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熔体温度是影响铝箔坯料质量的关键因素之一。采用铸轧法制备了7.0 mm厚的1235超薄双零铝箔坯料,借助光学显微镜(OM)、扫描电子显微镜(SEM)、定量金相分析技术和电解抛光等测试方法,研究了熔体温度处理对铸轧1235超薄双零铝箔用坯料组织的影响,并对其影响机理进行了分析和探讨。结果表明:熔体温度偏高,容易消除异质形核核心,造成铝箔坯料晶粒组织粗大。采用向电解铝液中加入10%~30%的重熔用铝锭,可以降低熔体温度,增加异质结晶核心,有利于增大熔体凝固过冷度,减小临界晶核半径,促进坯料晶粒细化。加入30%的重熔用铝锭,铸轧板组织晶粒更均匀细小,其晶粒平均尺寸约为67μm。
Melt temperature is one of the key factors affecting the quality of aluminum foil billet. The thickness of 7.0 mm thick 1235 thin double zero aluminum foil was prepared by the casting method. The effects of melt temperature treatment (OMT), microstructure and mechanical properties The influence on the microstructure of the 1235 ultra-thin double zero aluminum foil in the roll casting was analyzed and discussed. The results show that the melt temperature is high, and the heterogeneous nucleation is easily eliminated, resulting in the coarse grain structure of the aluminum foil blank. Addition of 10% ~ 30% remelting aluminum ingot to the electrolytic aluminum liquid can decrease the melt temperature and increase the heterogeneous crystal nucleus, which is beneficial to increase the degree of solidification under cooling, decrease the critical nucleus radius, and promote Billet grain refinement. Adding 30% remelting aluminum ingot, casting plate microstructure and more fine grains, the average grain size of about 67μm.