Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers
来源期刊：Acta Metallurgica Sinica2019年第9期
论文作者：Xin-Yu Ren Hai-Shui Ren Yong-Wang Kang Hua-Ping Xiong Chong Pei Bo Chen Yao-Yong Cheng A.I.Ustinov
文章页码：1142 - 1150
摘 要：Diffusion bonding of refractory Nb–Si-based alloy was performed with Ni/Al and Ti/Al nanolayers under the condition of 1473 K/30 MPa/60 min. The NbSS/Nb5Si3 in situ composite with the nominal composition of Nb–22 Ti–16 Si–3 Cr–3 Al–2 Hf was used as the parent material. The joint microstructures were examined by using a scanning electron microscope equipped with an X-ray energy dispersive spectrometer. Shear test was conducted for the bonded joints at room temperature.Within the joint bonded with Ni/Al multilayer, element diffusion occurred between the base metal and the nanolayer, with the reaction products of AlNb2 + Ni3 Al, NiAl and AlNi2 Ti phases. The average shear strength was 182 MPa. While using Ti/Al multilayer, the interface mainly consisted of TiAl,（Ti,Nb）Al and（Ti,Nb）2 Al phases, and the corresponding joints exhibited an increased strength of 228 MPa. In this case, the fracture mainly took place in the TiAl phase and presented a typical brittle characteristic.
Xin-Yu Ren1，Hai-Shui Ren1，Yong-Wang Kang2，Hua-Ping Xiong1，Chong Pei1，Bo Chen1，Yao-Yong Cheng1，A.I.Ustinov3
1. Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials3. E.O. Paton Electric Welding Institute of NAS of Ukraine
摘 要：Diffusion bonding of refractory Nb–Si-based alloy was performed with Ni/Al and Ti/Al nanolayers under the condition of 1473 K/30 MPa/60 min. The NbSS/Nb5Si3 in situ composite with the nominal composition of Nb–22 Ti–16 Si–3 Cr–3 Al–2 Hf was used as the parent material. The joint microstructures were examined by using a scanning electron microscope equipped with an X-ray energy dispersive spectrometer. Shear test was conducted for the bonded joints at room temperature.Within the joint bonded with Ni/Al multilayer, element diffusion occurred between the base metal and the nanolayer, with the reaction products of AlNb2 + Ni3 Al, NiAl and AlNi2 Ti phases. The average shear strength was 182 MPa. While using Ti/Al multilayer, the interface mainly consisted of TiAl,（Ti,Nb）Al and（Ti,Nb）2 Al phases, and the corresponding joints exhibited an increased strength of 228 MPa. In this case, the fracture mainly took place in the TiAl phase and presented a typical brittle characteristic.
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