The goal of this study is investigation of Al base amorphous- nanocrystalline materials in order to improve glass forming ability and thermal stability of these materials. To study the thermal behavior and kinetic of crystallization of produced samples, the X-ray diffraction (XRD), differential thermal analysis (DTA) and high resolution transition electron microscopy (HRTEM) methods, has been used. The theoretical calculations showed that the glass forming ability and thermal stability of Al-Fe alloying system is so high and Ni, Ti and Nb are the best choice for using as alloying elements in this system. The performed mechanical alloying in Al 80 Fe 20 , Al 80 Fe 10 Ni 10 , Al 80 Fe 10 Ti 10 and Al 80 Fe 10 Nb 10 showed that, only in Al 80 Fe 10 Ni 10 and Al 80 Fe 10 Ti 10 alloys amorphous phase can be formed. The produced amorphous phases in these two alloys exhibits one-stage crystallization (at temperature up that 850 o C) on heating and the activation energy for crystallization is about 300 kJ/mol, which is more than other Al- base amorphous alloys. Moreover, the effect of simultaneous presence of Ti and Ni on glass forming ability and thermal stability of amorphous phase in Al 80 Fe 10 Ti 5 Ni 5 alloy was also investigated. The results showed that the thermal stability of amorphous phase in Al 80 Fe 10 Ti 5 Ni 5 alloy is more than Al 80 Fe 10 Ni 10 and Al 80 Fe 10 Ti 10 alloys. The crystallization temperature for Al 80 Fe 10 Ti 5 Ni 5 alloy is about 950 o C which is so higher than other Al-base amorphous alloys (250-400 o C). Keywords: Al-based amorphous alloys; nano- quasicrystalline materials; crystallization kinetic; non-isothermal method.
