Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Other special nature of the alloy > Shape Memory Alloys

The Recarceh on the Structure, Magentism and Martinstitic Transformation of the Ni-Based Ferromagnetic Shap memory Alloys

Author ZhaoLiQing
Tutor TangChengChun;LiuHeYan
School Hebei University of Technology
Course Materials Physics and Chemistry
Keywords Ferromagnetic shape memory alloys Martensitic transformation Magnetic Heusler structure γ phase
CLC TG139.6
Type Master's thesis
Year 2010
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Ferromagnetic shape memory alloy NiFeGa the NiMnSb basis . Respectively by Cr, Ti and Fe doped to adjust the ferromagnetic shape memory alloy NiFeGa NiMnSb martensitic transformation temperature range , the magnetic properties such . Successfully synthesized by rapid quenching using melt spinning with the L21 structure Ni 2 < / sub > FeGa single-phase ac susceptibility and resistance measurement results show that the martensitic transition temperature at 180K near . Cr and Ti on the Ni 2 FeGa alloy of Fe partial substitution found , the magnetic properties of the alloy decreases substituted increase in the amount of Cr to Fe , and alloys always maintained at room temperature under the conditions of two-phase coexistence . Ti on the partial substitution of Fe, which can effectively inhibit the generation of the γ phase , is conducive to the formation of structure of the L21 . For Ni 51 -x of Fe x Mn 37 < / sub > the Sb 12 Alloy study found that Fe partial substitution of Ni , allows the martensitic transformation temperature is lowered , the Ni 50 < / sub > the FeMn 37 < / sub > Sb 12 alloy ac susceptibility testing seems to observe in the middle of horse the Golgi phase transition behavior. For Ni 51 - x Fe x Mn 37 < / sub > Sb 12 alloys, measurements indicate that the Fe partial substitution of Mn , also lead alloy martensitic phase transition temperature decreases , which is inconsistent with existing laws , affect the martensitic phase transition temperature factors still need to study the issue further . Alloy the Ni 51 Mn 37 < / sub > the Sb 12 - x the Fe x , Fe part replaced Sb alloy martensitic transformation temperature with increasing substitution increased Ni 51 Mn 37 < / sub> Sb 11 Fe alloy martensite phase change temperature reaches about 400K , which laid the experimental foundation for the future development of the high - temperature ferromagnetic shape memory alloy .

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