Microstructures of Ti–Ni–Fe wire after severe cold-drawing and annealing |
| |
作者姓名: | Hui-Fang Geng Fu-Shun Liu |
| |
作者单位: | School of Material Science and Engineering,Beijing University of Aeronautics and Astronatics |
| |
基金项目: | supported by the National Natural Science Foundation of China (No. 50921003);Industry, Education and Research Projects of the China Aviation Industrial (No.cxy2012BH04) |
| |
摘 要: | The microstructures and mechanical properties of Ti–47 at%Ni–3 at%Fe shape memory alloy wire under the condition of severe cold-drawing at room temperature and different postdeformation annealing processes were intensively investigated using transmission electron microscope(TEM),X-ray diffraction(XRD),Vickers microhardness tester and electron tensile tester.It is indicated that the structure of the alloy evolves into a predominant amorphous structure with a trace of nanocrystalline B2 phase after the cold-drawing of 76%areal reduction.Postdeformation annealing process exerted significant influence on the microstructure and mechanical properties.Crystallization occurs when the cold-drawn wire was annealed at 300℃ for 30 min.The ultimate tensile strength and ductility as well as the superelasticity of the wire are improved significantly by cold-drawing plus postdeformation annealing.
|
关 键 词: | Ti–Ni–Fe wire Severe plastic deformation Cold-drawing Annealing Amorphous structure |
本文献已被 维普 SpringerLink 等数据库收录! |