Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten
Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten
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DOI：
10.1080/21663831.2017.1292326
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发表时间：
2017-01-01
影响因子：
8.3
通讯作者：
Maloy, S. A.
中科院分区：
文献类型：
--
作者：
El-Atwani, O.;Hinks, J. A.;Maloy, S. A.
纳米晶金属由于其较大的晶界面积而被认为是高抗辐射材料。在高温氦辐照下，纳米晶和超细钨的耐辐照性增强存在一个晶粒尺寸阈值。通过透射电子显微镜测量了平均气泡密度、投影气泡面积和相应的体积变化，并绘制了两种离子影响下晶粒尺寸的函数图。小于35 nm尺寸的纳米晶晶粒的体积变化比超细晶粒小10-20倍，这是根据晶界缺陷吸收效率来讨论的[图]。在高温氦辐照下，纳米晶和超细钨存在晶粒尺寸阈值，以增强抗辐照性能。
Nanocrystalline metals are considered highly radiation-resistant materials due to their large grain boundary areas. Here, the existence of a grain size threshold for enhanced irradiation resistance in high-temperature helium-irradiated nanocrystalline and ultrafine tungsten is demonstrated. Average bubble density, projected bubble area and the corresponding change in volume were measured via transmission electron microscopy and plotted as a function of grain size for two ion fluences. Nanocrystalline grains of less than 35 nm size possess similar to 10-20 times lower change in volume than ultrafine grains and this is discussed in terms of the grain boundaries defect sink efficiency.[GRAPHICS].IMPACT STATEMENTA grain size threshold in nanocrystalline and ultrafine tungsten has been shown to exist for enhanced irradiation-resistance performance during high-temperature helium irradiation.