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张明,张欣,刘庆锁.Ni-Mn-Ga-V高温形状记忆合金研究[J].稀有金属材料与工程(英文),2019,48(9):2794~2798.[Ming Zhang,Xin Zhang and Qingsuo Liu.Study of Ni-Mn-Ga-V high-temperature shape memory alloys[J].Rare Metal Materials and Engineering,2019,48(9):2794~2798.]
Study of Ni-Mn-Ga-V high-temperature shape memory alloys
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Received:March 06, 2018  Revised:April 03, 2018
Key words: High-temperature shape memory alloys  Ni-Mn-Ga alloys  Shape memory effect  Martensitic transformation
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Ming Zhang,Xin Zhang and Qingsuo Liu  
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      In this paper, the effect of V elememt addition on the properties of a (Ni56Mn25Ga19)100-xVx (x = 0, 1, 3) (at.%) high-temperature shape memory alloys was investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and compression test. The results show that the microstructure and some properties of our alloys are very different from that of the reported Ni56Mn25Ga19-xVx alloy due to the V substitution method difference. Single phase of non-modulated martensite with tetragonal structure is observed for the undoped alloy, and dual-phase structure which is consisted of tetragonal martensite and bamboo leaf shaped γ phase is present for x=1 and 3. With increasing V content, the amount of γ phase increases, while the size and shape of γ phase keep unchanged. V addition enhances the mechanical properties and shape memory effect. The reversible strain of 6.7% is obtained in the (Ni56Mn25Ga19)99V1 alloy under pre-strain of 10% after heating.