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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Effects of temperature on helium bubble behaviour in Fe-9Cr alloy
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Effects of temperature on helium bubble behaviour in Fe-9Cr alloy

机译：温度对Fe-9CR合金氦泡行为的影响

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摘要

In the present study, Fe-9Cr model alloys were irradiated by 275 keV He+ ions at 500 to 800 degrees C to a peak damage level and implanted helium content of 0.5 dpa and 0.75 at% He, respectively. Effects of temperature on He bubble behaviour were studied by transmission electron microscopy (TEM) to reveal the temperature effects. The bubble spatial distribution changes from homogenous at 500 and 600 degrees C to heterogeneous at 700 and 800 degrees C, due to preferential bubble precipitation on dislocations and grain boundaries at high temperature. Faceted bubbles with low energy faces along the {001} planes were present at all four temperatures and are attributed to surface energy minimization. Bubble precipitation on the GBs became more pronounced with increasing temperature. Meanwhile, the cavity swelling increased with increasing temperature, from 0.59% at 500 degrees C to 8.21% at 800 degrees C with a sharp increase above 700 degrees C. By analysing the temperature dependence of bubble size and density, a transition temperature between low and high temperature regimes was obtained in terms of different activation energies which are related to different bubble nucleation and formation mechanisms. (C) 2020 Elsevier B.V. All rights reserved.
机译：在本研究中，将Fe-9CR Model合金在500至800℃下以500至800℃的275keV He +离子照射至峰值损伤水平，分别植入0.5dPa的氦含量和0.75at％。通过透射电子显微镜（TEM）研究了温度对他泡行为的影响，揭示温度效应。由于优先气泡沉淀在高温下的脱位和晶界上，气泡空间分布在700和800℃下以700和800℃的均匀变化。在所有四个温度下存在沿{001}平面的低能量面的刻面气泡，并归因于表面能量最小化。 GBS上的泡沫沉淀变得更加明显，随着温度的增加。同时，腔肿胀随温度的增加而增加，在800℃下以500摄氏度的0.59％至8.21％，急剧增加700℃。通过分析气泡尺寸和密度的温度依赖性，低温和较低的过渡温度就不同的激活能而获得高温制度，该激活能量与不同的气泡成核和形成机制有关。 （c）2020 Elsevier B.v.保留所有权利。

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