Effect of trace Ce and B additions on the microstructure of Nb-3Si-22Ti alloys

作     者：Meiling Wu Liwu Jiang Shiyu Qu Fengwei Guo Ming Li Yongwang Kang Yafang Han 

作者机构：Science & Technology on Advanced High Temperature Structural Materials LaboratoryAECC Beijing Institute of Aeronautical Materials National Center for Materials Service SafetyUniversity of Science and Technology Beijing 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2017年第27卷第6期

页      面：362-368页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51601183) the Aeronautical Science Foundation of China(No.2015ZF21013) 

主　　题：Nb-3Si-22Ti alloy Nb3Si Ce B Microstructure Phase interface Superlattice 

摘      要：The effects of trace Ce and B additions on the microstructure Nb-22Ti-3Si alloys were *** microstructure of the alloys was observed by scanning electron microscope（SEM）,and their phase compositions were analyzed with X-ray diffraction（XRD） and Electro-Probe micro-analyzer（EPMA）.The distributions of the elements were detected by Spectrum *** interface of the phases in the alloys was investigated by transmission electron microscopy（TEM）.The results indicated that two phases of Nbss and Nb;Si presented in Nb-22Ti-3Si,Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B *** segregation of Ti at the interface between Nbss and Nb;Si was promoted and the volume fraction of silicides in the alloy increased with the trace B and Ce addition to the Nb-22Ti-3Si alloy *** there was no single and definite orientation relationship between Nb;Si and Nbss in Nb-22Ti-3Si,Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B *** with the Nb-22Ti-3Si alloy,the Nbss superlattice structure was found in Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B alloys.