Microstructure, mechanical and superelastic behaviors in Ni-free Ti-Zr-Nb-Sn shape memory alloy fibers prepared by rapid solidification processing
- Li, Shuanglei; Kim, Yeon-wook; Choi, Mi-seon; Nam, Tae-hyun
- Issue Date
- ELSEVIER SCIENCE SA
- Ti-Zr-Nb-Sn alloy; Shape memory alloy; Rapid solidification; Superelasticity; Mechanical properties
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.782
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Ni-free Ti-based shape memory alloy with superior superelasticity is promising and attractive for biomedical applications. In this study, Ti-18Zr-12.5Nb-2Sn (at.%) alloy fibers were prepared by rapid solidification method and then the effect of various heat treatments on phase constitutions, microstructures, mechanical properties, and superelasticity was investigated by means of X-ray diffraction (XRD), optical microscope (OM), transmission electron microscope (TEM) and tensile test. a phase was observed in the 673 K and 773 K annealed alloy fibers, leading to the degraded ductility. The total recovery strain at room temperature decreased, grain size and transformation temperature increased with increasing annealing temperature from 873 K to 1173 K. Athermal omega was observed in the 1173 K annealed alloy fibers. A good combination of clear superelasticity and high yield stress was achieved by annealing at 873 K followed by aging at 573 K due to the combined effect of the age-hardening caused by isothermal omega phase and small grain size, which indicates these alloy fibers have a good potential in biomedical applications.
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- 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
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