Abstract
Titanium aluminide (TiAl) is one of the most promising materials for aerospace applications. It is a suitable replacement for nickel-based superalloys predominantly used in these applications. Titanium aluminide with superior processability is the main task in carrying out this work. A less brittle TiAl alloy was fabricated using spark plasma sintering by adding the nominal composition (2.5, 5, and 7.5 wt.%) of manganese (Mn) to Ti-48Al-2Cr-2Nb. The samples were sintered at 1150 °C using spark plasma sintering (SPS), which helped produce highly dense models with fine grain sizes at the high heating rate (here, 100 °C per minute). The effects produced by Mn additions on the densification, mechanical properties (yield strength, hardness, and % elongation), and microstructure of the Ti aluminide alloys are studied. Scanning electron microscopy (SEM) has been used to explore the sintered samples’ microstructures. The alloyed materials are entirely dissolved in the gamma matrix due to the manganese approaching its melting point. XRD and SEM analysis confirmed the new intermetallic related to Mn neither with titanium nor aluminum. The enhancement of % elongation at break is evident for the little improvement in the ductility of TiAl by the addition of Mn. The samples’ tensile fracture nature is also evidence for enhancement in the alloy’s % elongation.
Highlights
In the automobile industry, power generators, and aircraft engines, titanium aluminides have overwhelming applications
By varying the Mn content (0 to 7 wt.%) in the pre-alloyed Ti-48Al-2Cr-2Nb powder, four alloys are fabricated using spark plasma sintering at 1150 °C under uniaxial pressure
It is found that the microstructures and mechanical properties of the Ti-48Al-2Cr-2Nb alloys are significantly affected by the different concentrations of Mn
Summary
Power generators, and aircraft engines, titanium aluminides have overwhelming applications. Ti aluminides have demonstrated their significance in the alloy category, especially in the aviation industry. Extensive analysis was carried out over long periods on applying these alloys [1]. Ti-Al-based alloys, which include titanium aluminides, have attracted many researchers since they have good high-temperature performance and are lightweight. A useful application of Ti–48Al–2Cr–2Nb is found in the blades of low-pressure turbines in aircraft engines. The properties of Ti aluminide alloys depend on the changes in the microstructure, the phases present (here, γ (TiAl) + α2 (Ti3 Al)), and on the type of sintering process and the cooling rate
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