Achieving a combination of decent biocompatibility and large near-linear-elastic deformation behavior in shell-core-like structural TiNb/NiTi composite. (November 2021)

• Record Type: Journal Article
• Authors: Guo, Shun; Wu, Tinghui; Kwak, Minkyung; Lu, Weiqun; Ma, Wen; Liu, Qing; Liu, Haixia; Meng, Qingkun; Liu, Guanglei; Cheng, Xiaonong; Zhao, Xinqing
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 123(2021)
• Publication Date: 2021-11
• Subjects: TiNb/NiTi composite -- Tensile deformation behavior -- Stress-induced martensitic transformation -- Large elastic deformability; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2021.104789
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: As expected from the material design, a novel shell-core-like structural TiNb/NiTi composite possessing both decent biocompatibility and large near-linear-elastic deformation behavior (namely as near-linear elasticity accompanied by high elastic strain limit) was prepared successfully by a hot pack-rolling combined with cold rolling procedure. Non-cytotoxic TiNb outer shell obstructs the NiTi inner core from cells and provides the decent biocompatibility of TiNb/NiTi composite. Large near-linear-elastic deformation behavior for this TiNb/NiTi composite has been confirmed to be associated with intrinsic elastic deformation, two types of reversible stress-induced martensitic transformations (i.e. β↔α'' and B2↔B19′ transformations) occurring in a homogeneous manner, together with the (001) compound twin in B19′ martensitic plates. Our study provides a new design approach for developing NiTi-based composites with both decent biocompatibility and large near-linear-elastic deformation behavior for biomedical or engineering applications. Graphical abstract: Image 1 Highlights: A novel shell-core-like structural TiNb/NiTi composite was designed. It possesses decent biocompatibility and large near-linear elasticity. The intrinsic reasons for the large near-linear elasticity were clarified.