Design of NiMnGaFe alloys with high-temperature superelasticity
Timofeeva E.E.1, Panchenko E.Yu.1, Dmitrienko M.C.1, Yanushonite E.I.1, Fatkullin I.D.1, Chumlyakov Y.I.1
1Tomsk State University, Tomsk, Russia
Email: timofeeva_katie@mail.ru
The effect of chemical composition on the microstructure, high-temperature superelasticity and strength properties of martensite has been studied on the Ni2MnGa-Fe polycrystals. The Ni52Mn17Ga21Fe10 and Ni56Mn9Ga19Fe16 (at.%) alloys contain a large amount of the γ-phase (25 to 60 %) which prevents the superelasticity. High-temperature superelasticity in compression was found in the Ni56Mn10Ga25Fe9 polycrystals free of the γ-phase. Transition from polycrystals to single crystals (with close composition of Ni54Mn12Ga25Fe9) results in a significant increase in the martensite strength properties (from 720 to 1450 MPa) due to selecting the compression axis along the high-strength [001]-direction with maintaining the plasticity of 19 % and high-temperature superelasticity. Keywords: Heusler alloys, martensitic transformation, high-temperature superelasticity, NiMnGaFe, single crystals, γ-phase.
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