The Recarceh on the Structure, Magentism and Martinstitic Transformation of the Ni-Based Ferromagnetic Shap memory Alloys
|School||Hebei University of Technology|
|Course||Materials Physics and Chemistry|
|Keywords||Ferromagnetic shape memory alloys Martensitic transformation Magnetic Heusler structure γ phase|
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 sub > of Fe x sub > Mn 37 < / sub > the Sb 12 sub > 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 sub > alloy ac susceptibility testing seems to observe in the middle of horse the Golgi phase transition behavior. For Ni 51 - x sub > Fe x sub > Mn 37 < / sub > Sb 12 sub > 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 sub > Mn 37 < / sub > the Sb 12 - x sub > the Fe x sub > , Fe part replaced Sb alloy martensitic transformation temperature with increasing substitution increased Ni 51 sub > Mn 37 < / sub> Sb 11 sub > 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 .