Zain, EMAbdelwahed, MYoussef, AFElsabbagh, AMPityana, Sisa LTaha, MA2025-07-292025-07-292025-07https://doi.org/10.7759/s44388-02505410-13005-1479http://hdl.handle.net/10204/14333Elementary powder of nickel (Ni) and titanium (Ti) were deposited on the surface of a Ti-6Al-4V alloy substrate by direct laser deposition. By varying laser parameters such as power and scan speed, we investigated how these factors affect phase formation, hardness, elastic modulus, and elastic recovery. Microstructural analysis revealed dendritic structure in most specimens, with variations in the formation of second phase precipitates, such as TiNi2 and TiNi3, depending on the processing conditions. Specimens processed with higher laser energy had fewer dendritic structures. A nanoindentation test was carried out to assess the hardness and elastic recovery of the specimens, showing differences in mechanical properties linked to the processing parameters, and it revealed that specimens processed with higher laser energy exhibited superior mechanical properties, with a recovery index reaching 30% in some cases that includes laser power of 1.25 Kw and scan speed of 1.5 m/min. When the optimized laser parameters were used, more homogeneous phases were formed, enhancing both hardness and elasticity. This study shows that direct laser deposition can be adjusted to improve the performance of NiTi alloys for applications that need high strength and elasticity.FulltextenNitinolShape memory alloyAdditive manufacturingHardnessMicrostructureArticlen/a