effect of hydrogen on the evolution of irradiation-induced defects was almost neglected. In the present work, the effect of hydrogen on the evolution of dislocation loops was investigated using a transmission electron microscope. Specimens of reduced-activation ferritic/martensitic (RAFM) steels were irradiated with hydrogen ions to 5 × 10 H⁺ • m at 523⁻823 K, and to 1 × 10 H⁺ • m - 5 × 10 H⁺ • m at 723 K. The experimental results reveal that there is an optimum temperature for dislocation loop growth, which is ~723 K, and it is greater than the reported values for neutron irradiations. Surprisingly, the sizes of the loops produced by hydrogen ions, namely, 93 nm and 286 nm for the mean and maximum value, respectively, at the peak dose of 0.16 dpa under 723 K, are much larger than that produced by neutrons and heavy ions at the same damage level and temperature. The results indicate that hydrogen could enhance the growth of loops. Moreover, 47.3% 1 2 a₀ <111> and 52.7% a₀ <100> loops were observed at 523 K, but 1 2 a₀ <111> loops disappeared and only a₀ <100> loops existed above 623 K. Compared with the neutron and ion irradiations, the presence of hydrogen promoted the formation of a₀ <100> loops.
当将低活化铁素体/马氏体（RAFM）钢用作先进核系统的结构材料时，氢可以通过各种方式引入其中。然而，由于氢在金属中的快速扩散，氢对辐照诱导缺陷演化的影响几乎被忽略。在本工作中，使用透射电子显微镜研究了氢对位错环演化的影响。将低活化铁素体/马氏体（RAFM）钢试样在523 - 823 K下用氢离子辐照至5×10 H⁺•m ，在723 K下辐照至1×10 H⁺•m - 5×10 H⁺•m 。实验结果表明，位错环生长存在一个最佳温度，约为723 K，且该温度高于报道的中子辐照温度值。令人惊讶的是，在723 K下峰值剂量为0.16 dpa时，氢离子产生的环的尺寸，即平均值为93 nm，最大值为286 nm，远大于相同损伤水平和温度下中子和重离子产生的环的尺寸。结果表明氢可以促进环的生长。此外，在523 K时观察到47.3%的1/2 a₀ <111>环和52.7%的a₀ <100>环，但在623 K以上，1/2 a₀ <111>环消失，仅存在a₀ <100>环。与中子和离子辐照相比，氢的存在促进了a₀ <100>环的形成。
