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用原子力显微镜(AFM)观测了铁基合金(Fe73.5Cu1Nb3Si13.5B9)薄带断口的介观结构。通过对310℃退火样品的观测,可以发现薄带的贴辊面区(SRFA)和自由面区(FFA)存在着非常明显的结构差异;而540℃退火样品的AFM观测结果则显示这种差异并不明显。将310℃和540℃退火的样品在HF酸溶液中进行腐蚀,获得不同腐蚀深度的腐蚀表面,再用AFM观测其表面形貌,则发现:在310℃退火样品的腐蚀表面,自由面和贴辊面形貌各自随腐蚀深度的变化而变化,并且两表面形貌之间在腐蚀前期有差异,但后期无明显不同;而540℃退火样品的两个腐蚀表面,则不存在这样的变化和差异。该观测结果与薄带断口观测到的介观结构相符合。造成这种结构差异的原因是经不同温度退火后,薄带内部残留的内应力不同。
The mesoscopic structure of the Fe-based alloy (Fe73.5Cu1Nb3Si13.5B9) ribbon fracture was observed by atomic force microscopy (AFM). By observing the samples annealed at 310 ℃, there is a very obvious structural difference between the SRFS and the FFA of the ribbons. However, the AFM results of the samples annealed at 540 ℃ show the difference Not obvious. The samples annealed at 310 ℃ and 540 ℃ were etched in HF acid solution to obtain the corrosion surfaces with different corrosion depths. The surface morphology was observed by AFM. The corrosion surface, Roller topography changes with the depth of corrosion, and there is difference between the two surface topography in the early stage of corrosion, but there is no obvious difference in the later stage. However, there is no such change in the two corrosion surfaces of the annealed sample at 540 ℃ and difference. The observation is consistent with the observed mesoscopic structure of the band fracture. The reason for this structural difference is that after annealing at different temperatures, the internal residual stresses in the ribbons are different.