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材料工程  2008 

FeCoNbSiBCu大块非晶合金的热稳定性与晶化过程研究

Keywords: 大块非晶,热稳定性,晶化,晶粒尺寸

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Abstract:

用差示扫描量热分析和原位高温X射线衍射研究了(Fe36Co36Nb4Si4.8B19.2)100-xCux(x=0,0.5,0.6,0.7)大块非晶合金的热稳定性及其晶化过程。结果表明,微量Cu显著改变了Fe36Co36Nb4Si4.8B19.2大块非晶合金的晶化过程,无铜合金表现出单一尖锐晶化峰,而含铜量原子分数为0.5%,0.6%和0.7%的晶化过程分为四个阶段,Cu的加入提高了非晶合金纳米析出相的热稳定性。原位X射线衍射研究表明,FeCoNbSiBCu大块非晶合金初始晶化相为bcc-FeCo并于930K转变为bcc-Co7Fe3相。Cu添加后bcc-Co7Fe3的晶化表观激活能由460.41kJ/mol升高至545.69kJ/mol。用谢乐公式计算样品在840K保温17.5min的平均晶粒尺寸为22.3nm。

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