室温Xe离子辐照后的镍基合金原位加热研究  

Study on In-situ Heating of Nickel-based Superalloy Irradiated by Xe Ion at Room Temperature

作　　者：侯宇 李德辉[2] 陆燕玲[2] HOU Yu;LI Dehui;LU Yanling(College of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212000 [2]中国科学院上海应用物理研究所,上海201800

出　　处：《热加工工艺》2023年第10期20-24,共5页Hot Working Technology

基　　金：国家自然科学基金面上基金项目(52071330)。

摘　　要：熔盐堆作为第四代反应堆具有广阔的前景。UNSN10003合金被认为是熔盐堆最具前景的候选材料,由于长期在辐照环境下服役,因此需要对其辐照后的微观结构变化进行研究。利用透射电镜原位加热技术研究了UNS N10003镍基合金经室温Xe离子辐照后特征组织随温度的演变规律。结果表明:当辐照剂量低于0.5 dpa时,合金中呈现出大量黑斑,随着辐照剂量的增加,合金中黑斑数量逐渐减少,明暗相间结构特征逐渐明显。选取典型辐照特征(辐照剂量分别为0.5dpa和10 dpa)进行原位电镜观察,发现随实验温度的升高,黑斑数量下降,位错环增加;明暗相间结构逐渐被破坏。黑斑是辐照过程中形成的点缺陷,这些点缺陷在高温下会消失或形成位错环;明暗相间结构应为辐照形成的缺陷聚集。The molten salt reactor has broad prospects as a fourth-generation reactor.UNS N10003 alloy was considered to be the most promising candidate material for molten salt reactors.It would be used for a long time under irradiation,so it is necessary to study the microstructure changes after irradiation.By transmission electron microscopy in-situ heating technology,the evolution of the characteristic structure of UNS N10003 nickel-based alloy after Xe ion irradiation at room temperature was studied.The results show that when the irradiation dose is lower than 0.5 dpa,a large number of black spots appear in the alloy.With the increase of the irradiation dose,the number of black spots in the alloy gradually decreases,and the structural characteristics of light and dark structure are gradually obvious.The typical irradiation characteristics(irradiation dose:0.5 dpa and 10 dpa)were selected for in-situ electron microscopy observation,and it was found that with the temperature increasing,the number of black spots decreases,and the dislocation loop increases;the light and dark structure is gradually destroyed.Black spots are point defects,formed during the irradiation process.These point defects disappear or form dislocation loops at high temperatures;the light-dark structure should be the clustering of defects formed by the irradiation.

关 键 词：镍基合金 室温辐照 原位加热 微观结构 

分 类 号：TG146.15[一般工业技术—材料科学与工程]