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Microstructures of Ti–Ni–Fe wire after severe cold-drawing and annealing

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Abstract

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 °C 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.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 50921003) and the Industry, Education and Research Projects of the China Aviation Industrial (No.cxy2012BH04).

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Authors and Affiliations

  1. School of Material Science and Engineering, Beijing University of Aeronautics and Astronatics, Beijing, 100191, China

    Hui-Fang Geng & Fu-Shun Liu

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  1. Hui-Fang Geng
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  2. Fu-Shun Liu
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Correspondence to Fu-Shun Liu.

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Geng, HF., Liu, FS. Microstructures of Ti–Ni–Fe wire after severe cold-drawing and annealing. Rare Met. 32, 550–554 (2013). https://doi.org/10.1007/s12598-013-0091-4

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  • DOI: https://doi.org/10.1007/s12598-013-0091-4

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