某铝合金箔在生产过程中发生断带，采用宏观观察、化学成分分析、金相检验、扫描电镜和能谱分析等方法对其断带原因进行分析。结果表明：在铝合金箔的厚度较小时，夹杂物影响了轧制过程中的金属流动，形成了孔洞和裂纹，裂纹扩展导致铝合金箔发生断带。

The fracture of an aluminum alloy foil occurred during the production process. The fracture reasons were analyzed by means of macroscopic observation, chemical composition analysis, metallographic examination, scanning electron microscopy and energy spectrum analysis. The results show that when the thickness of the aluminum alloy foil was small, the inclusions affected the metal flow during the rolling process, forming holes and cracks. The crack propagation caused the aluminum alloy foil to break.