Laser-induced local crystallization in Finemet-type alloy was studied using X-ray diffraction, SEM and EDX methods. For investigated conditions of irradiation (wavelength λ = 1.06 µm, laser power density 50 W/cm²), it was found that primary crystallization starts with the formation of the nanocrystalline α-Fe(Si) solid solution at shorter exposure time and the second step crystallization with the nanocrystalline hexagonal H-phase formation occurs in longer exposure time. Changes in the local element concentration were observed at the surface of the irradiated zone and at the ribbon fracture. It was shown that the nonlinear temperature field due to the laser irradiation resulted in changes of the local elements concentration and this feature changed crystallization mechanism of the Finemet-type alloy.

中文翻译：

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Fe73.5Nb3Cu1Si15.5B7非晶带在激光加热下的纳米晶化和相形成

使用X射线衍射，SEM和EDX方法研究了Finemet型合金中激光诱导的局部结晶。对于研究的辐照条件（波长λ= 1.06 µm，激光功率密度50 W / cm ²），发现一次结晶始于在较短的曝光时间下形成纳米晶α-Fe（Si）固溶体，第二次结晶开始。在更长的曝光时间内会发生具有纳米晶六角形H相形成的分步结晶。在辐照区的表面和碳带断裂处观察到局部元素浓度的变化。结果表明，激光辐照引起的非线性温度场导致了局部元素浓度的变化，这一特征改变了Finemet型合金的晶化机理。