Characterisation of helium ion irradiated bulk tungsten: A comparison with the in-situ TEM technique
Characterisation of helium ion irradiated bulk tungsten: A comparison with the in-situ TEM technique
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DOI：
10.1016/j.fusengdes.2018.11.024
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发表时间：
2019-01
影响因子：
1.7
通讯作者：
Robert Harrison;N. Peng;Roger P. Webb;J. Hinks;Stephen E. Donnelly
中科院分区：
文献类型：
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作者：
Robert Harrison;N. Peng;Roger P. Webb;J. Hinks;Stephen E. Donnelly
非原位He离子辐照体W的透射电子显微镜（TEM）已进行定量比较损伤的微观结构，在原位离子辐照与TEM实验过程中观察到的可比厚度的区域。在500 ° C和800 °C的温度下对样品进行辐照以达到2000和500的He-appm/DPA比至1.5和3.0DPA。对于在500 °C下的辐照，气泡直径（~ 102 nm）较大，而气泡面密度（~ 1012 bubbles/cm 2）低于原位实验中的那些。这是由于更大量的他被保留在非原位散装实验，而在原位实验中，一些可能会逃脱，由于接近的表面。在所有样品中均观察到位错环，其特征为b = ±½<111>型，nob=<100>型环。位错环主要为间隙型（约60%），与原位实验结果一致。然而，在这项工作中的位错环较大，尺寸范围从7到100 nm，并观察到大浓度的纠缠位错线相比，在原位实验中的大部分晶粒。
Transmission electron microscopy (TEM) of ex-situ He ion irradiated bulk W has been performed to quantitatively compare the damage microstructure to that observed in regions of comparable thicknesses during in-situ ion irradiation with TEM experiments. Samples were irradiated to achieve He-appm/DPA ratios of 2000 and 500 at temperatures of 500 and 800 °C to 1.5 and 3.0 DPA. For irradiations at 500 °C, bubble diameters (∼2 nm) were larger and areal bubble densities (∼1012bubbles/cm2) were lower than those in the in-situ experiments. This is attributed to greater amounts of He being retained in the ex-situ bulk experiments whereas in the in-situ experiments some may escape due to the proximity of surfaces. Dislocation loops were observed in all samples and were characterised asb= ±½<111> type with nob= <100> type loops. Dislocation loop populations were dominated by interstitial type (∼60%) agreeing with in-situ experiments. However, dislocation loops in this work were larger, ranging in size from 7 to 100 nm and large concentrations of entangled dislocation lines were observed in the bulk of the grain as compared to in the in-situ experiments.