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Formation of the Nanocrystalline Structure in an Equiatomic NiTi Shape-Memory Alloy by Thermomechanical Processing

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Abstract

The microstructural evolution during cold rolling followed by annealing of an equiatomic NiTi shape-memory alloy was investigated. The high purity Ni50Ti50 alloy was cast by a copper boat vacuum induction-melting technique. The as-cast ingots were then homogenized, hot rolled, and annealed to prepare the suitable initial microstructure. Thereafter, annealed specimens were cold rolled up to 70 % thickness reduction at room temperature. Post-deformation annealing was conducted at 400 °C for 1 h. The microstructure was characterized using scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and differential scanning calorimetry techniques. The initial microstructure was free from segregation and Ti- or Ni-rich precipitates and was composed of coarse grains with an average size of 50 μm. The cold rolling of NiTi alloy resulted in a partial amorphization and the deformation-induced grain refinement. A nanocrystalline structure with the grain size of about 20-70 nm was formed during the post-deformation annealing.

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Acknowledgments

The authors would like to sincerely acknowledge the financial support of Iran National Science Foundation (Contact No. 89001410).

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, 84156-83111, Isfahan, Iran

    E. Mohammad Sharifi, A. Kermanpur, F. Karimzadeh & A. Esmaili

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  1. E. Mohammad Sharifi
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  2. A. Kermanpur
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  4. A. Esmaili
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Correspondence to E. Mohammad Sharifi.

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Mohammad Sharifi, E., Kermanpur, A., Karimzadeh, F. et al. Formation of the Nanocrystalline Structure in an Equiatomic NiTi Shape-Memory Alloy by Thermomechanical Processing. J. of Materi Eng and Perform 23, 1408–1414 (2014). https://doi.org/10.1007/s11665-013-0856-9

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  • DOI: https://doi.org/10.1007/s11665-013-0856-9

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