Abstract:X-ray diffraction and DSC were used to investigate the crystallization behavior of amorphous Al₉₀Ni₅Ce₅ alloys at different quenching temperatures. All the amorphous Al₉₀Ni₅Ce₅ alloys quenched at different temperatures crystallize by two stages. The first stage corresponds to FCC Al phase precipitating from the amorphous matrix. The crystallization onset temperature increases with increasing quenching temperature. The quenching temperature also influences the isothermal behaviors. At low quenching temperatures, the FCC Al precipitation is only through grain growth. At high quenching temperatures, the FCC Al precipitation is through growth of quenched-in Al nuclei and nucleation and growth of new crystallites. The reason that the crystallization onset temperature varies with quenching temperature is likely as that the quenched-in Al nuclei decreases with increasing temperature.

Key words:  amorphous alloy; quenching condition; crystallization