Vacancy evolution in Ni during irradiation at high temperatures studied by in situ positron annihilation spectroscopyms in comparison with simulation profiles
Vacancy evolution in Ni during irradiation at high temperatures studied by in situ positron annihilation spectroscopyms in comparison with simulation profiles
复制标题
原位正电子湮没光谱研究高温辐照过程中镍空位演化并与模拟曲线进行比较
DOI：
10.1088/1742-6596/262/1/012060
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T Yoshiie and A Itoh
中科院分区：
文献类型：
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作者：
H Tsuchida;T Iwai;S Kasai;H Tanaka;N Oshima;R Suzuki;T Yoshiie and A Itoh
我们目前的实验结果，在原位研究原子空位的生产和它的演变过程中发生的照射，通过使用慢正电子束。在高温条件下，辐照过程中产生的空位的热稳定性进行了研究。用400 keV He离子在296（RT）、368和713 K三个不同温度下辐照退火的Ni样品。测量了正电子湮没γ射线在开束（辐照过程中）和关束（非辐照）条件下的多普勒展宽，观察了线形参数S的变化。结果表明，S的变化依赖于样品的温度，表明在高温辐照下，由约15个空位组成的空位团主要是通过原子级空位的热演化形成的。我们发现，在辐照过程中发生的激活空位的形成，这导致空位聚集。
We present experimental results for in situ study of atomic-vacancy production and its evolution occurring during irradiation by using a slow-positron beam. Thermal stability of the vacancy produced during irradiation is investigated under elevated temperature conditions. An annealed Ni specimen was irradiated with 400 keV He ions at three different temperatures of 296 (RT), 368 and 713 K. Doppler broadenings of positron-annihilation γ-rays were measured and variation of the line-shape parameter S was observed under beam-on (during irradiation) and beam-off (non-irradiation) conditions. Results indicate that variation of the S depends on the specimen temperature, showing that vacancy cluster consisting of about 15 vacancies is formed predominantly via thermal evolution of atomic-sized vacancies under irradiation at high temperatures. We found that formation of the activated vacancies occurs during irradiation, which leads to vacancy clustering.