Uniaxial tensile deformation behavior of a sandwich-like structural TiNb-NiTi composite for biomedical applications

• 作者: Shun Guo Wei Wang Bao-Guo Shen Li Tan Hai-Xia Liu Wen Ma Zhong-Min Xie Xiao-Nong Cheng Ping Shi
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（12）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 3627-3634
• 页数: 8页
• 语种: 英文

摘要

The uniaxial tensile deformation behavior of a sandwich-like structural TiNb-NiTi composite was inves-tigated by uniaxial tensile test and in situ high-energy synchrotron X-ray diffraction (SXRD).It is found that below 1.2％ macroscopic strains,the elastic deformations of the B2,β,B19'and α" phases take place in the TiNb-NiTi composite.During the subsequent loading,the β → α" and B2 → B19'stress-induced martensitic trans-formations (SIMTs) occur within the macroscopic strains of 0.5％-4.2％ and the macroscopic strains of 0.7％-6.2％,respectively.At the macroscopic strain of about 4.2％,the outer TiNb layer of the TiNb-NiTi composite experiences a partial fracture,as proved by the disappearance of (040)α"and a sudden jump in the (110)B19'd-spacing caused by load transfer.With further uniaxial tensile deformation,the TiNb-NiTi composite finally fractures at a strain of ～ 6.2％.Our results might provide some valuable information for under-standing the deformation behavior of novel sandwich-like structural shape memory composites in more depth.