2018, Soltani, M.
THESIS (MSc, 2016-2018): Transient liquid phase (TLP) bonding of Ni3Al intermetallic with AWS BNi-2 interlayer
In this study, the Ni3Al intermetallic compound was joined by transitional liquid phase process with a AWS BNi-2 interlayer. The joining was carried out at a vacuum furnace at 1050 °C at different holding times, ranging from 30 to 120 min. The bonding region was investigated by electron and optical microscopes. Investigations showed that no isothermally solidified zone was formed for holding times up to 120 min. Increasing holding times results in a reduction in the amount of brittle phases, present at the joint. Investigation of microhardness variation in different regions across the interface showed a significant hardness increase up to 772 VHN due to the hard phases of nickel and chromium boride at the center line of joint. The shear strength of the joint was investigated by shear test. The results showed that shear strength increased with increasing holding time. Investigation of the fracture surfaces was also carried out by an electron microscope, showing that the failure occurred in a brittle manner.
Papers:
- Effects of boron addition on the microstructure and mechanical properties of vacuum arc remelted Ni3Al intermetallic, iMat Conference 2018, Tehran
