Effects of alloying on the microstructures and mechanical property of Nb-Mo-Si based in situ composites |
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| Affiliation: | 1. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. AVIC Manufacturing Technology Institute, Beijing 100024, China;1. Second Department of Neurosurgery, The First Affiliated Hospital of Kunming Medical University, Kunming, China;2. Department of Anatomy, Histology and Embryology, Kunming Medical University, Kunming, China;1. Materials Science and Engineering, Arizona State University, Tempe, AZ 85287-6106, United States;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, PR China;3. International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, PR China;4. AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, PR China;5. Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India |
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| Abstract: | Nb-Mo-Si based alloys have been prepared by arc melting in a water-cooled copper crucible under an argon atmosphere. The effects of Al, Cr, Hf and Ti additions on the phase components and stability, microstructures and mechanical property of Nb-Mo-Si based alloys have been studied. The results indicated that the additions of Al, Cr and Ti elements do not change the phase components of Nb-20Si-6Mo alloys, which are composed of Nb solid solution (Nbss) and β-Nb5Si3. The phase component is α-Nb5Si3 and Nbss in Nb-20Si-6Mo-3Hf alloy. The additions of Cr and Ti element make the Nbss/Nb5Si3 eutectic morphology anomalous and coarsening. The element segregation is obvious found with the additions of Hf and Ti. The enrichments of Hf and Ti change the compositions of retained melt and promote the formation of fine eutectic structure. After heating treatment at 1873K for 10 h, β-Nb5Si3 phase translates into α-Nb5Si3 phase and γ-Nb5Si3 phase. The eutectic structures tend to anomalous and coarsening. The Ti solid solution (Tiss) phase was found in Nb-20Si-6Mo-20Ti alloy and the formation mechanism of Tiss phase was discussed. The high temperature (1523 K) compression strength of as cast Nb-Mo-Si based alloys increased with the additions of Al, Cr, Hf, and decreased with Ti addition. |
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| Keywords: | Nb-Mo-Si alloys Alloying Heat treatment Microstructure High temperature compression strength |
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