Corrosion and Oxidation Behaviour of Ti-Al Based Alloys Synthesized via Laser <i>In Situ</i> Alloying

Developing titanium aluminides (Ti-Al) based alloys by means of Laser Engineered Net Shaping (LENS) in-situ manufacturing presents attractive properties as compared to other fabrication methods. Ti-Al alloys have attracted much attention for high-temperature performance in gas turbine and automobile applications because of their attractive properties such as low density, high strength, high stiffness, and good oxidation resistance. In this work, laser in-situ fabricated Ti-Al-Nb-Cr quaternary alloys were developed. The samples were exposed to 1350°C and cooled in air for stress relief and for homogenizing phase distribution before characterization, corrosion behaviour and oxidation properties were investigated. From the electrochemical performance results, sample QT1 and QT2 displayed high potential and high current densities with the values of-0.33931V, -0.36934V and 5.77E-05A/cm 2 , 4.89E-05A/cm 2 , respectively and the corroded SEM proves that the samples had minimal structural damage. The minimum mass gain was observed during oxidation test proving that Ti-Al-Nb-Cr alloys have outstanding oxidation properties for potential high temperature application.