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<p>This study investigated the effect of annealing on the microstructure, mechanical properties, and thermal properties of Ti<sub>51.25</sub>Ni<sub>41.25</sub>Nb<sub>7.5</sub> ternary nitinol alloy manufactured using the laser direct metal deposition (LDMD) technique. The mechanically pre-alloyed powder consisting of the composition of Ti<sub>52.5</sub>Ni<sub>42.5</sub>Nb<sub>7.5</sub> was used as a feedstock to manufacture cubic samples on a Ti6Al4V base plate. The manufactured samples were subjected to post-heat treatment at temperatures of 700&#xa0;°C and 900&#xa0;°C. The produced samples were then characterized using scanning electron microscope (SEM), Vickers hardness, nano-indentation, Differential Scanning Calorimeter (DSC), and X-ray diffraction (XRD). SEM micrographs of both annealed samples showed dissolution of the eutectic phase that was present in the as-built sample into the matrix as β-Nb phase, which resulted in the annealed samples having increased hysteresis. The Ni<sub>3</sub>Ti peaks’ prominence increased with annealing temperature, leading to an increase in hardness.</p> Graphical abstract <p></p>

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Effect of post-heat treatment on mechanical, microstructure, and thermal properties of Nitinol (NiTiNb) manufactured using laser direct metal deposition (LDMD) process

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月15日

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  • Samuel Skhosane,
  • Nthabiseng Maledi,
  • Sisa Pityana,
  • Paul Lekoadi,
  • Monnamme Tlotleng

摘要

This study investigated the effect of annealing on the microstructure, mechanical properties, and thermal properties of Ti51.25Ni41.25Nb7.5 ternary nitinol alloy manufactured using the laser direct metal deposition (LDMD) technique. The mechanically pre-alloyed powder consisting of the composition of Ti52.5Ni42.5Nb7.5 was used as a feedstock to manufacture cubic samples on a Ti6Al4V base plate. The manufactured samples were subjected to post-heat treatment at temperatures of 700 °C and 900 °C. The produced samples were then characterized using scanning electron microscope (SEM), Vickers hardness, nano-indentation, Differential Scanning Calorimeter (DSC), and X-ray diffraction (XRD). SEM micrographs of both annealed samples showed dissolution of the eutectic phase that was present in the as-built sample into the matrix as β-Nb phase, which resulted in the annealed samples having increased hysteresis. The Ni3Ti peaks’ prominence increased with annealing temperature, leading to an increase in hardness.

Graphical abstract