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<p>Shape memory alloys (SMAs) are a new type of smart material with various compositions, including Fe-based, Cu-based, and Ni–Ti (NiTi) alloys. NiTi, commonly known as Nitinol, is the most widely used SMA due to its outstanding properties, such as excellent workability, biocompatibility, corrosion resistance, shape memory, and pseudoelasticity. Addition of Cu to NiTi enhances its mechanical and functional characteristics, including pseudoelasticity and shape memory effect. This study investigates the properties of NiTiCu alloys produced through vacuum induction melting and cast using a MgO crucible. The resulting specimens were analyzed using various techniques, including optical microscopy, Vicker hardness testing, X-ray diffraction, and differential scanning calorimetry. The analysis revealed a microhardness range of 372–395 Hv with a standard deviation of 7.92. The identified phases included NiTiCu, CuTi, and NiTi<sub>2</sub>. This study found that NiTiCu exhibits a lower thermal hysteresis of 21.91 °C compared with pure NiTi.</p>

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Fabrication and characterization of vacuum induction-melted cast NiTiCu shape memory alloy

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Hari Om,
  • Shankar Singh

摘要

Shape memory alloys (SMAs) are a new type of smart material with various compositions, including Fe-based, Cu-based, and Ni–Ti (NiTi) alloys. NiTi, commonly known as Nitinol, is the most widely used SMA due to its outstanding properties, such as excellent workability, biocompatibility, corrosion resistance, shape memory, and pseudoelasticity. Addition of Cu to NiTi enhances its mechanical and functional characteristics, including pseudoelasticity and shape memory effect. This study investigates the properties of NiTiCu alloys produced through vacuum induction melting and cast using a MgO crucible. The resulting specimens were analyzed using various techniques, including optical microscopy, Vicker hardness testing, X-ray diffraction, and differential scanning calorimetry. The analysis revealed a microhardness range of 372–395 Hv with a standard deviation of 7.92. The identified phases included NiTiCu, CuTi, and NiTi2. This study found that NiTiCu exhibits a lower thermal hysteresis of 21.91 °C compared with pure NiTi.