title: Surface amorphization of NiTi alloy induced by Ultrasonic Nanocrystal Surface Modification for improved mechanical properties.
abstract: We report herein the effects of Ultrasonic Nano-crystal Surface Modification (UNSM), a severe surface plastic deformation process, on the microstructure, mechanical (hardness, wear), wettability and biocompatibility properties of NiTi shape memory alloy. Complete surface amorphization of NiTi was achieved by this process, which was confirmed by X-ray diffraction and high-resolution transmission electron microscopy. The wear resistance of the samples after UNSM processing was significantly improved compared with the non-processed samples due to increased surface hardness of the alloy by this process. In addition, cell culture study demonstrated that the biocompatibility of the samples after UNSM processing has not been compromised compared to the non-processed sample. The combination of high wear resistance and good biocompatibility makes UNSM an appealing process for treating alloy-based biomedical devices.
authors.affiliation: Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States. Electronic address: cye@uakron.edu.
authors.forename: Chang
authors.initials: C
authors.lastname: Ye
authors.affiliation: Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States; Department of Polymer Science, University of Akron, Akron, OH 44325, United States.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States.
authors.forename: Abhishek
authors.initials: A
authors.lastname: Telang
authors.affiliation: School of Engineering, University of California - Merced, Merced, CA 95343, United States.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Gao
authors.affiliation: Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States.
authors.forename: Zhencheng
authors.initials: Z
authors.lastname: Ren
authors.affiliation: Timken Engineered Surfaces Laboratories, University of Akron, Akron, OH 44325, United States.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Qin
authors.affiliation: Qatar Environment and Energy Research Institute (QEERI), Qatar Foundation, Doha, Qatar.
authors.forename: Sergey
authors.initials: S
authors.lastname: Suslov
authors.affiliation: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States.
authors.forename: Amrinder S
authors.initials: AS
authors.lastname: Gill
authors.affiliation: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States.
authors.forename: S R
authors.initials: SR
authors.lastname: Mannava
authors.affiliation: Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080-3021, United States.
authors.forename: Dong
authors.initials: D
authors.lastname: Qian
authors.affiliation: Timken Engineered Surfaces Laboratories, University of Akron, Akron, OH 44325, United States.
authors.forename: Gary L
authors.initials: GL
authors.lastname: Doll
authors.affiliation: School of Engineering, University of California - Merced, Merced, CA 95343, United States.
authors.forename: Ashlie
authors.initials: A
authors.lastname: Martini
authors.affiliation: Department of Polymer Science, University of Akron, Akron, OH 44325, United States; Department of Geology, University of Akron, Akron, OH 44325, United States; Integrated Bioscience, University of Akron, Akron, OH 44325, United States.
authors.forename: Nita
authors.initials: N
authors.lastname: Sahai
authors.affiliation: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States.
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Vasudevan
mesh_terms: D000497:Alloys / Q000737:chemistry* / Q000494:pharmacology; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D059630:Mesenchymal Stem Cells / Q000187:drug effects; D053758:Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D013499:Surface Properties; D023822:Tissue Engineering; D014025:Titanium / Q000737:chemistry*; D000069453:Ultrasonic Waves
chemical_list: D000497:Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium
keywords: Biocompatibility; Cell culture; Surface amorphization; Ultrasonic Nano-crystal Surface Modification (UNSM); Wear resistance