Microstructure and Mechanical Behaviors of Electron Beam Welded Ti44Ni47Nb9 Shape Memory Alloys

  • Dan Yang
  • Haichang Jiang
  • Mingjiu Zhao
  • Lijian Rong
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The microstructure, martensitic transformation behavior and mechanical properties of the Ti44Ni47Nb9 electron beam welding joints were systemically studied in this research. The results showed that the microstructure of the fusion zone was composed of equiaxed grains with a small quantity of eutectic structure around the grain boundaries, and the grain size in the fusion zone was smaller than that in the as-cast microstructure. The ultimate tensile strength was a little lower than that of the base. The dissolution of niobium in the matrix obstructed the martensite transformation and decreased the martensite start temperature (Ms). After being deformed at the low temperature, the welding joints exhibited good wide transformation hysteresis, which was similar to that of the base metal.

Keywords

Ti44Ni47Nb9 shape memory alloys Electron beam welding Martensitic transformation 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support for this research provided by the National Natural Science Foundation of China (Grant No. 51001100).

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Dan Yang
    • 1
  • Haichang Jiang
    • 1
  • Mingjiu Zhao
    • 1
  • Lijian Rong
    • 1
  1. 1.Division of Materials for Special EnvironmentsInstitute of Metal Research, Chinese Academy of SciencesShenyangChina

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