【摘要】 采用旋铸急冷工艺在大气环境中制备出(Ni0.75Fe0.25)78-xNbxSi10B12(x=0,5)非晶合金带材。X射线衍射(XRD)分析表明样品为完全非晶态。用差热分析仪(DTA)在高纯氩气保护下测量了非晶薄带的Tg、Tx、Tm,并分析了其热稳定性。根据DTA结果分析表明,(Ni0.75Fe0.25)78Si10B12非晶合金退火温度为695,715,745和765K,在715和745K退火时,非晶基体上析出了单一的-(γFe,Ni)固溶体,平均晶粒尺寸分别约为10.3和18.5nm;765K退火后的结晶相为-γ(Fe,Ni)固溶体,Fe2Si,Ni2Si和Fe3B。(Ni0.75Fe0.25)73Nb5Si10B12非晶合金的退火温度为720,750和800K,退火后不能在非晶基体上析出单一的晶化相,晶化析出相为-γ(Fe,Ni)固溶体,(Fe,Ni)23B6,Ni31Si12和Nb2NiB0.16。更多还原

【Abstract】 Amorphous ribbons of(Ni_0.75Fe_0.25)_78-xNb_xSi₁₀B₁₂（x=0,5） were prepared by a single roller melt-spinning technique in atmosphere.XRD analysis indicates that the specimens are fully amorphous.The thermal stability of the amorphous alloys was studied by using the differential thermal analysis（DTA） in argon atmosphere,and the glass transition temperature（T_g）,crystallization temperature（T_x）,melting point temperature（T_m） were measured.The annealed temperatures were determined in terms of DTA patterns.(Ni_0.75Fe_0.25)₇₈Si₁₀B₁₂ amorphous alloy was annealed at different temperatures: 695,715,745 and 765K,respectively.The results show that the specimen annealed at the temperatures 715 and 745K,a single phase of γ-（Fe,Ni） solid solution with grain size of about 10.3 and 18.5 nm respectively precipitates in the amorphous matrix;the crystallized phases are γ-（Fe,Ni） solid solution,Fe₂Si,Ni₂Si and Fe₃B after annealing at 765K.(Ni_0.75Fe_0.25)₇₃Nb₅Si₁₀B₁₂ amorphous alloy was annealed at different temperatures: 720, 750 and 800K,respectively.No single phase precipitates in the amorphous matrix after annealing treatment,the crystallized phases are γ-（Fe,Ni） solid solution,（Fe,Ni）₂₃ B₆,Ni₃₁Si₁₂ and Nb₂NiB_0.16.更多还原