Microstructure and Mechanical Properties in B-Doped Fe-31.9Ni-9.6Co-4.7Ti Alloys

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Effects of the addition of boron on grain boundary precipitation, martensitic transformation temperatures, and mechanical properties were investigated for Fe-31.9Ni-9.6Co-4.7Ti alloy sheets. Grain boundary precipitation of the η-Ni3Ti phase with the D024 structure, which significantly deteriorates the mechanical properties, is effectively suppressed by the addition of a small amount of B. Both the transformation temperature and the thermal hysteresis slightly increase with increasing B composition. Tensile fracture elongation is improved to be about 1.3 % by addition of 0.05 % B, but no superelastic property was detected in the cyclic stress–strain curve. The features in the mechanical properties are discussed with the texture properties in the sheet specimen.

Original languageEnglish
Pages (from-to)228-234
Number of pages7
JournalShape Memory and Superelasticity
Issue number2
Publication statusPublished - 2016 Jun 1


  • Fe–Ni–Co–Ti
  • Grain boundary precipitation
  • Mechanical behavior
  • Thermoleastic


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