Effect of trace Ce and B additions on the microstructure of Nb-3Si-22Tialloys |
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| Authors: | Meiling Wu Liwu Jiang Shiyu Qu Fengwei Guo Ming Li Yongwang Kang Yafang Han |
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| Affiliation: | Science & Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095,China,National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China,Science & Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095,China,Science & Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095,China,Science & Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095,China,Science & Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095,China and Science & Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095,China |
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| Abstract: | The effects of trace Ce and B additions on the microstructure Nb-22Ti-3Si alloys were studied. Themicrostructure of the alloys was observed by scanning electron microscope (SEM), and their phasecompositions were analyzed with X-ray diffraction (XRD) and Electro-Probe micro-analyzer (EPMA). Thedistributions of the elements were detected by Spectrum analyzer. The interface of the phases in the alloys wasinvestigated by transmission electron microscopy (TEM). The results indicated that two phases of Nbss andNb3Si presented in Nb-22Ti-3Si, Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B alloys. The segregation of Ti at theinterface between Nbss and Nb3Si was promoted and the volume fraction of silicides in the alloy increased withthe trace B and Ce addition to the Nb-22Ti-3Si alloy respectively. And there was no single and definiteorientation relationship between Nb3Si and Nbss in Nb-22Ti-3Si, Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2Balloys. Compared with the Nb-22Ti-3Si alloy, the Nbss superlattice structure was found in Nb-22Ti-3Si-0.2Ceand Nb-22Ti-3Si-0.2B alloys. |
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| Keywords: | Nb-3Si-22Ti alloyNb3SiCeBMicrostructurePhase interfaceSuperlattice |
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