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宫子琪,武晋,孙伟,陈子勇,聂祚仁.BY对高铌TiAl合金组织和拉伸性能的影响[J].稀有金属材料与工程(英文),2021,50(8):2760~2764.[Gong Ziqi,Wu Jin,Sun Wei,Chen Ziyong and Nie Zuoren.Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys[J].Rare Metal Materials and Engineering,2021,50(8):2760~2764.]
Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys
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Received:June 19, 2020  
DOI:
Key words: TiAl  microsegregation  tension  microstructure
Foundation item:the National Natural Science Foundation of China (No. 51301005) and the Tianjin Education Commission Scientific Research Project (No. 2019KJ139)
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Gong Ziqi,Wu Jin,Sun Wei,Chen Ziyong and Nie Zuoren  
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Abstract:
      The influence of B and Y on the microstructure, microsegregation, and tensile behaviour of the Ti45Al8Nb0.2W0.25Cr (at%) alloy was investigated. The β-stabilizer elements in the high-Nb TiAl alloy promote the formation of the γ phase in the microsegregation region and lead to the formation of large blocky microsegregation areas. The large blocky microsegregation regions with low specific surface areas reduce the nucleation rate of cavities and cracks at the interfaces of the microsegregation, which are harmful to colony boundary strengthening and decrease tensile resistance. The addition of B and Y affords an obvious refinement in the lamellar colony, renders an increasing opportunity for cavity nucleation at the colony boundary, and thus improves the tensile resistance. The tensile mechanisms of the alloys before and after (B, Y) addition were also compared and analysed.