The role of grain size in He bubble formation: Implications for swelling resistance
The role of grain size in He bubble formation: Implications for swelling resistance
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DOI：
10.1016/j.jnucmat.2016.12.003
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发表时间：
2017-02-01
影响因子：
3.1
通讯作者：
Taheri, M. L.
中科院分区：
文献类型：
--
作者：
El-Atwani, O.;Nathaniel, J. E., II;Taheri, M. L.
纳米晶金属由于其高缺陷和粒子（如氦）密度而被认为是抗辐射材料。在700 K的He照射下，用透射电子显微镜（TEM）原位研究了纳米晶铁膜的性能。采用自动晶体取向图结合原位透射电镜，探讨了晶粒取向和晶界特征对气泡密度趋势的影响。气泡密度是三种关键晶粒尺寸的函数。气泡密度总体呈增加趋势，直至达到饱和值，而在3000 ~ 7500 nm(2)范围内的颗粒呈分散分布。基于气泡尺寸和面密度的外推膨胀阻力表明，粒径小于2000 nm(2)的晶粒具有最大的表观阻力。此外，剥蚀带与晶粒尺寸、晶粒取向和晶界错取向角无关。Elsevier B.V.出版
Nanocrystalline metals are postulated as radiation resistant materials due to their high defect and particle (e.g. Helium) sink density. Here, the performance of nanocrystalline iron films is investigated in-situ in a transmission electron microscope (TEM) using He irradiation at 700 K. Automated crystal orientation mapping is used in concert with in-situ TEM to explore the role of grain orientation and grain boundary character on bubble density trends. Bubble density as a function of three key grain size regimes is demonstrated. While the overall trend revealed an increase in bubble density up to a saturation value, grains with areas ranging from 3000 to 7500 nm(2) show a scattered distribution. An extrapolated swelling resistance based on bubble size and areal density indicated that grains with sizes less than 2000 nm(2) possess the greatest apparent resistance. Moreover, denuded zones are found to be independent of grain size, grain orientation, and grain boundary misorientation angle. Published by Elsevier B.V.