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Microstructure evolution and mechanical properties of high Nb–TiAl alloy/GH4169 joints brazed using CuTiZrNi amorphous filler alloy
Intermetallics ( IF 4.3 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.intermet.2021.107351
Duo Dong 1, 2 , Kangqiao Shi 3 , Dongdong Zhu 2 , Yongfeng Liang 1 , Xiaohong Wang 2 , Zunjie Wei 4 , Junpin Lin 1
Affiliation  

A CuTiZrNi amorphous filler metal was fabricated and utilized for brazing high Nb–TiAl alloys and GH4169 superalloys. The microstructure and mechanical properties of the high Nb–TiAl/GH4169 joints brazed from 900 °C to 1020 °C temperature range were studied. Results showed that the high Nb–TiAl/GH4169 joints consisted of three zones. The interfacial microstructure of the joints was high Nb–TiAl alloy/Ti3Al + Al3(Ni, Cu)Ti2 + Al(Ni, Cu)2Ti/AlCu2(Ti, Zr) + (Ti, Zr)(Ni, Cu) + Ti2(Ni, Cu)/Cr-rich (Cr, Ni, Fe)ss + Ni-rich (Ni, Cr, Fe)ss/GH4169 alloy. The element diffusion between the substrates and the filler alloy was intensified as the brazing temperature increased, and the interfacial reaction layer thickened. At 960 °C, the joint exhibited a maximum shear strength which was approximately 241.9 MPa. At higher brazing temperatures, the excessive AlCu2(Ti, Zr) phase and coarse Ti2(Ni, Cu) deteriorated the joint properties due to their inherent brittleness.



中文翻译:

CuTiZrNi非晶钎料钎焊高Nb-TiAl合金/GH4169接头的组织演变及力学性能

制造了一种 CuTiZrNi 非晶填充金属并用于钎焊高 Nb-TiAl 合金和 GH4169 高温合金。研究了在 900 °C 到 1020 °C 温度范围内钎焊的高 Nb-TiAl/GH4169 接头的微观结构和机械性能。结果表明,高 Nb-TiAl/GH4169 接头由三个区域组成。接头界面显微组织为高Nb-TiAl合金/Ti 3 Al + Al 3 (Ni, Cu)Ti 2  + Al(Ni, Cu) 2 Ti/AlCu 2 (Ti, Zr) + (Ti, Zr)( Ni, Cu) + Ti 2(Ni, Cu)/富铬 (Cr, Ni, Fe)ss + 富镍 (Ni, Cr, Fe)ss/GH4169 合金。随着钎焊温度的升高,基体与钎料之间的元素扩散加剧,界面反应层增厚。在 960 °C 时,接头的最大剪切强度约为 241.9 MPa。在较高的钎焊温度下,过量的 AlCu 2 (Ti, Zr) 相和粗大的 Ti 2 (Ni, Cu) 由于其固有的脆性而降低了接头性能。

更新日期:2021-09-20
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