【摘要】 以不同加热速率下的DSC曲线数据为基础,利用Kissinger及Deloy激活能计算方法研究了Mm55Al25Cu10Ni5Co5与La55Al25Cu10Ni5Co5大块非晶合金的非等温晶化动力学。结果表明:两非晶合金的玻璃转变温度(Tg)、晶化初始温度(Tx)和晶化峰值温度(Tp)都随着加热速率的增加而增加,具有明显的动力学效应;阶段激活能随晶化体积分数的增加,先迅速增加,达到最大值后缓慢下降,为典型的形核及长大机制且形核瞬间完成,晶化以生长为主。Mm55Al25Cu10Ni5Co5非晶合金的玻璃转变激活能、形核激活能和长大激活能以及晶化初期激活能和最大激活能都相应大于La55Al25Cu10Ni5Co5表明前者比后者具有更高的热稳定性。更多还原

【Abstract】 Based on the datum measured from continuous heating differential scanning calorimetry,the crystallization kinetics of Mm55Al25Cu10Ni5Co5 and La55Al25Cu10Ni5Co5 BMGs has been studied by Kissinger’s and Deloy’s method.The results expatiated that the heating rate has a significant influence on glass transition temperature Tg,onset crystallization temperature Tx and peak temperature Tp and caused these temperatures increased as they went up which were of definition of kinetics efficiency.The phase activation energy briefly increases initially as the crystallization volume increases and then slowly decreases after maximum value reached.The mechanism of crystallization was of typical nucleation,its growth dominates crystallization process,being ended transiently.The Kissinger activation energy for Mm55Al25Cu10Ni5Co5 BMG,the initialone and the maximum one were all bigger than those for La55Al25Cu10Ni5Co5,which expatiate the former has higher thermal stability than the latter.更多还原