|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||K-68: Effect of Martensite Reorientation Deformation on the Evolutions of Crystallographic Textures and Lattice Strains of NiTi Wire
||Xiangguang Kong, Shijie Hao, Hong Yang, Zhen Sun, Yinong Liu, Yang Ren, Changfeng Chen, Lishan Cui
|On-Site Speaker (Planned)
The effect of martensite variant reorientation deformation on the crystallographic textures and lattice strains of a NiTi wire was studied by means of in situ high-energy X-ray diffraction during tensile deformation. The NiTi wire was found to have four axial fiber textures along the wire axial direction in its thermally formed self-accommodating B19' martensite, the reorientation deformation converted the (103) axial texture into (-103) and the (120) texture into (-102). At the meantime, the lattice strains of the favored variants by the tensile load increased and those of the unfavored variants decreased, even at the constant stress over the Lüders deformation stress plateau. The selection of the preferred textures upon deformation is explained on the basis of differences in lattice d-spacing and the changes of the lattice strains are attributed to the removal of the inter-variant coupling and inter-granular constraints caused by the deformation.