Vacancy-type defect production in iron under ion beam irradiation investigated with positron beam Doppler broadening technique
Vacancy-type defect production in iron under ion beam irradiation investigated with positron beam Doppler broadening technique
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DOI：
10.1016/j.jnucmat.2004.04.064
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发表时间：
2004-08
影响因子：
3.1
通讯作者：
T. Iwai;Y. Ito;M. Koshimizu
中科院分区：
文献类型：
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作者：
T. Iwai;Y. Ito;M. Koshimizu
用正电子束多普勒展宽技术研究了室温下不同离子辐照产生的铁中空位型缺陷的积累。利用不同离子种类（He， C， O, Fe）研究了PKA能量对空位型缺陷产生的影响。空位型缺陷的积累导致了多普勒展宽谱的锐化，即S参数的增大。在固定的正电子能量为15kev的条件下，测量了S参数作为离子影响的函数。辐照初期S参数随辐照通量的增大而增大，辐照后S参数达到某一饱和值，该饱和值随离子种类的变化而变化。离子辐照强度越大，饱和S参数值越高。与相同低dpa水平下S参数的增量变化相比，更重的离子也导致了更大的变化。
Accumulation of vacancy-type defects in iron produced by various ion irradiations at room temperature was investigated with positron beam Doppler broadening technique. Various ion species (He, C, O, Fe) were used for investigation of the effect of PKA energy on vacancy-type defect production. Accumulation of vacancy-type defects leads to sharpening of Doppler broadening spectra, i.e., increase of S parameter. S parameter was measured as a function of ion fluence for various ion species at a fixed positron energy of 15 keV. At the early stage of irradiation, S parameter increases with increasing fluence, and then it reaches some saturated S parameter value that varies with ion species. The saturated S parameter values tend to be higher for heavier ion irradiation. When compared with the incremental change of S parameter at the same low dpa level, heavier ions also lead to a greater change.