Effects of Al Addition on the Microstructure and Properties of Nb/Nb5Si3 in situ Composites Fabricated via Spark Plasma Sintering
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2014年第5期
论文作者：龙文元 YAO Junping FU Zhengyi
文章页码：1036 - 1038
摘 要：Dense Nb/Nb5Si3 composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructures of the synthesised composites were analyzed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb5Si3 phase. The microstructure of the Nb/Nb5Si3 in situ composites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3 phase. In addition, the Rockwell hardness of the composites decreased with the increase in Al additions. The Rockwell hardness of Nb-20 Siis 60 HRC, which decreased to approximately 52.7 HRC when the Al content increased to 15 at%. The oxidation resistance of the Nb/Nb5Si3 in situ composites significantly improved with the increase in Al addition.
龙文元1，YAO Junping1，FU Zhengyi2
1. College of Aeronautical Manufacuring Engineering, Nanchang Hangkong University2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
摘 要：Dense Nb/Nb5Si3 composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructures of the synthesised composites were analyzed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb5Si3 phase. The microstructure of the Nb/Nb5Si3 in situ composites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3 phase. In addition, the Rockwell hardness of the composites decreased with the increase in Al additions. The Rockwell hardness of Nb-20 Siis 60 HRC, which decreased to approximately 52.7 HRC when the Al content increased to 15 at%. The oxidation resistance of the Nb/Nb5Si3 in situ composites significantly improved with the increase in Al addition.
关键词：
