Microstructure and Mechanical Properties of Heat-Treated Ti-Al-Si Alloy Produced via Laser In Situ Alloying

Influence of Mo on microstructure and nanoindentation hardness of Ti-Al-Si-xMo alloy processed by Laser Engineered Net Shaping (LENS)

“…Meanwhile, the HIP is a post-processing step that is expensive to realize and extending production time. Thus, to produce fully dense parts that are pore and crack-free there is the need to control the processing involved in AM technologies (Raji et al 2020(Raji et al , 2021.…”

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This problem mainly relates to the inherent properties of TiAl being prone to high stress-induced cracking (Raji et al 2019(Raji et al , 2020(Raji et al , 2021. This is caused by high cooling rates in AM technologies that easily induce cracks, while accumulation of excessive thermal energy through processing also results in the development of other defects like porosities (Raji et al 2019(Raji et al , 2020(Raji et al , 2021Svetlizky et al 2020). Moreover, the lightweight nature of TiAl alloys with density of about 3.8 g/cm 3 still makes them desirable for airplane engine components (Gao and Wang, 2021;Oehring et al 2021;Raji et al 2021).

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“…This is caused by high cooling rates in AM technologies that easily induce cracks, while accumulation of excessive thermal energy through processing also results in the development of other defects like porosities (Raji et al 2019(Raji et al , 2020(Raji et al , 2021Svetlizky et al 2020). Moreover, the lightweight nature of TiAl alloys with density of about 3.8 g/cm 3 still makes them desirable for airplane engine components (Gao and Wang, 2021;Oehring et al 2021;Raji et al 2021). Also, TiAl-based alloys possess excellent properties such as high strength-to-weight ratio, high strength retention at elevated temperatures, excellent high-temperature stiffness, low density and good creep properties (Raji et al 2020(Raji et al , 2021Xu et al 2020).…”

“…Moreover, the lightweight nature of TiAl alloys with density of about 3.8 g/cm 3 still makes them desirable for airplane engine components (Gao and Wang, 2021;Oehring et al 2021;Raji et al 2021). Also, TiAl-based alloys possess excellent properties such as high strength-to-weight ratio, high strength retention at elevated temperatures, excellent high-temperature stiffness, low density and good creep properties (Raji et al 2020(Raji et al , 2021Xu et al 2020). These attractive mechanical properties give a high prospect to TiAlbased in substituting the heavier nickel-based superalloys typically applied in producing turbine parts of aircraft engines (Kim et al 2019;Raji et al 2020;Xu et al 2020).…”

Modelling and simulation of the fatigue usage factor of γ-TiAl alloy fabricated through Laser Additive Manufacturing (LAM)

“…Intermetallic titanium aluminide-based (TiAl-based) alloys have fascinated researchers working in the automotive and aerospace industries owing to their properties such as excellent oxidation resistance, good elastic modulus, high strength, good creep resistance and most importantly low density (Raji et al 2019(Raji et al , 2020(Raji et al , 2021Verma et al 2017; Wang et al 2020). Nevertheless, TiAl alloys' ductility at ambient temperature is very poor, thereby limiting its production through wrought procedures like forging; while anisotropic mechanical properties are obtained for cast TiAl-based alloys due to coarse microstructures and unpredictable defects (Ismael and Wang, 2019; Raji et al 2020).…”