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<p>In this study, the microstructure, crystal structure, martensitic transformation, and shape memory effect of Cu-18.5Zn-14Sn-2.5Fe (wt.%) single crystal were investigated. The single crystal was obtained solely through direct annealing of a corresponding cast alloy. It comprises three distinct phases: a leaf-type phase corresponding to the α-Cu(Zn, Sn) phase, randomly distributed nanoprecipitates composed of α-Fe, and a β(CuSn) phase as the matrix. The martensitic transformation starting temperature (<i>M</i><sub>s</sub>) for this alloy is 233&#xa0;K. Compression tests reveal that the single crystal exhibits a complete shape memory effect for deformations below 7%.</p>

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Microstructure and Shape Memory Properties of Bulk Cu-Zn-Sn-Fe Single Crystals

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Lipeng Guo,
  • Mingpei Li,
  • Feng Chen,
  • Jiahe Mei,
  • Laisen Wang,
  • Cuiping Wang,
  • Shuiyuan Yang

摘要

In this study, the microstructure, crystal structure, martensitic transformation, and shape memory effect of Cu-18.5Zn-14Sn-2.5Fe (wt.%) single crystal were investigated. The single crystal was obtained solely through direct annealing of a corresponding cast alloy. It comprises three distinct phases: a leaf-type phase corresponding to the α-Cu(Zn, Sn) phase, randomly distributed nanoprecipitates composed of α-Fe, and a β(CuSn) phase as the matrix. The martensitic transformation starting temperature (Ms) for this alloy is 233 K. Compression tests reveal that the single crystal exhibits a complete shape memory effect for deformations below 7%.