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OALib Journal期刊
ISSN: 2333-9721
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fe73.5si13.5-xgexb9cu1nb3(x=3,6)非晶合金的结晶动力学*
Keywords: 材料科学基础学科,fe73.5si13.5-xgexb9cu1nb3,结构,结晶动力学
Abstract:
？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fe73.5si13.5-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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