Akademik Veri Yönetim Sistemi
Materials Chemistry and Physics, cilt.345, 2025 (SCI-Expanded, Scopus)
Nickel aluminide (NiAl) alloys produced by spark plasma sintering (SPS) present high potential for high-temperature application due to their superior mechanical and oxidation properties. However, their intrinsic brittleness and susceptibility to wear require treatment of their surface. In this work, the impact of laser-induced remelting (LIR) on the scratch behavior of SPS-processed NiAl alloys under different conditions of processing is studied. The parameters of laser power (30, 50, and 75 W), scanning speed (1000 and 2000 mm/s), and processing atmospheres (air and argon) were modified in sequence to investigate microstructure development and mechanical performance. Thermodynamic simulation of phase stability and solidification paths using Thermo-Calc software determined equilibrium phase stability and solidification paths. Scheil simulations proved Al depletion in remelt zones, which modified phase balance of NiAl and Ni3Al. The phase transition was proved using X-ray Diffractometer (XRD), while microstructure refinement and redistributions in elements were identified using scanning electron microscope (SEM) and energy-dispersive X-ray spectrometer (EDS). The scratch tests indicated that LIR significantly enhanced scratch resistance, which reduced wear depth by up to 40 % at loads of 5 N and 15 N. The smooth topography of surfaces upon remelting was proved using 3D profilometry. The findings indicate high potential of using LIR to generate designed NiAl surface properties for application in aerospace and high-performance engineering.