Effect Of Alloy Elements On GFA,Thermal Stability And Magnetic Performances Of Fe-based Amorphous Alloys

As novel material, Fe-based amorphous alloys have attracted attention of people more and more, owing to its' excellent physical,chemical,mechanical performance.Fe-based amorphous ribbons and bulk amorphous alloys were prepared by spin quenching and copper mold casting respectively in this paper. Alloy elements, such as C,Y,Sn,Co, were added into Fe-based alloys with proper quantities, and the effect-s on glass-forming ability (GFA),thermal stability and magnetic performance of Fe-based amorphous alloys were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and vibrating sample magnetometer(VSM).Research work showed: addition of element C(less than or equal to 7.75%) was helpful to alloys' GFA, the melting point of alloy fell down accompany with addition of C,ΔT_x,T_rg,γincreased with different extent, which illustrated that GFA of alloys intensified. When element Y added into primitive component (Fe₆₈Ni₁Al₅Ga₂P_9.65C_6.75B_4.6Si₃), three kinds component of alloys were all amorphous alloys tested by X-ray diffraction (XRD), D-value between first crystallied peak T_p1 and second crystallied peak T_p2 decreased accompany with addition of Y analysed by differential scanning calorimeter (DSC). The brittleness of alloys enchanced gradually in cast condition with the increasement of Sn, when content of Sn reached 2.5% (at%), The brittleness of alloys got maximum.ΔT_x,T_rg,γenchanced with the increasement of content Sn, which denoted GFA of alloys intensified gradually. The addition of Co was favourable to improvement of alloys'toughness, when content of Co reached 9% (at%), alloys had best roughness, when content of Co varied between 0 and 5%,ΔT_x decreased gradually, melting point of alloys arised, parameterγhad no alteration. However, when content of Co changed between 5% and 9%, value ofγarised gradually, especially in 7%～9%,γhad maximal elevated amplitude. Among prepared amorphous thin strip, selected some alloys which had larger value ofγ, bulk amorphous alloys (0.5mm) were prepared successfully by copper mold casting, this also demonstrated that as parameter of appraised GFA, value ofγwas credible. Alloy had better Soft magnetism performance when content of Y reached 0.5%. Saturation magnetization and Coercive force had no obvious change along with change of Co.