Abstract
The microstructure, mechanical and corrosion properties of Nickel-Titanium-Copper shape memory alloy were inspected in this research. The Ni46-Ti50-Cu4alloy was prepared based on the powder metallurgy method, then mixed and cold-pressed at (600, 700, and 800) MPa, respectively, to form cylindrical samples of 11mm diameter × 16.5mm length. After pressing, the samples got sufficient green strength for handling. The specimens were consequently sintered at (850,900 and 950) °C for five hours in an electric vacuum tube furnace. The optimum compacting pressure and sintering temperature were identified using the Minitab program. The effect of optimum parameters on the shape memory was 83.5 % at a temperature of sintering of 850°C and a pressure of compacting 800 MPa. Samples prepared under the optimum process conditions were then irradiated utilizing a pulsed ND: YAG laser at 300mJ, 400mJ, 500mJ, and 600mJ. Multiple tests were conducted on the alloys, including shape memory effect, porosity measurements, scanning electron microscopy (SEM), and corrosion rate test. The results indicated that decrease the corrosion rate after laser processing. The lowest value of the rate of corrosion was obtained when the energy of laser irradiation was 500, which corresponds to the structural and physical properties.
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