Fe83B17非品薄带冷却速率的量化与表征

为定量计算非晶薄带的冷却速率，文中采用单辊快速凝固方法成功制备出Fe83B17非晶薄带．结合X-射线衍射图谱分析了转速与压差对非晶形成的影响，确定形成Fe83B17非晶薄带的临界转速饥为3300r／min，临界压差P，为0．023MPa，临界带厚为36μm．通过熔体结晶转变动力学理论计算，得出了Fe83B17合金熔体结晶的TTT曲线，确定出形成Fe83B17合金非晶薄带的冷却速率约为106K／s．应用单辊快速凝固过程的一维傅里叶传热方程分析，定量计算出临界厚度为36μm薄带的冷却速率为3．411×106K／s，该值与动力学理论预测结果相一致．

The Cooling Rate Quantification and Characterization of Fe83B17 Amorphous Ribbon

Fe83B17amorphous ribbons were prepared successfully by melt-spinning method. In combination with the XRD profile, the effect of rotational speed and injection pressure on the formation of amorphous ribbon was analyzed. On this basis, the critical speed, the critical pressure and the critical thickness for forming the amorphous ribbons were determined as 3300 r/min, 0. 023 MPa and 36 μm respectively. Applying the classical solid-state transformation kinetics, the Temperature-Time- Transformation （TTT） diagram of Fe83B17 alloy was given, by which the critical cooling rate for the formation of the amorphous ribbons was determined as about 106 K/s. Applying one-dimensional Fourier heat transfer equation, the cooling rate upon forming a ribbon with the thickness of 36 μm was calculated as 3. 411× 106 K/s, which is consistent with the result from the TTT analysis. The current work can be considered as the theoretical basis and technical support for the subsequent preparation of amorphous ribbons.