氦离子辐照对钨纳米丝稳定性的影响  

Effect of Helium Ions Irradiation on Stability of Nano-tungsten Whiskers

作　　者：胡瑞航 杨贞 雷齐俊 李昕洋 董子宇 张晓彤 范红玉 牛金海 HU Ruihang;YANG Zhen;LEI Qijun;LI Xinyang;DONG Ziyu;ZHANG Xiaotong;FAN Hongyu;NIU Jinhai(Liaoning Key Laboratory of Plasma Technology,Dalian Minzu University,Dalian 116600,China)

机构地区：[1]大连民族大学、辽宁省等离子体技术重点实验室,大连116600

出　　处：《材料研究学报》2022年第11期850-854,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金(11405023);辽宁省自然科学基金(20180510006);辽宁省大学生创新创业训练项目(202112026040);大连民族大学“太阳鸟”学生科研项目(tyn2021150)。

摘　　要：用150 eV高能氦(He)离子在400 K对多晶钨(W)表面的W纳米丝进行间歇式辐照并使用扫描电子显微镜、透射电子显微镜以及称重法等手段对其表征,研究了He离子辐照对W纳米丝演变过程的影响。结果表明,高能He离子辐照使W纳米丝极不稳定。随着辐照剂量的增加W纳米丝之间的交联程度逐渐降低。W丝内的He泡在高能He离子溅射的作用下破裂,使W丝塌陷合并,部分溅射出来的W原子沉积在近邻的W纳米丝外壁或W丝根部,最终使W纳米丝演变成顶部细根部粗的锥型结构。Nanoscale tungsten whiskers grown on the surface of polycrystalline W-plate was subjected intermittently to irradiation of He ions with energy of 150 eV at 400 K.The effect of He ion irradiation on the evolution of nanoscale W-whiskers were investigated by means of scanning electron microscope,transmission electron microscope and mass loss method.The results show that nanoscale W-whiskers were extremely unstable in the course of high-energy He ion irradiation,and the degree of crosslinking between W-whiskers decreases gradually with the increase of irradiation fluence.Due to high-energy He ion sputtering,He bubbles existed in the whiskers will break and lead to collapse and coalesce of the Wwhiskers.Meanwhile,certain amount of the yielded W atoms by He ion sputtering may re-deposited on the outer wall or the root of the nanoscale whiskers nearby,and finally,the relevant nanoscale whiskers may evolve into a cone-shaped structure with a thin top and a thick root.

关 键 词：金属学 钨 氦离子辐照 溅射 

分 类 号：TG14[一般工业技术—材料科学与工程]