Modeling of damage creation in metallic materials under swift heavy ion irradiations

	Modeling of damage creation in metallic materials under swift heavy ion irradiations
	Wang, ZG; Jin, YF; Hou, MD; Jin, GM
	2000-06
关键词	electronic energy loss thermal spike swift heavy ion irradiation damage creation metallic material
卷号	169
页码	98-105
英文摘要	A variety of recent experiments in metallic targets unambiguously prove that a dense electron excitation induces atomic displacements leading to bulk damage. However, till now there is no convincing theoretical model that explains these. In the present work, a model based on the thermal spike mechanism has been proposed to account for the experimental evidence and a microscopic energy transfer mechanism between excited electrons and target atoms. This model follows four stages in the time stale of events: (1) ejection of target electrons and atoms, (2) slowing down of ejected electrons and thermalization of target valence electrons, (3) conversion of energy from thermalized electrons to target atoms, and (4) structural modification of the target. The characteristics of energy transfers are indirect and coherent in space and time. Based on mathematical developments of this model, electronic energy loss-induced thermal spike process and accompanying defect evolution are numerically simulated. In a collective process involving many neighboring target atoms, this thermal spike process is sufficient to result in microstructure modification in the bulk of metallic materials. Therefore, in the framework of this model, experimental results available in metallic materials can be explained. (C) 2000 Elsevier Science B.V. All rights reserved.
会议录	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
会议录出版者	ELSEVIER SCIENCE BV
会议录出版地	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种	英语
WOS研究方向	Instruments & Instrumentation ; Nuclear Science & Technology ; Physics
WOS记录号	WOS:000088184200020
内容类型	会议论文
源URL	[http://119.78.100.186/handle/113462/57926]
专题	中国科学院近代物理研究所
通讯作者	Wang, ZG
作者单位	Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Wang, ZG,Jin, YF,Hou, MD,et al. Modeling of damage creation in metallic materials under swift heavy ion irradiations[C]. 见:.