The effects of homogenization annealing processes on twin-roll casting (TRC) Al-Mg-Si plates have been studied, the transformation of β-AlFeSi phase to α-AlFeMnSi phase and the recrystallization behavior have been discussed, and the uniformity of the plate has been evaluated. The results show that the hardness from the surface to the center is wildly fluctuating in the TRC plate, the recrystallization level and the morphology of second phases are different between the surface and the center. It indicates that the uniformity of TRC plate needs to improve. After the homogenization annealing process, the uniformity of the plate improves observably. When the homogenization annealing process is 540°C×7 h, the microstructure and properties of TRC Al-Mg-Si plate are uniform, the hardness from the surface to the center fluctuates smoothly, coarse lamellar β-AlFeSi phases have basically transformed into spherical α-AlFeMnSi phase, recrystallization level in the surface is in consistent with that in the center basically. As homogenization annealing temperature rises, the hardness from the surface to the center starts to fluctuate unsteadily. It is concluded that spherical α-AlFeMnSi phases initiate to coarsen, resulting in obvious fluctuations of Mg, Si and Fe elements. the recrystallization levels of the surface and the center are approximate when the process is 560°C×7 h, but the grains have significantly coarsened.

中文翻译：

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均匀化退火对双辊铸造Al-Mg-Si板组织演变及均匀性的影响


研究了均匀化退火工艺对双辊铸造（TRC）Al-Mg-Si板的影响，讨论了β-AlFeSi相向α-AlFeMnSi相的转变和再结晶行为，并对板的均匀性进行了研究。已被评估。结果表明，TRC板从表面到中心的硬度波动较大，表面和中心的再结晶程度和第二相形貌存在差异。这表明TRC板的均匀性有待提高。经过均匀化退火处理后，板材的均匀性明显提高。当均匀化退火工艺为540℃×7 h时，TRC Al-Mg-Si板的组织和性能均匀，硬度从表面到中心波动平稳，粗大片状β-AlFeSi相基本转变成球状。 α-AlFeMnSi相，表面再结晶程度与中心基本一致。随着均匀化退火温度的升高，从表面到中心的硬度开始不稳定波动。结果表明，球状α-AlFeMnSi相开始粗化，导致Mg、Si和Fe元素出现明显波动。 560℃×7 h时，表面和心部的再结晶程度相当，但晶粒明显粗化。