1235铝合金连续铸轧态微观组织的表征Characterization of microstructure of 1235 aluminum alloy sheet produced by twin roll casting

采用连续铸轧方法制备6 mm厚、牌号为1235的铝合金，利用高分辨透射电镜(TEM)、扫描电镜(SEM)和背散射电子衍射技术(EBSD)对铸轧态(TRC)样品的微观结构进行表征。结果表明：铸轧态的1235铝合金具有快速凝固组织，即晶粒尺寸在30~100 nm之间的纳米多晶组织，有沿( )晶面滑移的滑移带和高密度位错线等深度塑性变形组织，还有沿(100)晶面生长的再结晶组织；Fe和Si等掺杂元素固溶在基体Al中；在铸轧态下晶粒直径几乎分布在20~50 μm之间，且产生的较强织构有{210}á122？、{122}á210？和{210}á125？等，较弱的织构有铜织构{112}á111？和{112}á110？。

The microstructures of 6 mm-thick 1235 aluminum alloy sheets produced by twin roll casting (TRC) were investigated by high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and backscattered electron diffractometry (EBSD). The results show that there are rapidly solidified microstructures with nano-polycrystalline grains ranging in 30-100 nm, severe plastic deformation structures sliding bands along ( ) direction, high density dislocation lines and recrystallized microstructures growing along (100) direction in the sheets. Additive elements, such as Fe and Si, exist in Al solid solution. In casting state, grain diameter almost evenly distributes in 20-50 μm; in the sheets produced by TRC, there are dominating textures, such as {210}á122？, {122}á210？ and {210}á125？, and secondary textures, such as copper texture {112}á111？ and {112}á110？ .

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