宋晓国,司晓庆,曹健,王志权,赵洪运,冯吉才.高铌TiAl合金钎焊接头组织和性能研究[J].稀有金属材料与工程,2018,47(1):52~58.[X.G. Song,X.Q. Si,J. Cao,Z.Q. Wang,H.Y. Zhao,J.C. Feng.An investigation on microstructure and joining properties of high Nb-containing TiAl alloy brazed joints[J].Rare Metal Materials and Engineering,2018,47(1):52~58.]
高铌TiAl合金钎焊接头组织和性能研究
投稿时间:2016-11-23  修订日期:2016-11-23
中文关键词:  TiAl金属间化合物  真空钎焊  界面组织  力学性能  断口
基金项目:
中文摘要:
      采用Ti-28Ni(wt.%)共晶钎料在1100℃实现了高铌TiAl合金(Ti-45Al-8.5Nb-(W, B, Y) (at.%), 简称TAN)的真空钎焊连接。钎焊接头的典型界面结构为TAN/τ3-Al3Ti2Ni + B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN。深入研究了保温时间对钎焊接头界面组织和连接性能的影响。结果表明:Ni元素从熔融钎料向TAN母材的扩散决定了界面组织的演化,随着保温时间的延长促进了扩散层的增厚,同时导致钎缝宽度逐渐减小。接头剪切强度测试结果显示当保温时间为15分钟时,获得的最大接头室温剪切强度和高温(600℃)剪切强度分别是248.6MPa和166.4MPa。接头断口分析表明在剪切实验中裂纹主要沿着连续的金属间化合物层产生和扩展。
An investigation on microstructure and joining properties of high Nb-containing TiAl alloy brazed joints
英文关键词:TiAl intermetallic  Brazing  Microstructure  Mechanical properties  Fracture
英文摘要:
      High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at.%), abbreviated as TAN alloy) was successfully brazed at 1100 °C using Ti-28Ni (wt.%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ3-Al3Ti2Ni + B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated in detail. The results demonstrated that the diffusion of Ni from molten brazing alloy to TAN substrate played an important role in the interfacial microstructure evolution, which resulted in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicated that the maximum shear strength at room temperature and high temperature (600 °C) reached 248.6 MPa and 166.4 MPa respectively when holding time was 15 min. Fracture analyses revealed that brittle fracture preferred to initiate and propagate in the continuous intermetallic layers during shear test.
作者单位E-mail
宋晓国 哈尔滨工业大学 songxiaoguohit@sohu.com 
司晓庆 哈尔滨工业大学  
曹健 哈尔滨工业大学  
王志权 哈尔滨工业大学  
赵洪运 哈尔滨工业大学  
冯吉才 哈尔滨工业大学  
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