Interfacial microstructure and joining properties of TiAl/Ti₃AlC₂ diffusion bonded joints using Zr and Ni foils as interlayer

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• 作者：Jiakun Liu ; Jian Cao ; Xingtao Lin ; Haiyan Chen ; Jun Wang ; Jicai Feng
• 关键词：Intermetallics ; Ceramics ; Bonding ; Microstructure ; Mechanical properties
• 刊名：Vacuum
• 出版年：April, 2014
• 年：2014
• 卷：102
• 期：Complete
• 页码：16-25
• 全文大小：3959 K

文摘

Diffusion bonding of TiAl intermetallic to Ti₃AlC₂ ceramic was carried out using Zr and Ni foils as interlayer. The interfacial microstructure and joining properties were characterized by electronic microscopy investigation and shear strength test, respectively. The microstructure observations revealed that the general interfacial microstructure of the joint bonded at 850聽掳C was consisted of 纬-TiAl聽+聽蟿₃-Al₃NiTi₂, 蟿₃-Al₃NiTi₂, 蟿₄-AlNi₂Ti, 蟿₄-AlNi₂Ti聽+聽Ni₁₀Zr₇, Ni₇Zr₂, Ni₅Zr, Ni, Ni₃(Al,Ti), Ni₃(Al,Ti)聽+聽Ti₃AlC₂ from TiAl to Ti₃AlC₂. The bonding temperature had a great influence on the diffusion and reaction of Ni with other elements, generating different interfacial morphology of joints. The shear test results showed that the maximum shear strength reached 103.6聽MPa. Fracture occurred along the ceramic substrate adjacent to the bonding interface, showing a brittle intergranular and transgranular fracture mode.