Y对Nb基体表面包埋渗铝涂层微观组织和生长机制的影响  

Effects of Y on Microstructure and Growth Mechanism of Pack Aluminizing Coatings on Nb Substrate

作　　者：郑力玮 刘恩泽[1] 郑志[1] 宁礼奎[1] 佟健[1] 谭政[1] 李海英 Zheng Liwei;Liu Enze;Zheng Zhi;Ning Likui;Tong Jian;Tan Zheng;Li Haiying(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2023年第12期4117-4124,共8页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2021YFC2202402);辽宁省自然科学基金(2019-MS-329)。

摘　　要：通过向包埋渗铝剂中添加Y2O_(3)粉末在纯Nb基体表面制备了Y改性的渗铝涂层,研究了Y对涂层微观组织和生长机制的影响。结果表明,Y对涂层的相组成和NbAl_(3)相的晶粒形态均无明显影响。随包埋剂中Y2O_(3)添加量的增加,涂层表面的Y含量升高。Y改性后,涂层的生长机制由受Al原子的沿晶扩散控制转变为受Al原子的晶内扩散控制,降低了涂层的生长速率,并使NbAl_(3)相的柱状晶区形成了<010>//ND和<110>//ND的2种丝织构。Y modified aluminizing coatings were prepared on pure Nb substrates by aluminizing in the pack mixtures with Y2O_(3) addition.The effects of Y on the microstructure and growth mechanism of the coatings were studied.The results show that the Y has no obvious effect on the phase constitution of the coating and the grain morphology of NbAl_(3) phase.With the increase in Y2O_(3) content in the pack mixtures,the Y content on the coating surface increases.After Y modification,the growth mechanism of the coatings is changed from being controlled by the intergranular diffusion of Al atoms to being controlled by the intragranular diffusion of Al atoms;it reduces the growth rate of the coatings and contributes to the formation of two kinds of silk textures(<010>//ND and<110>//ND)in the columnar crystal area of NbAl_(3) phase.

关 键 词：NB 包埋渗 铝化物涂层 活性元素效应 

分 类 号：TG174.445[金属学及工艺—金属表面处理]