球磨时间和退火温度对氧化物弥散强化合金粉末结构的影响  

Effect of Ball Milling Time and Annealing Temperature on the Structure of ODS Alloy Powders

作　　者：朱高凡 杨新异 曹海波 黄群英[1,2] ZHU Gaofan;YANG Xinyi;CAO Haibo;HUANG Qunying(Institute of Nuclear Energy Safety Technology,Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,核能安全技术研究所,合肥230031 [2]中国科学技术大学研究生院科学岛分院,合肥230026

出　　处：《材料导报》2023年第17期238-243,共6页Materials Reports

基　　金：中国科学院国际合作局国际伙伴计划(116134KYSB20200056)。

摘　　要：为了研究铁基氧化物弥散强化(ODS)合金粉末中氧化物的结构演变过程与规律,采用行星式球磨机制备了高Y_(2)O_(3)含量的粉末,并在400~1200℃范围内退火1 h,利用XRD、SEM和TEM研究了球磨和退火后粉末的结构变化。结果表明,球磨前期粉末尺寸较大,内部缺陷较多,球磨至48 h时,粉末粒径主要分布在5μm以下,Fe晶粒细化至约20 nm,Y_(2)O_(3)与基体均匀分布,且在球磨过程中出现了少量的Y_(2)Ti_(2)O_(7)相。针对不同退火温度的研究结果显示,退火温度在600℃时开始析出YTiO3相,在1000℃时开始析出Y_(2)Ti_(2)O_(7)相,随着退火温度升高,氧化物逐渐扩散至粉末表层,退火温度超过1000℃时粉末内部Y-Ti-O相比例减少较为明显。ODS粉末的微观结构分析及相关结论可为制备高性能核反应堆结构材料提供一定的借鉴与参考。To study the structural evolution of minor oxide in ODS steel,a high Y_(2)O_(3) content powder was prepared by planetary ball milling and annealed at 400—1200℃for 1 h.The microstructure of the powders was observed with XRD,SEM and TEM.The results show that in the early stage of ball milling,the powder size was larger and the internal defects were more.When ball milling to 48 h,the powder size was less than 5μm,the Fe grain size was refined to about 20 nm,Y_(2)O_(3) was uniform distribution with the matrix and theY_(2)Ti_(2)O_(7) phase appeared during the ball milling process.During annealing,YTiO 3 andY_(2)Ti_(2)O_(7) phases precipitated at 600℃and 1000℃,respectively.With the increase of annealing temperature,the oxides gradually diffuse to the surface layer of the powders.When the annealing temperature exceeded 1000℃,the number of Y-Ti-O phases in the powders reduced obviously.The microstructure analysis and conclusions on ODS powders can give some guidance to fabricate high performance structural materials for nuclear reactor.

关 键 词：氧化物弥散强化 球磨时间 氧化物 退火温度 

分 类 号：TF122[冶金工程—粉末冶金]