Brazing TiAl intermetallics using TiNi-V eutectic brazing alloy

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• 作者：X.G. Song^a ; ^b ; J. Cao^a ; ^{cao_jian@hit.edu.cn} ; H.Y. Chen^a ; Y.F. Wang^a ; J.C. Feng^a
• 关键词：Intermetallics ; Brazing ; TiNi&ndash ; V eutectic brazing alloy ; Interfacial microstructure ; Mechanical properties
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：15 August, 2012
• 卷：551
• 期：Complete
• 页码：133-139
• 文件大小：2192 K

摘要

A novel TiNi-V25 (at.%) eutectic brazing alloy, which was composed of TiNi intermetallics and V, was designed and fabricated. Subsequently, the brazing alloy was used to braze TiAl intermetallics (Ti-42.5Al-9V-0.3Y (at.%)) and reliable joints were obtained. The typical interfacial microstructure of TiAl brazed joints was characterized by employing SEM, EDS and XRD, and the brazing mechanism was analyzed in detail. The brazed joints mainly consisted of B2 phase and 蟿₃-Al₃NiTi₂ intermetallics. Interfacial morphology of TiAl joints varied with the increase of brazing temperature, while the phase constitution in joints did not change sound TiAl joints with the highest average shear strength of 196 MPa were obtained when the specimens were brazed at 1220 掳C for 10 min. The presence of B2 phase and 蟿₃-Al₃NiTi₂ intermetallics in joints deteriorated the joining properties due to their brittleness, which led to cleavage-dominated fracture after shear test. The crack propagation path and fracture location were mainly determined by the content and distribution of 蟿₃-Al₃NiTi₂ phase.