## 1 Introduction
Recently, there are studies that develop in situ alloyed metallic structures from either elemental powders, and metallic powder and wire as feedstock. This research method is a development towards tailored microstructures and intended applications for structures with improved properties which can adapt and have memories. This field of research (laser alloy development) is new and in its infancy, however, it is receiving tremendous attention given its economic benefits and freedom of manufacturing [4]. From limited published literature studies, R&D on alloy development by means of laser, as a heat source, are concerned mainly with reactive synthesis of intermetallic alloys including titanium aluminides (Ti-Al) for aerospace, energy, and automotive industries; Nitinols (Ni-Ti) for biomedical industry and high entropy alloys for electronics; and research studies that are concerned with the characteristics of the melt pool and its dynamics (thermal and kinetics). The benefit from these studies would evolve a system that is able to 3D print crack sensitive alloys such as Ti-Al, Ni-Ti, and high entropy alloys which are currently found to be difficult to manufacture into components with traditional methods including certain 3D printing platforms. Arcam EBM Spectral H is a revolutionary machine that can 3D print crack-free, stress relieved components with improved material properties such as wrought and better than cast. This machine takes into consideration all the requirements for 3D printing crack-sensitive alloys. This Arcam machinery uses multiple beams as a beam source, and processing occurs inside a vacuum at high temperature. Ti-Al rotor blades that were 3D printed using this machine have undergone testing and will go into the GEnx and GE9X for Boeing's Dreamliner 747-8 aircraft and Boeing's next-generation long-haul plane (The 777X), respectively. This achievement solves the machine aspects of printing Ti-Al alloys but does not account for the aspect of in situ alloying that would be necessary for alloy tweaking, microstructural tailoring, and building of smart functional parts that are adaptive. To engineer such structures, DED machines are best suited since alloying using PB platforms is still not understood, or it is not a straightforward process. DED has advantages since it can feed both elemental powders, wires, and a combination of these feedstocks [5]. Ti-Al alloys are regarded as the best aeronautical structural materials due to their lightweight and extensive thermo-mechanical properties. The United State Patent no 5,415,831, dated 16 May 1995, revised the following: \"alloys based on doped intermetallics are acquiring increasing importance in materials technology. This is because doped intermetallics, particularly aluminides, possess high strength regardless of their low density\". Gamma (\(\gamma\)) Ti-Al is superior, in specific strength, to nickel (Ni) base super-alloys at temperatures of about 800-900 \({}^{\circ}\)C, but they have limited room temperature ductility, and are sensitive to process selection and conditions [6; 7; 8; 9]. Despite these observations, General Electric (GE) Ti-48 Al-2 Nb-2 Cr or 48-2-2 alloy has been reported to have commercial use in the GENx-family engines produced by GE Aircraft Engines [3; 10]. To date, this is the most successfully researched, developed, and commercialized alloy, followed by the Helmholtz Association of German Research Centres (GKSS, Germany) Ti-48 Al-9 Nb alloy, which is commercially unavailable. The Ti-48 Al-9 Nb alloy is mainly used for manufacturing parts that are used in high temperature applications, whereas 48-2-2, in addition to being a high temperature application alloy, has to some degree room temperature ductility [11]. There are several studies that have reported the required process setting to achieve crack-free parts manufactured from commercially available Ti-Al alloys. [PERSON] et al.