Bending springback behavior related to deformation-induced phase transformations in Ti-12Cr and Ti-29Nb-13Ta-4.6Zr alloys for spinal fixation applications

作者：Liu Huihong; Niinomi Mitsuo^*; Nakai Masaaki; Hieda Junko; Cho Ken

来源：Journal of the Mechanical Behavior of Biomedical Materials, 2014, 34: 66-74.

DOI：10.1016/j.jmbbm.2014.01.013

The springback behavior of Ti-12Cr and Ti-29Nb-13Ta-4.6Zr (TNTZ) during deformation by bending was investigated; and the microstructures of the non-deformed and deformed parts of both alloys were systematically examined to clarify the relationship between microstructure and springback behavior.
For the deformed Ti-12Cr alloy, deformation-induced omega-phase transformation occurs in both the areas of compression and tension within the deformed part, which increases the Young's modulus. With the deformed TNTZ alloy, deformation-induced omega-phase transformation is observed in the area of compression within the deformed part; while a deformation-induced alpha '' martensite transformation occurs in the area under tension, which is likely to be associated with the pseudoelasticity of TNTZ. Among these two alloys, Ti-12Cr exhibits a smaller springback and a much greater bending strength when compared with TNTZ; making Ti-12Cr the more advantageous for spinal fixation applications.

• 出版日期2014-6