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<p>Laser directed energy deposition (DED) is a cutting-edge technique for fabricating NiTi shape memory alloys, known for its precision and capability to produce complex geometries. This study investigates the role of Ni<sub>4</sub>Ti<sub>3</sub> precipitates formed during DED in enhancing the pseudoelasticity and mechanical properties of NiTi alloys. Through tailored DED parameters, we successfully controlled the morphology of Ni<sub>4</sub>Ti<sub>3</sub> precipitates, achieving complete pseudoelastic recovery. Our findings reveal that the presence of Ni<sub>4</sub>Ti<sub>3</sub> precipitates significantly improves the damping capacity and mechanical strength of the alloys, as evidenced by changes in Young’s modulus and hardness. This study examines the effects of laser power on the formation of Ni<sub>4</sub>Ti<sub>3</sub> precipitates in DED-fabricated NiTi alloys and their role in enhancing pseudoelastic recovery. This work provides valuable insights into optimizing DED-fabricated NiTi alloys for superior performance in various applications.</p>

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Ni4Ti3 Precipitates in Directed Energy Deposition-Fabricated NiTi: Pseudoelasticity and Strengthening

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Dongzhe Zhang,
  • Penghui Zhang,
  • Huan Zhao,
  • Yunze Li

摘要

Laser directed energy deposition (DED) is a cutting-edge technique for fabricating NiTi shape memory alloys, known for its precision and capability to produce complex geometries. This study investigates the role of Ni4Ti3 precipitates formed during DED in enhancing the pseudoelasticity and mechanical properties of NiTi alloys. Through tailored DED parameters, we successfully controlled the morphology of Ni4Ti3 precipitates, achieving complete pseudoelastic recovery. Our findings reveal that the presence of Ni4Ti3 precipitates significantly improves the damping capacity and mechanical strength of the alloys, as evidenced by changes in Young’s modulus and hardness. This study examines the effects of laser power on the formation of Ni4Ti3 precipitates in DED-fabricated NiTi alloys and their role in enhancing pseudoelastic recovery. This work provides valuable insights into optimizing DED-fabricated NiTi alloys for superior performance in various applications.