| Formability, thermal stability, electrical resistance and mechanical properties of amorphous Al_(86)Ni_(10-x)M_xLn₂ (M=transition metal, Ln=rare-earth metal, 0≤X≤10 at%) alloys were investigated. The effect of additional elements on the formability of amorphous phase was decreased in sequence of (Fe, Co)>(Mn, Cu, Zr)>(Ti, Cr, Nb), indicating the effectiveness of the attractive bonding nature between Al or Ce and M The crystallization temperature(T_x) and room-temperature electrical resistance(ρ_(R. T.)) of Al_(88)Ni_(10-x)M_xCe₂ amorphous alloys increased linearly with Fe of Co content but decreased for other ones. The high tensile fracture strengths above l000㎫ obtained in most of Al_(88)Ni_(10-x)M_xLn₂ amorphous alloys. The maxima of the σ₁ in Al_(88)Ni_(10-x)(Fe, Co)_xLn₂ amorphous alloys were obtained at X=5%, e.g., 1420㎫ for Al_(88)Ni_5Fe_5Nd₂ alloy. The high tensile strength and thermal stabilities in a wide compositional range are thought to result from the combination effect of alloying elements which has a large negative interaction(i.e., a large negative mixing enthalpy) with Al or Ce. |
|
