Verification of the theory of primary radiation damage by comparison with experimental data
Verification of the theory of primary radiation damage by comparison with experimental data
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DOI：
10.1016/j.jnucmat.2019.07.019
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发表时间：
2019-11-01
影响因子：
3.1
通讯作者：
Zach, V
中科院分区：
文献类型：
--
作者：
Ogorodnikova, O., V;Majerle, M.;Zach, V
了解固体中的辐射损伤对于发展先进材料技术，即空间应用、电子显微镜、半导体加工、裂变和核聚变具有重要意义。空间材料必须经得起高能质子的照射。未来热核反应堆的建造材料必须经得起高能中子的照射。材料的许多性质，包括力学性质，都是由晶格缺陷的存在和行为决定的。因此，辐射缺陷的研究是辐射物理和固体物理两个领域相结合的重要课题。本文对先进裂变与核聚变反应堆的主要材料体心立方钨(W)和体心立方铁(Fe)的初级缺陷形成提出了新的认识。本工作的目的是利用正电子湮没寿命谱(PALS)方法，结合文献资料和两种辐射损伤模型，即经典的Norgett-Robinson-Torrens模型(NRT-dpa)和新近发展的非热复合修正模型(Arcdpa)，比较W和Fe中子源和质子源缺陷的新实验数据。结果表明，ARC-DPA模型比NRT-DPA模型能更好地描述中子和质子辐照Fe的实验数据。而中子和质子辐照的W的实验数据介于NRT-DPA和ARC-DPA预测之间。这些结果对材料中初级辐射缺陷的形成有了新的认识，并表明固体中的辐射损伤理论需要进一步发展。(C)2019爱思唯尔B.V.保留所有权利。
Understanding of radiation damage in a solid is important for development of advanced material technologies, namely, for space application, electron microscopy, semiconductor processing, fission and nuclear fusion. Space materials must withstand exposure to high-energy protons. Construction materials of future thermonuclear reactors must withstand exposure to high-energy neutrons. Many properties of materials including mechanical properties are governed by the presence and behavior of lattice defects. Hence, the study of the radiation-induced defects is an important task combining two fields: radiation physics and solid state physics. The paper presents new knowledge on primary defect formation in the main materials for advanced fission and nuclear fusion reactors, bcc tungsten (W) and bcc iron (Fe). The objective of this work is to compare the new experimental data of neutron- and proton-induced defects in W and Fe using well-established method of positron-annihilation lifetime-spectroscopy (PALS) in combination with the literature data with two models of radiation damage, the classical Norgett-Robinson-Torrens (NRT-dpa) model and recently developed athermal recombination corrected (arcdpa) model. It is shown that experimental data for neutron- and proton-irradiated Fe are better described by arc-dpa model than NRT-dpa model. Whereas experimental data for neutron- and proton-irradiated W are between the NRT-dpa and arc-dpa predictions. The obtained results shed new light on the formation of the primary radiation defects in materials and indicate the need for further development of the theory of radiation damage in a solid. (C) 2019 Elsevier B.V. All rights reserved.