Fe80Si9B11非晶合金薄带热膨胀特性和结构弛豫分析

提出了采用推杆式热膨胀仪测试非晶合金薄带热膨胀特性的新方法。分析了Fe80Si9B11非晶薄带的热膨胀曲特性和非晶合金晶化过程。根据R．G．Zheng理论分析了结构弛豫中自由体积比变化，发现自由体积比曲线出现双峰。结合晶化前发生相分离的理论分析了这种变化的原因。分析表明：铁基非晶Fe80Si9B11晶化过程中先形成a—Fe（Si）相，再析出FesB、二次a—Fe（Si）相。晶化前先发生相分离，自由体积比增大，然后析出结晶相a—Fe（si），自由体积比降低。随温度升高，B偏聚，自由体积比增大，随后析出Fe3B、二次a—Fe（Si）相，自由体积比降低。

Thermal Expansion Properties and Relaxation of Fe80Si9B11 Amorphous Alloy Ribbon

To understand the structure relaxation of Fe80Si9B11 amorphous alloy, a new method to measure the ther- mal expansion properties of amorphous alloy ribbon with push-bar thermal dilatometer was applied. The free-volume fraction during crystallization was analyzed according to the change of linear expansion coefficients. The free-volume fraction curves showed two peaks. It was analyzed by phase disengagement theory. It is concluded that a-Fe（Si） phase crystallizes firstly and then Fe3B and secondary a-Fe（Si） phase crystallize. During relaxation, phase disen- gagement appears firstly before crystallization with free-volume increasing, then a-Fe（Si） crystallizes with free-vol- ume decreasing. At higher temperature, B partially polymerizes with free-volume increasing, and then Fe3 B and sec- ondary a-Fe（Si） crystallize with free-volume decreasing.