Premium
Effects of laser shock peening on the corrosion behavior and biocompatibility of a nickel–titanium alloy
Author(s) -
Zhang Ruixia,
Mankoci Steven,
Walters Nicholas,
Gao Hongyu,
Zhang Hao,
Hou Xiaoning,
Qin Haifeng,
Ren Zhencheng,
Zhou Xianfeng,
Doll Gary L.,
Martini Ashlie,
Sahai Nita,
Dong Yalin,
Ye Chang
Publication year - 2019
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.34278
Subject(s) - materials science , biocompatibility , nickel titanium , corrosion , metallurgy , alloy , peening , titanium , simulated body fluid , composite material , shape memory alloy , scanning electron microscope , residual stress
Nickel–titanium (NiTi) alloy is an attractive material for biomedical implant applications. In this study, the effects of laser shock peening (LSP) on the biocompatibility, corrosion resistance, ion release rate and hardness of NiTi were characterized. The cell culture study indicated that the LSP‐treated NiTi samples had lower cytotoxicity and higher cell survival rate than the untreated samples. Specifically, the cell survival rate increased from 88 ± 1.3% to 93 ± 1.1% due to LSP treatment. LSP treatment was shown to significantly decrease the initial Ni ion release rate compared with that of the untreated samples. Electrochemical tests indicated that LSP improved the corrosion resistance of the NiTi alloy in simulated body fluid, with a decrease in the corrosion current density from 1.41 ± 0.20 μA/cm 2 to 0.67 ± 0.24 μA/cm 2 . Immersion tests showed that calcium deposition was significantly enhanced by LSP. In addition, the hardness of NiTi alloy increased from 226 ± 3 HV before LSP to 261 ± 3 HV after LSP. These results demonstrated that LSP is a promising surface modification method that can be used to improve the mechanical properties, corrosion resistance and biocompatibility of NiTi alloy for biomedical applications. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 1854–1863, 2019.