Two-Way Shape Memory Effect Induced by Tensile Deformation in Columnar-Grained Cu(71.7)Al(18.1)Mn(10.2) Alloy.-猫眼课题宝

柱状晶Cu71.7Al18.1Mn10.2合金拉伸变形引起的双向形状记忆效应

DOI：

10.3390/ma11112109

发表时间：

2018-10-26

期刊：

Materials (Basel, Switzerland)

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Yao PS;Huang HY;Su YJ;Xie JX

来源链接：

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265934/

采用定向凝固法制备了柱状晶Cu71.7Al18.1Mn10.2形状记忆合金，该合金具有8.18%的超弹性和良好的室温塑性，为获得高形状记忆性能提供了可能。然而，适当的预变形是反复获得大而稳定的形状变化的必要部分。本文在−70-−80 °C温度范围内进行了一次单轴拉伸预变形。通过热膨胀实验测量合金的马氏体相变应变（εM），研究预变形应变（εT）与双向形状记忆效应（TWSME）之间的关系。结果表明，柱状晶Cu71.7Al18.1Mn10.2合金的εM随εT的增大先增大后减小。当εT = 6%时，εM达到最大值2.91%。用差示扫描量热法测定了εT对相变温度的影响。根据相变温度的变化，探讨了预变形过程中产生的内应力与εM的关系，以及预变形应变对柱状晶Cu71.7Al18.1Mn10.2合金TWSME的影响机理。研究结果可为铜基形状记忆合金在自控元件、紧固件等方面的应用提供参考。

Columnar-grained Cu71.7Al18.1Mn10.2 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 (εM) which was measured by a thermal expansion test to investigate the relationship between the pre-deformation strain (εT) and the TWSME. The results showed that εM of the columnar-grained Cu71.7Al18.1Mn10.2 alloy increased at first and then decreased with the increase of εT. The maximum value 2.91% of the εM could be reached when εT was 6%. The effects of the εT 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 εM, and the influence mechanism of the pre-deformation strain on the TWSME in columnar-grained Cu71.7Al18.1Mn10.2 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.