Considerable knock-on displacement of metal atoms under a low energy electron beam

IMR OpenIR

	Considerable knock-on displacement of metal atoms under a low energy electron beam
	Gu, Hengfei; Li, Geping; Liu, Chengze; Yuan, Fusen; Han, Fuzhou; Zhang, Lifeng; Wu, Songquan; Li, GP (reprint author), Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.; Li, GP (reprint author), Univ Sci & Technol China, 96 Jinzhai Rd, Hefei 230026, Peoples R China.
	2017-03-15
发表期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
卷号	7 页码:-
摘要	Under electron beam irradiation, knock-on atomic displacement is commonly thought to occur only when the incident electron energy is above the incident-energy threshold of the material in question. However, we report that when exposed to intense electrons at room temperature at a low incident energy of 30 keV, which is far below the theoretically predicted incident-energy threshold of zirconium, Zircaloy-4 (Zr-1.50Sn-0.25Fe-0.15Cr (wt.%)) surfaces can undergo considerable displacement damage. We demonstrate that electron beam irradiation of the bulk Zircaloy-4 surface resulted in a striking radiation effect that nanoscale precipitates within the surface layer gradually emerged and became clearly visible with increasing the irradiation time. Our transmission electron microscope (TEM) observations further reveal that electron beam irradiation of the thin-film Zircaly-4 surface caused the sputtering of surface alpha-Zr atoms, the nanoscale atomic restructuring in the alpha-Zr matrix, and the amorphization of precipitates. These results are the first direct evidences suggesting that displacement of metal atoms can be induced by a low incident electron energy below threshold. The presented way to irradiate may be extended to other materials aiming at producing appealing properties for applications in fields of nanotechnology, surface technology, and others.; Under electron beam irradiation, knock-on atomic displacement is commonly thought to occur only when the incident electron energy is above the incident-energy threshold of the material in question. However, we report that when exposed to intense electrons at room temperature at a low incident energy of 30 keV, which is far below the theoretically predicted incident-energy threshold of zirconium, Zircaloy-4 (Zr-1.50Sn-0.25Fe-0.15Cr (wt.%)) surfaces can undergo considerable displacement damage. We demonstrate that electron beam irradiation of the bulk Zircaloy-4 surface resulted in a striking radiation effect that nanoscale precipitates within the surface layer gradually emerged and became clearly visible with increasing the irradiation time. Our transmission electron microscope (TEM) observations further reveal that electron beam irradiation of the thin-film Zircaly-4 surface caused the sputtering of surface alpha-Zr atoms, the nanoscale atomic restructuring in the alpha-Zr matrix, and the amorphization of precipitates. These results are the first direct evidences suggesting that displacement of metal atoms can be induced by a low incident electron energy below threshold. The presented way to irradiate may be extended to other materials aiming at producing appealing properties for applications in fields of nanotechnology, surface technology, and others.
部门归属	[gu, hengfei ; li, geping ; liu, chengze ; yuan, fusen ; han, fuzhou ; zhang, lifeng] chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china ; [gu, hengfei ; zhang, lifeng] univ chinese acad sci, 19 yuquan rd, beijing 100049, peoples r china ; [li, geping ; liu, chengze ; yuan, fusen ; han, fuzhou] univ sci & technol china, 96 jinzhai rd, hefei 230026, peoples r china ; [wu, songquan] chinese acad sci, fujian inst res struct matter, key lab optoelect mat chem & phys, 155 yangqiao rd west, fuzhou 350002, peoples r china
学科领域	Multidisciplinary Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000396869500004
引用统计	被引频次：39[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78231
专题	中国科学院金属研究所
通讯作者	Li, GP (reprint author), Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.; Li, GP (reprint author), Univ Sci & Technol China, 96 Jinzhai Rd, Hefei 230026, Peoples R China.
推荐引用方式 GB/T 7714	Gu, Hengfei,Li, Geping,Liu, Chengze,et al. Considerable knock-on displacement of metal atoms under a low energy electron beam[J]. SCIENTIFIC REPORTS,2017,7:-.
APA	Gu, Hengfei.,Li, Geping.,Liu, Chengze.,Yuan, Fusen.,Han, Fuzhou.,...&Li, GP .(2017).Considerable knock-on displacement of metal atoms under a low energy electron beam.SCIENTIFIC REPORTS,7,-.
MLA	Gu, Hengfei,et al."Considerable knock-on displacement of metal atoms under a low energy electron beam".SCIENTIFIC REPORTS 7(2017):-.