| The effect of addition of boron on the anneal-induced enthalpy relaxation, the change in Curie temperature(T_c) and the atomic parking density for metal-metal type Fe-(Ni, Co)-Zr amorphous alloys has been investigated. As boron content increased, the magnitude of enthalpy relaxation, which was evaluated with that of endothermic reaction, increased for (Fe_(0.5)Co_(0.5))_(90)Zr_(10-x)B_x(x=0-3) and (Fe_(0.85)Ni_(0.15))_(90-x)Zr_(10)B_x(x=0.4) amorphous alloys. Moreover, the atomic packing density decreased with increasing boron content for (Fe_(0.5)Co_(0.5))_(90)Zr_(10-x)B_x alloys. The large enthalpy relaxation for boron -auditioned alloys was ascribed to the low atomic packing density. Additionally we concluded that the structure of the metal-metal type amorphous alloys is comparative1y stab1e against the low∼temperature enthalpy retaxation because of their high atomic packing. The annealing response of T for (Fe_(0.85)Ni_(0.15))_(90-x)Zr_(10)B_x alloys suggested that boron stabilizes the topological structure of the metal-metal type amorphous alloys. |
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