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<p>This paper reports an anisotropic superelasticity and two-way shape memory effect of NiTi fabricated by selective laser melting (SLM). It was found that SLM-fabricated NiTi exhibited a compressive superelasticity of 6.1% parallel to the build direction (BD), compared to only 3.9% perpendicular to BD, following a prestrain of 7.5%. When the compressive prestrain (&lt;7.5%) was applied along BD, the two-way shape memory effect showed an abnormal sample length changes upon cooling/heating events. This abnormal behavior was not present when the prestrain was applied perpendicular to the BD. The maximum shape memory effect of 4.5% and the two-way memory effect of 1.1% was observed in sample when pretrain was applied perpendicular to BD. This unusual shape memory effect is attributed to the anisotropic residual stress distribution in the SLM as-fabricated sample. These findings may have useful implications for optimizing performance and exploring new applications of the strong property anisotropy in SLM-fabricated NiTi.</p>

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Anisotropic Superelasticity and Two-Way Shape Memory Effect in Selective Laser Melting Fabricated NiTi

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Minting Zhong,
  • Zhigang Wu,
  • Jun Deng,
  • Yanliang Du

摘要

This paper reports an anisotropic superelasticity and two-way shape memory effect of NiTi fabricated by selective laser melting (SLM). It was found that SLM-fabricated NiTi exhibited a compressive superelasticity of 6.1% parallel to the build direction (BD), compared to only 3.9% perpendicular to BD, following a prestrain of 7.5%. When the compressive prestrain (<7.5%) was applied along BD, the two-way shape memory effect showed an abnormal sample length changes upon cooling/heating events. This abnormal behavior was not present when the prestrain was applied perpendicular to the BD. The maximum shape memory effect of 4.5% and the two-way memory effect of 1.1% was observed in sample when pretrain was applied perpendicular to BD. This unusual shape memory effect is attributed to the anisotropic residual stress distribution in the SLM as-fabricated sample. These findings may have useful implications for optimizing performance and exploring new applications of the strong property anisotropy in SLM-fabricated NiTi.