Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (2): 243-248.DOI: 10.1007/s40195-014-0190-8

• Orginal Article • Previous Articles     Next Articles

Martensitic Transformation and Its Thermal Cycling Stability in Ni56Mn21Cu4Ga19 High-Temperature Shape Memory Ribbon

Xi-Li Lu1, De-Xi Su1, Feng Chen1(), Wei-Li Liu1, Yang-Guang Shi2, Yun-Xiang Tong1, Li Li1   

  1. 1. Center for Biomedical Materials and Engineering, Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin, 150001, China
    2. Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
  • Received:2014-06-17 Revised:2014-09-04 Online:2015-02-10 Published:2015-07-23

Abstract:

The microstructure, martensitic transformation, and thermal cycling stability of Ni56Mn21Cu4Ga19 high-temperature shape memory ribbons subjected to different annealing conditions were investigated and compared with that of the bulk master alloy. It was shown that γ phases precipitated in the bulk and the ribbons annealed for 5 h at 800 and 900 °C, which lead to the same poor thermal cycling stability. However, the formation of γ phase was inhibited in the ribbons annealed at 700 °C for 30 min and 5 h, which remarkably improved the thermal cycling stability and also shifted the martensitic transformation to a lower temperature with a drop of about 60 °C than other three samples.

Key words: Ni-Mn-Cu-Ga, Annealing, Melt spinning, Martensitic transformation, Shape memory alloy