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علي شانقي

علی شانقی

مرتبه علمی: دانشیار
نشانی:
تحصیلات: دکترای تخصصی / مهندسی موادخوردگی
تلفن:
دانشکده: دانشکده فنی مهندسی

مشخصات پژوهش

عنوان
Study of the Mechanical Properties of NiTi Modified by Carbon Plasma Immersion Ion Implantation Using Nano-Indentation Test and Finite Element Method Simulation
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
carbon plasma immersion ion implantation, NiTi alloy, nano-mechanical properties, nanoindentation, finite element method
سال
2022
مجله PHYSICS OF METALS AND METALLOGRAPHY
پژوهشگران علی شانقی ، علیرضا سوری

چکیده

Plasma immersion ion implantation is one of the common methods to enhance the corrosion resistance, mechanical properties, and biological characteristics of NiTi alloys. Herein, the nano-mechanical behavior and distribution of compressive and tensile stress of NiTi alloy samples modified by carbon plasma immersion ion implantation (C-PIII) are analyzed by atomic force microscopy (AFM), nano-indentation test, and finite element method (FEM) simulation. C-PIII produces a modified layer with a thickness of 48 nm. The average surface roughness decreases from 34.023 to 25.180 nm and the hardness and Young’s modulus increase to 80.7 and 21.8%, respectively, after C-PIII. FEM simulation reveals that elastic and plastic deformation similar to that observed experimentally arises from the increase in strength and changes in the surface phases stemming from C-PIII. The larger Young’s modulus and hardness of the C-PIII sample reduces the penetration depth and plastic strain during nano-indentation resulting in a decrease of the compressive residual stress by 46% from –0.619 to –0.313 GPa at the tip of the indenter. Our results show that the durability and service lifetime of NiTi alloys can be improved by C-PIII thus boding well for biomedical applications in harsh environments such as blood vessel stents and bone joints.