Effect of treatment solution on the microstructure and microhardness of ternary Ni-Al-Nb alloy doped with titanium

Nickel-based superalloys have been widely used in various applications, which require high strength at high temperatures. Most types of these superalloys is age-hard enable because they have γ' particles' chemical composition Ni₃ (Al, Ti) in γ' - phase matrix. This research will be used alloy Ni-Al-Nb added alloying elements Ti. This research was conducted to study the mechanical properties, microstructure conditions in some alloys Ni-Al-Nb added distinction Titanium element (0,5 % and 1 % Ti) using the method of aging temperature variation performed at a temperature of 650 °C, 700 °C and 750 °C with a holding time 4 hours and air cooling. Tests were conducted to determine the characterization of the specimen includes testing metallographic optical microscope, Rockwell hardness C and SEM- EDS, XRD. Results obtained from this research that addition of titanium element affecting the hardness values as well as the results of the cast, solution treatment and aging process results. The 1 % Titanium content can affect the gamma prime coarsening and make the grain on the microstructure result smooth. (author)