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Columnar-grained Cu 71.7 Al 18.1 Mn 10.2 shape memory alloy (SMA) was prepared by a directional solidification method and exhibited a high superelasticity of 8.18% and excellent ductility at room temperature, which provided the possibility of obtaining high shape memory. However, proper pre-deformation is an essential part of repeatedly obtaining large and stable shape change. In this paper, one-time uniaxial tensile pre-deformation was carried out at the temperature range -70⁻-80 °C. Then, the two-way shape memory effect (TWSME) of the alloy was evaluated by the martensitic transformation strain ( ε  M ) which was measured by a thermal expansion test to investigate the relationship between the pre-deformation strain ( ε  T ) and the TWSME. The results showed that ε  M of the columnar-grained Cu 71.7 Al 18.1 Mn 10.2 alloy increased at first and then decreased with the increase of ε  T . The maximum value 2.91% of the ε  M could be reached when ε  T was 6%. The effects of the ε  T on transformation temperatures were also measured by differential scanning calorimetry. Based on the variations of transformation temperatures, the relationship between the internal stress induced by the pre-deformation process and the ε  M , and the influence mechanism of the pre-deformation strain on the TWSME in columnar-grained Cu 71.7 Al 18.1 Mn 10.2 alloy, were discussed. The results obtained from this work may provide reference for potential applications of Cu-based SMAs, such as self-control components, fasteners, etc.

Two-Way Shape Memory Effect Induced by Tensile Deformation in Columnar-Grained Cu71.7Al18.1Mn10.2 Alloy