Enhancing Mechanical Performance of NiTi Shape Memory Alloys via Niobium and Copper Additions
الموضوعات : Solid Mechanics
Yasaman Ghasemi
1
,
Hossein Mahbadi
2
,
Fariborz Heidary
3
1 - Department of Engineering, CT.C., Islamic Azad University, Tehran, Iran.
2 - Department of Engineering, CT.C., Islamic Azad University, Tehran, Iran.
3 - Department of Engineering, CT.C., Islamic Azad University, Tehran, Iran.
الکلمات المفتاحية: Ni-40Ti-xCu-yNb, Mechanical Properties, Simulation, Nickel Superalloys,
ملخص المقالة :
Nickel-titanium alloys are used in industrial and medical applications due to their outstanding properties such as high corrosion resistance, biocompatibility and superelastic behavior, which can withstand large reversible deformations without permanent deformation. This study investigates the improvement of mechanical properties and structural behavior of nickel-titanium alloys by adding different concentrations of copper and niobium. The addition of copper has a significant effect on the density of the alloy, which leads to an increase in shape memory properties, and the tensile strength and hardness are slightly affected, indicating good structural stability, and the Young's modulus and shear modulus also decrease with increasing weight percentage of copper. The addition of niobium modifies the phase structures in the alloy. Also, the optimized hysteresis loop shows a significant increase in the mechanical strength and yield stress and deformation range of the alloy compared to the reference sample, such that the accumulation of plastic strain in one cycle is reduced compared to the pure nitinol alloy and the elastic deformation capacity is increased. Cyclic loading of improved nitinol compared to pure nitinol reduces ratcheting effects and leads to greater cyclic stability, which ultimately leads to improved vibration behavior of the structure. The best alloy composition contains 2.5% copper and 6% niobium, which shows better mechanical properties than pure nitinol, making it a promising candidate for medical and automotive applications where high performance and reliability are essential.
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