Indian Journal of Engineering & Materials Sciences

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Study on microstructure and mechanical property of Ti-6Al-4V brazed joint with low temperature filler metal


Affiliations
1 Department of Production Engineering, PSG College of Technology, Coimbatore, Tamil Nadu 641004,, India
2 Department of Production Engineering, PSG College of Technology, Coimbatore, Tamil Nadu 641004, India

This study investigates the microstructure and mechanical properties of Ti-6Al-4V brazed joints which has been performed in a vacuum furnace using BAg-22 (Ag–16Cu–23Zn–4.5Ni-7.5Mn, wt. %) as filler metal. The microstructure of the brazed joints has been analyzed by means of optical microscope, scanning electron microscope (SEM) and X-Ray diffraction (XRD). In addition, the mechanical strengths of the joints have been evaluated by shear test and microhardness test. Brazing temperatures employed in this study are 720, 750, and 780 °C for a holding time of 30 min. By increasing the brazing temperature, a variety of intermetallic phases have been formed in the bond area, such as CuTi, CuTi2, Mn2Ti, MnZn2, AgZn and Ag solid solution. Both the brazing temperature and the brazing time seem have critical factors for controlling the microstructure and the better mechanical property of the brazed joints. The maximum shear strength of 154.15 MPa has been achieved at 780 °C and a holding time of 30 min.
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  • Study on microstructure and mechanical property of Ti-6Al-4V brazed joint with low temperature filler metal

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Authors

Santhebachahalli Venkataramu Anil Kumara
Department of Production Engineering, PSG College of Technology, Coimbatore, Tamil Nadu 641004,, India
Rangappan Gandhinathan
Department of Production Engineering, PSG College of Technology, Coimbatore, Tamil Nadu 641004, India

Abstract


This study investigates the microstructure and mechanical properties of Ti-6Al-4V brazed joints which has been performed in a vacuum furnace using BAg-22 (Ag–16Cu–23Zn–4.5Ni-7.5Mn, wt. %) as filler metal. The microstructure of the brazed joints has been analyzed by means of optical microscope, scanning electron microscope (SEM) and X-Ray diffraction (XRD). In addition, the mechanical strengths of the joints have been evaluated by shear test and microhardness test. Brazing temperatures employed in this study are 720, 750, and 780 °C for a holding time of 30 min. By increasing the brazing temperature, a variety of intermetallic phases have been formed in the bond area, such as CuTi, CuTi2, Mn2Ti, MnZn2, AgZn and Ag solid solution. Both the brazing temperature and the brazing time seem have critical factors for controlling the microstructure and the better mechanical property of the brazed joints. The maximum shear strength of 154.15 MPa has been achieved at 780 °C and a holding time of 30 min.