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

doi:10.1007/s40195-015-0339-0

Abstract

Abstract:

The influence of annealing temperature on the shape memory effect (SME) and recovery ratio of cold-rolled dual-phase Ni₅₈Mn₂₅Ga_16.9Gd_0.1 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.

Key words: Shape memory alloys, Recrystallization, Cold rolling, Ni-Mn-Ga

Xin Zhang, Qing-Suo Liu, Xian-Shun Zeng, Jie-He Sui, Wei Cai, Ai-Lian Liu. Effect of Annealing Temperature on the Shape Memory Properties of Cold-Rolled Dual-Phase Ni-Mn-Ga-Gd Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(11): 1403-1406.

Figures/Tables 5

Fig. 1 Strain recovery characteristic curves of Ni58Mn25Ga16.9Gd0.1 alloy annealed at 450 °C a and 550 °C b under the pre-strain of 10%. The dotted line represents the recovery strain after heated to 600 °C for 1 min

Table 1 Shape memory behavior (%) of Ni58Mn25Ga16.9Gd0.1 alloy under different states at pre-strain of 10%

Sample	Solution treated [24]	Thermomechanical treatments
Sample	Solution treated [24]	450 °C	550 °C	600 °C
Strain after unloading	6.5	5.5	6.2	6.4
Strain after heating	1.4	2.5	0.2	1.5
SME	5.1	3.0	6.0	4.9
Recovery ratio	86	75	98	85

Fig. 2 XRD patterns of Ni58Mn25Ga16.9Gd0.1 alloy at solution-treated state and after thermomechanical treatments. The inset is the TEM image of solution-treated sample

Fig. 3 TEM images of rolled Ni58Mn25Ga16.9Gd0.1 alloy after 450 °C annealing: a bright field image; b, c magnification images of area A and B in a

Fig. 4 TEM images of rolled Ni58Mn25Ga16.9Gd0.1 alloy after 550 °C annealing: a bright field image; b magnification image of area A in a

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