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Joining of Ti6Al4V to Al2O3 Using Nanomultilayers.
Marcionilo Silva1,2,3, Ana Sofia Ramos3, Maria Teresa Vieira3
1Department of Mechanical Engineering, Federal University of Amazonas, General Rodrigo Octavio Jordão Ramos ST., Manaus 69067-005, Brazil.
Nanomaterials (Basel, Switzerland)
|February 26, 2022
Summary
Nickel/Titanium (Ni/Ti) reactive nanomultilayers enable successful diffusion bonding of titanium alloy (Ti6Al4V) to aluminum oxide (Al2O3). These interlayers facilitate sound interfaces at reduced temperatures, improving dissimilar material joining.
Area of Science:
- Materials Science
- Metallurgy
- Nanotechnology
Background:
- Diffusion bonding is crucial for joining dissimilar materials like Ti6Al4V and Al2O3.
- Traditional methods often require high temperatures and can result in brittle interfaces.
- Reactive nanomultilayers offer a potential solution for enhanced interfacial properties.
Purpose of the Study:
- To investigate the use of Ni/Ti reactive nanomultilayers as interlayers for diffusion bonding Ti6Al4V to Al2O3.
- To characterize the microstructure and mechanical properties of the resulting interfaces.
- To determine the optimal processing conditions for achieving sound joints.
Main Methods:
- Deposition of Ni/Ti multilayer thin films with varying modulation periods (12, 25, 60 nm) using d.c. magnetron sputtering.
- Diffusion bonding of Ti6Al4V to Al2O3 at 750 °C and 800 °C under 5 MPa pressure for 60 min.
- Microstructural analysis using scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD).
- Mechanical characterization via nanoindentation to map hardness and reduced Young's modulus.
Main Results:
- Successful diffusion bonding of Ti6Al4V to Al2O3 was achieved at 800 °C with all modulation periods.
- Sound interfaces were obtained at a reduced temperature of 750 °C using 25 and 60 nm modulation periods.
- Interfaces primarily consisted of NiTi and NiTi2 phases.
- Nanoindentation results correlated hardness and modulus with the observed interfacial microstructure.
Conclusions:
- Ni/Ti reactive nanomultilayers are effective interlayers for diffusion bonding Ti6Al4V to Al2O3.
- The modulation period of the nanomultilayers influences the bonding temperature required for sound joint formation.
- The developed method offers a promising route for joining dissimilar materials with improved interfacial properties.
