核反应堆压力容器模拟钢中富Cu原子团簇的析出与嵌入原子势计算  

Precipitation of Cu-rich clusters in reactor pressure vessel model steels and embedded-atom method potentials

作　　者：林民东[1] 朱娟娟[1] 王伟[1] 周邦新[1] 刘文庆[1] 徐刚[1] 

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《物理学报》2010年第2期1163-1168,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2006CB605003);上海市重点学科建设计划(批准号:S30107)资助的课题~~

摘　　要：利用原子探针层析技术(APT)和热处理时效方法,研究了合金元素Ni对核反应堆压力容器模拟钢中富Cu原子团簇析出的影响.实验结果表明,添加合金元素Ni(0.84wt%)的样品中析出富Cu原子团簇的数量密度高于不添加Ni的样品,富Cu原子团簇内以及团簇和基体界面处都有Ni元素的富集现象,这说明合金元素Ni会促使富Cu原子团簇的析出.从多体势的角度出发,利用嵌入原子势理论,基于纯金属元素Fe,Cu,Ni的多体势参数,建立了Fe-Cu二元和Fe-Cu-Ni三元体系的嵌入原子多体势.计算结果表明,当模拟合金中存在1at%Ni时有利于富Cu原子团簇的析出,这与实验结果相符.Atom probe tomography characterization and thermal aging method have been employed to investigate the precipitation of Cu-rich clusters in reactor pressure vessel （RPV） model steels with and without the addition of Ni alloying element. It is observed that the number density of Cu-rich clusters in the PRV model steel with the addition of Ni （0.84 wt%） is higher than that without the addition of Ni. The segregation of nickel in the Cu-rich clusters and at the boundaries of clusters/matrix was also observed. It is found that the nickel alloying element can promote the precipitation of Cu-rich clusters in RPV model steel. An analytical embedded atom method model of Fe-Cu and Fe-Cu-Ni system is constructed on the basis of the physical properties of pure constituents Fe, Cu and Ni. The calculation results show that the nickel （1 at%） can promote the precipitation of Cu-rich clusters. The calculation results agree with the results of experiments.

关 键 词：核反应堆压力容器钢 原子探针层析技术 富Cu原子团簇 嵌入原子势 

分 类 号：TL341[核科学技术—核技术及应用]