Near-surface investigation of positron diffusion length in helium-implanted Fe9Cr and its ODS variant
Near-surface investigation of positron diffusion length in helium-implanted Fe9Cr and its ODS variant
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DOI：
10.1016/j.apsusc.2020.148004
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发表时间：
2021-02-01
影响因子：
6.7
通讯作者：
Hruska, Petr
中科院分区：
文献类型：
--
作者：
Degmova, Jarmila;Krsjak, Vladimir;Hruska, Petr
本文采用深度敏感慢正电子多普勒展宽技术，对注入He+的f/m钢各近表层的正电子扩散进行了表征。正电子的扩散长度是常用的湮灭参数之一，对大范围位移损伤中的辐射缺陷具有很高的敏感性。该参数表示正电子向表面反向扩散的概率，反映了微观结构损伤。通过VEPFIT程序对注入氦的Fe9Cr和ODS Fe9Cr钢的多普勒展宽光谱数据进行分析，确定了注入后相应层的扩散长度和厚度的变化。
In the present paper, we employ the depth sensitive slow positron Doppler broadening technique to characterise the positron diffusion in various near-surface layers of He+ implanted f/m steels. One of the frequently used positron annihilation parameters, with a high sensitivity to radiation-induced defects in a wide range of displacement damage, is the positron diffusion length. This parameter expresses the probability of the back diffusion of positrons to the surface and reflects the microstructural damage. Via the application of VEPFIT program on Doppler broadening spectroscopy data obtained on helium-implanted Fe9Cr and ODS Fe9Cr steels, we determined the changes in diffusion length and thickness of corresponding layers due to implantation.