Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

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 Nb SS /Nb 5 Si 3 in situ composite with the nominal composition of Nb–22Ti–16Si–3Cr–3Al–2Hf was used as the parent material. The joint microstructures were...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2019-09, Vol.32 (9), p.1142-1150
Main Authors: Ren, Xin-Yu, Ren, Hai-Shui, Kang, Yong-Wang, Xiong, Hua-Ping, Pei, Chong, Chen, Bo, Cheng, Yao-Yong, Ustinov, A. I.
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Base metal
Bonded joints
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composite materials
Corrosion and Coatings
Diffusion welding
Hot pressing
Interfacial bonding
Intermetallic compounds
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Molecular composites
Multilayers
Nanotechnology
Nickel aluminides
Nickel base alloys
Nickel compounds
Niobium
Organometallic Chemistry
Reaction products
Room temperature
Shear strength
Shear tests
Silicon base alloys
Spectroscopy/Spectrometry
Temperature
Titanium aluminides
Titanium base alloys
Tribology
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Summary: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 Nb SS /Nb 5 Si 3 in situ composite with the nominal composition of Nb–22Ti–16Si–3Cr–3Al–2Hf 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 AlNb 2  + Ni 3 Al, NiAl and AlNi 2 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.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-019-00906-2