Assessing the nanomechanical, wear and thermal stability of Ti-Al-Si-V alloys produced via laser engineered net shaping (LENS) in-situ alloying

• Published in: MATEC web of conferences 2024, Vol.406, p.3001
• Main Authors: Raji, Sadiq Abiola, Popoola, Abimbola Patricia Idowu, Pityana, Sisa Leslie, Tlotleng, Monnamme
• Format: Article
• Language: English
• Subjects: Alloying elements; Alloys; Aluminum base alloys; Feed rate; Heat treatment; Intermetallic compounds; Lenses; Mechanical properties; Metal powders; Nanoindentation; Nickel base alloys; Silicon; Superalloys; Thermal stability; Titanium aluminides; Titanium base alloys; Tribology; Vanadium
• ISSN: 2261-236X; 2274-7214; 2261-236X
• DOI: 10.1051/matecconf/202440603001

Titanium aluminide (TiAl) intermetallic alloys are highly recognized because of their lightweight qualities and are particularly useful for replacing heavier Nickel-based (Ni-based) superalloys in high- temperature components. This study fossed on the investigation of the nanomechanical, wear, and thermal stability of intermetallic Ti-Al-Si-V alloys fabricated by in situ alloying with elemental metal powders using the laser engineered net shaping (LENS) technology. The impact of Vanadium (V) feed rate was examined both before and during the annealing heat treatment, which involved 60mins at temperatures of 1200 and 1400°C, and furnace cooling (FC) conditions. After heat treatment (1200°C and 1400°C), it was discovered that V addition enhances the Ti-Al-Si-V alloy's nanomechanical properties. According to the nanoindentation results, the mechanical characteristics of the heat-treated samples were typically better than those of the as-deposited alloy and were equivalent to the qualities of commercially available TiAl alloys. The alloy that was heat-treated at a temperature of 1200°C exhibited better tribological and thermal stability. Lastly, the as-deposited sample performed better in terms of tribological and thermal stability aspects than the sample that was heat-treated at 1400°C.