Acta Metallurgica Sinica (English Letters)

, Volume 28, Issue 11, pp 1403–1406 | Cite as

Effect of Annealing Temperature on the Shape Memory Properties of Cold-Rolled Dual-Phase Ni–Mn–Ga–Gd Alloy

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Abstract

The influence of annealing temperature on the shape memory effect (SME) and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gd0.1 high-temperature shape memory alloy were investigated. The results showed that the SME can be improved by appropriate annealing. SME of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 °C annealing, which were larger than that of the samples annealed at other temperatures. The annealing temperature was in between the recrystallization temperatures of the martensite and γ phase, which leads to the work-hardening state of γ phase kept unchanged during annealing process, and therefore, the critical slip stress of γ phase increased. Thus, the plastic deformation of γ phase reduced during the compression process, and the SME increased.

Keywords

Shape memory alloys Recrystallization Cold rolling Ni–Mn–Ga 
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Notes

Acknowledgments

The study was financially supported by the China Postdoctoral Science Foundation Funded Project (No. 2015M571269). This work was also supported by the Natural Science Foundation of China (Nos. 51271065, 51271069 and 51201062).

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Copyright information

© The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringTianjin University of TechnologyTianjinChina
  2. 2.National Key Laboratory Precision Hot Processing of MetalsHarbin Institute of TechnologyHarbinChina
  3. 3.College of Material Science and EngineeringHeilongjiang University of Science and TechnologyHarbinChina

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