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,2021,50(8):2760~2764.[Gong Ziqi,Wu Jin,Sun Wei,Chen Ziyong,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.]
BY对高铌TiAl合金组织和拉伸性能的影响
投稿时间:2020-06-19  修订日期:2020-08-22
中文关键词:  TiAl  微观偏析  拉伸  组织
基金项目:the National Natural Science Foundation of China (No. 51301005) and the Tianjin Education Commission Scientific Research Project (No. 2019KJ139)
中文摘要:
      研究了B和Y对Ti45Al8Nb0.2W0.25Cr (at%) 合金的微观结构、微观偏析和拉伸行为的影响。结果表明,高铌TiAl合金中的β相稳定元素促进了微观偏析区域中γ相以及大块状微观偏析区域的形成。具有低比表面积的大块状微偏析区域降低了微偏析界面处的空洞和裂纹的成核率,明显降低了晶界处的强度和合金的抗拉强度。B和Y的添加明显的细化了片层团,增加了片层团处空洞成核的机会,从而提高了变形抗力。分析了2种合金的拉伸机理。
Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys
英文关键词:TiAl  microsegregation  tension  microstructure
英文摘要:
      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.
作者单位E-mail
宫子琪 天津中德应用技术大学 机械工程学院天津 300350 ziqigong@163.com 
武晋 天津中德应用技术大学 机械工程学院天津 300350  
孙伟 天津中德应用技术大学 机械工程学院天津 300350  
陈子勇 北京工业大学 材料科学与工程学院北京 100124  
聂祚仁 北京工业大学 材料科学与工程学院北京 100124  
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