Study of the Mechanical Properties of NiTi Modified by Carbon Plasma Immersion Ion Implantation Using Nano-Indentation Test and Finite Element Method Simulation

被引:1
|
作者
Shanaghi, A. [1 ]
Siyavoshi, A. [1 ]
Souri, A. R. [1 ]
Shanaghi, Ab [2 ]
Chu, P. K. [3 ,4 ]
机构
[1] Malayer Univ, Fac Engn, Mat Engn Dept, Malayer, Iran
[2] Islamic Azad Univ, Fac Engn, Elect Engn Dept, Sci & Res Branch, Tehran, Iran
[3] City Univ Hong Kong, Dept Phys, Dept Mat Sci & Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
[4] City Univ Hong Kong, Dept Biomed Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
来源
PHYSICS OF METALS AND METALLOGRAPHY | 2022年 / 123卷 / 13期
关键词
carbon plasma immersion ion implantation; NiTi alloy; nano-mechanical properties; nano-indentation; finite element method; SURFACE MODIFICATION; BIOCOMPATIBILITY; CORROSION; TEMPERATURE; HARDNESS; ALLOYS;
D O I
10.1134/S0031918X21100574
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
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.
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页码:1395 / 1401
页数:7
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