Synthesis and characterization of non-equiatomic Ti0.3AlMoSi0.3W0.1 high-entropy alloy fabricated via spark plasma sintering

Abstract

Failure of aerospace components from extreme operating temperatures due to oxidation in components such as turbine blades and compressor blades results in catastrophic consequences, which mostly lead to loss of lives and economic decline. Hence, a need for new novel materials with good corrosion, oxidation, and wear-resistant properties remains a necessity. Near-equiatomic Ti0.3AlMoSi0.3W0.1 high-entropy alloy (HEA) with enhanced mechanical properties and good corrosion-resistant properties was synthesized by means of spark plasma sintering technology. The influence of spark plasma sintering temperature of developed Ti0.3AlMoSi0.3W0.1 HEA was investigated at 800 °C, 900 °C, and 1000 °C. The microstructural evolution was studied by means of scanning electron microscope (SEM). The Vickers microhardness and wear-resistant properties were evaluated using diamond base microhardness tester (EMCO) and tribometer (Rtec), respectively. The corrosion resistance properties and oxidation resistance of the synthesized HEA were also evaluated in 0.5 M H2SO4 using 101 Autolab potentiostat/galvanostat devices and thermal gravimetric analyzer (TGA), respectively. Heat treatment effect on the synthesized HEA was also studied; the samples were exposed to high temperature of 900 °C in isothermal furnace with holding time of 8 h. From the results, it was found that fabricated HEA showed outstanding microhardness properties and good anticorrosion resistance properties in 0.5-M sulfuric acid medium.