Effects of quenching conditions on crystallization behavior of amorphous Al90 Ni5 Ce5 alloys

摘要

X-ray diffraction and DSC were used to investigate the crystallization behavior of amorphous Al90 Ni5 Ce5alloys at different quenching temperatures. All the amorphous Al90 Ni5Ces alloys quenched at different temperaturescrystallize 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 temperaturealso influences the isothermal behaviors. At low quenching temperatures, the FCC Al precipitation is only throughgrain growth. At high quenching temperatures, the FCC Al precipitation is through growth of quenched-in Al nucleiand nucleation and growth of new crystallites. The reason that the crystallization onset temperature varies withquenching temperature is likely as that the quenched-in Al nuclei decreases with increasing temperature.