摘要
采用400 keV的Fe+离子在400℃下对一种新型核级Fe13Cr4Al合金进行了辐照,利用透射电镜(TEM)和纳米显微硬度仪分析及测试了其辐照前后的微观结构和硬度值。结果表明:Fe+离子辐照在合金基体中形成了大量位错环而未形成明显尺寸的空位团。随辐照剂量的增加,位错环尺寸不断增大,位错环体密度先增加,后趋于饱和,数值稳定在3.1×1022 /m3。辐照未使合金基体非晶化,但导致Laves析出相发生非晶化转变。随辐照剂量的增加,析出相中Nb、Mo、Ta和Cr 4种元素的含量呈减少趋势,而Si的含量却逐渐增加。在60~100 nm深度范围发生明显辐照硬化现象,临界深度值hc=100 nm。辐照硬化值与辐照剂量呈幂函数关系:ΔHIrr=0.4288(d)0.2311;而与微观组织参量(ND)0.5呈正相关:ΔHIrr=55.36(ND)0.5。
A new type of nuclear grade Fe13 Cr4 Al alloy was irradiated by 400 keV Fe+ions at 400℃.Microstructure and microhardness of the alloy before and after irradiation were analyzed by transmission electron microscopy and nanoindentor,respectively.The results show that a large number of dislocation loops are formed in the alloy matrix after irradiation by 400 keV Fe+ions,and the vacancy cluster with clear size is not formed.With the increase of the irradiation dose,the size of the dislocation loop increases,while their density increases first and finally tends to a saturated value of 3.1×1022/m3.The Fe+ions irradiation does not amorphize the alloy matrix,but results in an amorphization transition of the Laves phase.The content of Nb,Mo,Ta and Cr in the precipitated phase decrease with the increase of the irradiation dose,while the content of Si gradually increases.There is the obvious irradiation hardening in the depth range of 60-100 nm,and the critical depth value(hc)is 100 nm.The irradiation-hardening value is in a power-function relationship with the irradiation dose:ΔHIrr=0.4288(d)0.2311,and shows positive correlation with the microstructure parameter:ΔHIrr=55.36(ND)0.5.
作者
吴伟松
张瑞谦
冉广
王辉
雷鹏辉
孙永铎
王清
黄金池
周哲辉
朱勇辉
WU Wei-song;ZHANG Rui-qian;RAN Guang;WANG Hui;LEI Peng-hui;SUN Yong-duo;WANG Qing;HUANG Jin-chi;ZHOU Zhe-hui;ZHU Yong-hui(College of Energy,Xiamen University,Xiamen 361102,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610041,China;Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第6期88-96,共9页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(U1867201,U1832112)
厦门大学能源学院发展基金(2018NYFZ01)
