Investigation of Mechanical Properties of Transient Liquid Phase bonding of Inconel738 Nickel base superalloy to TiAl Intermetallic compound

Transient Liquid pahse (TLP) bonding was used to join a nickel base superalloy Inconel 738 in as -cast condition to TiAl intermetallic compound by using two different interlayer MBF30 and pure Cu with 50micron thickness. TiAl intermetallic was casted of titanium and aluminum with 99.9% purity by Vacuum Arc Melting(VAR) furnace. Bonding were carried out in vacuum atmosphere at temperature range between 1120-1150 with different bonding times. Bonding microstructure was studied by light and scanning electron microscopes. Microstructural evaluation was depicted some intermetallic compounds had been appeared. With bonding at higher temperatures or bonding times has been disappeared or discontinued. By increasing bonding time, amount of eutectic structure was decreased gradually and continuous eutectic phases are disappeared at 1150 and 10 minutes. Results show that the microstructure of bond area has different complex composition and phases in spite of their discontinuities. Mechanical properties show that the hardness of the bonding area because of brittle boride and carbide phases that are formed in that area is higher than near the base materials areas. The shear strength of MBF-30 bonded samples are higher than Cu interlayer bonded samples.

کلیدواژه ها:

Inconel 738 ، Titanium aluminide ، TLP Bonding ، Intermetallic compound