Amorphous ribbons of(Ni_(0.75)Fe_(0.25))_(78-x)Nb_xSi_(10)B_(12)(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_(0.75)Fe_(0.25))_(78)Si_(10)B_(12) 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,Fe_2Si,Ni_2Si and Fe_3B after
annealing at 765K.(Ni_(0.75)Fe_(0.25))_(73)Nb_5Si_(10)B_(12) 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) B_6,Ni_(31)Si_(12) and Nb_2NiB_(0.16).
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