In situ synchrotron X-ray diffraction analysis of deformation behavior of a Nb/NiTi composite for biomedical application
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ORIGINAL ARTICLE
In situ synchrotron X-ray diffraction analysis of deformation behavior of a Nb/NiTi composite for biomedical applications Shun Guo* , Rui-Tang Wu, Yu-Lu Shi, Yan-Pin Hou, Wen Ma, Guang-Lei Liu, Hai-Xia Liu* , Xiao-Nong Cheng
Received: 10 June 2020 / Revised: 13 August 2020 / Accepted: 29 September 2020 Ó GRINM Bohan (Beijing) Publishing Co., Ltd 2020
Abstract The deformation behavior involved in Nb/NiTi composite for biomedical applications within a large macroscopic strain range was investigated by tensile loading–unloading test and in situ synchrotron X-ray diffraction (SXRD). Experimental results show that during loading, the Nb/NiTi composite experiences the elastic elongation of B2-NiTi austenitic, B190 -NiTi martensitic and b-Nb phases, B2 ? B190 stress-induced martensitic (SIM) transformation and tensile plastic deformation of bNb phase. During unloading, the deformation behavior involved in Nb/NiTi composite includes the elastic recovery of B2-NiTi austenitic, B190 -NiTi martensitic and b-Nb phases, reverse phase transformation B190 ? B2 and compressive deformation of b-Nb phase. The martensitic transformation in this composite is almost reversible and occurs in a localized manner. These results might contribute to a comprehensive understanding of the deformation mechanism involved in Nb/NiTi composite and shed some light on design and development of novel composites with a combination of good biocompatibility and excellent superelasticity for biomedical applications. Keywords Nb/NiTi composite; Deformation behavior; Superelasticity; Localized martensitic transformation S. Guo*, R.-T. Wu, Y.-L. Shi, Y.-P. Hou, W. Ma, G.-L. Liu, H.-X. Liu*, X.-N. Cheng School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China e-mail: [email protected] H.-X. Liu e-mail: [email protected] W. Ma Youke Publishing Co., Ltd., GRINM Group Co., Ltd., Beijing 100088, China
1 Introduction NiTi-based shape memory alloys (SMAs) are of interest to the biomedical applications for potential use in biomedical devices, such as guide wires, stents and dental arch wires, due to their good shape memory effect and superelasticity and high corrosion resistance [1–4]. However, many studies have reported that the Ni ions are not biocompatible, which may lead to sensitization and even carcinogenesis when they release into human cells and tissues [5, 6]. Therefore, much effort has been made to design and develop Ni-free b-type Ti-based (b-Ti) SMAs with better biocompatibility in order to avoid the adverse reactions caused by the toxic Ni ions releasing from NiTi-based SMAs [7–10]. Currently, although the b-Ti SMAs have been widely investigated [11–14], they still cannot replace NiTi-based SMAs. This is because the b-Ti SMAs possess lower critical stress for inducing martensitic transformation (rSIM, * 300 MPa) and smaller recoverable strain (e, * 2.5%) than those (* 550 MPa and * 10%, respectively) of NiTi-based SMAs [1, 7, 15–17]. In fact, the differences of superelastic property betwe
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