NbZrTiTa高熵合金的高温氧化行为  

High-temperature Oxidation Behavior of NbZrTiTa High-entropy Alloy

作　　者：王睿鑫 唐宇[1] 李永彦 艾园林 李顺[1] 朱利安[1] 叶益聪[1] 白书欣[1] Wang Ruixin;Tang Yu;Li Yongyan;Ai Yuanlin;Li Shun;Zhu Li’an;Ye Yicong;Bai Shuxin(National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学,湖南长沙410073

出　　处：《稀有金属材料与工程》2020年第7期2417-2424,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51802345);湖南省自然科学基金(2019JJ40338);国防科技大学科研计划项目(ZK17-03-67)。

摘　　要：采用循环氧化考核法以及借助XRD、SEM等技术对电弧熔炼制备的NbZrTiTa高熵合金的高温氧化行为进行了研究。结果表明:NbZrTiTa高熵合金在1000~1400℃温度范围内的氧化速率常数和氧化激活能分别达到1.1×10^-7~1.0×10^-6 g^2·cm^-4·s^-1和97 kJ/mol。NbZrTiTa高熵合金的氧化反应类型为内氧化。高温氧化过程中,氧元素沿具有强晶格畸变和大量位错的富TiZr区扩散,并与金属组元发生反应依次生成不饱和氧化物和饱和氧化物。在组元的高活性以及严重的晶格畸变的共同作用下,NbZrTiTa高熵合金具有极高的氧化活性,展现出了较强的作为结构释能材料的应用潜力。The high-temperature oxidation behavior of NbZrTiTa high-entropy alloy(HEA)was characterized by cyclic oxidation test,XRD and SEM.The results reveal that the oxidation kinetics curve of NbZrTiTa HEA in the temperature range of 1000~1400℃satisfies the parabolic law.The oxidation rate constant and oxidation activation energy achieve1.1×10^-7~1.0×10^-6 g^2·cm^-4·s^-1and 97 kJ/mol,respectively.The oxidation type is internal oxidation.During high-temperature oxidation,oxygen diffuses along the TiZr-rich region with the severe lattice distortion and a large number of dislocations,and then reacts with the metal components to form unsaturated oxides and saturated oxides sequentially.Because of the high activity of constituent elements and the severe lattice distortion,NbZrTiTa HEA displays an extremely high oxidation activity,thus exhibiting strong potential as structure energetic material.

关 键 词：高熵合金 组织结构 高温氧化 氧化行为 NbZrTiTa 

分 类 号：TG172.8[金属学及工艺—金属表面处理]