用标准单辊甩带技术在大气环境下制备Fe73.5Si13.5-xGexB9Cu1Nb3(x=3,6)非晶条带,分别在470℃、510℃、550℃和590℃对非晶条带进行真空等温退火1h后,在非晶基体中形成了纳米晶相.用X射线衍射(XRD),透射电镜(TEM)和差示扫描量热法(DSC)测量研究了快淬态和热处理后样品的结构和结晶动力学.基于差热分析的数据,使用Kissinger,Ozawa和Augis-Bennett模型计算了非晶条带的结晶激活能,利用Johnson-Mehl-Avrami(JMA)方程计算了非晶条带初始结晶的局域Avrami因子n.局域Avrami因子n随晶化体积分数α的显著变化说明,非晶条带非等温初始结晶的机理在不同的晶化阶段是不同的.晶化初期的机理是扩散控制的三维形核和晶粒生长的整体晶化,形核速率逐渐减小;晶化中后期为一维形核和生长的表面晶化过程,形核速率近似为零.基于XRD和TEM测量结果,分别在510℃、550℃和590℃真空等温退火1h后,在Fe735Si13.5-xGexB9Cu1Nb3(x=3,6)非晶条带中析出的α-Fe (Si,Ge)相的平均晶粒尺寸D小于15nm.
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