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OALib Journal期刊
ISSN: 2333-9721
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Nb对非晶态Fe-Co-Nd-B合金的晶化动力学的影响
, PP. 91-96
Keywords: 铁基非晶合金,晶化动力学,晶化激活能,局域Avrami指数
Abstract:
在Fe-Co-Nd-B非晶合金中添加4%的Nb(原子分数)可延迟其晶化过程,提高晶化温度,并使其热稳定性显著提高.Nb抑制Fe3B晶化相的形核,但促进Fe23B6相的形核及长大.Nb可使晶化相的平均晶粒尺寸从30-60nm减至14-20nm.Nb使由初始晶化温度计算的晶化激活能明显降低.Fe-Co-Nd-B合金中,α-Fe(Co),Fe3B和Nd2(Fe,Co)14B晶化相的形核过程要难于长大过程,而加Nb后α-Fe(Co),Fe23B6和Nd2(Fe,Co)14B晶化相的长大过程要难于形核过程,但Nb基本未改变晶化相的形核及长大机制.非晶合金的晶化主要是一维界面控制的形核以及形核率随时间减小的三维长大过程.
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