Heat-treatment effect on anti-corrosion behaviour and tribological properties of LENS in-situ synthesized titanium aluminide

The electrochemical corrosion behaviour of Ti-48Al-2Nb-0.7Cr-0.3Si alloy in 3.5%NaCl

“…These materials are ideal for replacing nickel-based super-alloys in low-pressure turbine blades within the aerospace industry due to their low density and high strength [5]. Furthermore, TiAl-based alloys exhibit excellent corrosion resistance when compared to titanium alloys such as Ti6Al4V and that is attributed to high aluminium (Al) content within the alloy matrix [6]. The Al has the capability of forming a surface protective alumina layer (Al2O3) which is responsible for shielding the materials from further corrosion [7].…”

“…Even though TiAl-based alloys retain interesting mechanical properties, they suffer from poor ductility and fracture toughness at room temperature [8,9]. Such room temperature ductility limits the fabrication of these alloys [6]. The addition of the alloying elements such as Nb, Cr, and Si, to TiAl-based alloys, is known to improve their low-temperature ductility, solute solution strengthening, and oxidation resistance [10][11][12][13].…”

Microstructural evolution and nano-mechanical properties of Ti-Al-based alloys synthesized by laser in-situ alloying

“…Titanium aluminides (Ti-Al) alloys centered on the γ-TiAl phase have presented numerous benefits such as low density, high specific strength, and excellent resistance against oxidation, creep, and corrosion [1]. For that reason, γ-TiAl alloys are favorable hightemperature structural materials in the aerospace engines field, such as compressor blades, turbine wheels, and pistons [2][3][4][5]. However, due to their poor ductility at room temperature, Ti-Al structural components are puzzling to manufacture [6][7][8].…”

“…The addition of chromium (Cr) was noted to have a beneficial effect on the Ti-Al matrix [10,11]. Laser additive manufacturing (LAM), also known as 3D printing, which achieves material printing by piling incremental melt pools of materials layer by layer offers a new path for the synthesizing of Ti-Al-based alloys and complex components [5,12]. Here, additive manufacturing is known to be more economical than conventional methods.…”

“…According to the Ti-Al binary phase diagram different heat treatment temperatures and strategies can be used to produce different microstructures. This is dependent on the method of cooling and the aluminium content present in the alloy or composition [5,7,19,20].…”