Ultrasonic-assisted twin-roll casting (UA-TRC) process was developed for the production of high quality 1050 aluminum alloy strip with minimum casting defects. Results of industrial-scale trials show that the strips obtained by UA-TRC exhibited a homogenized matrix composed of fine equiaxed grains. Meanwhile, robust evidence substantiates the feasibility of eliminating edge cracks and centerline segregation of the strips via the ultrasonic melt treatment. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) techniques were utilized to clarify the cause of edge cracks and centerline segregation, and furthermore, the regime of elimination of such defects via ultrasonic treatment in TRC processing. The results of present study reveal that by introduction of ultrasonic prior to rolling, homogeneity of solute elements and fluidity of the melt can be enhanced. As a result, the production of non-cracked strips with homogenized matrix is promised.

开发了超声波辅助双辊铸造（UA-TRC）工艺，以生产具有最小铸造缺陷的高质量1050铝合金带材。工业规模试验的结果表明，通过UA-TRC获得的带材表现出由细等轴晶粒组成的均质基体。同时，有力的证据证实了通过超声熔融处理消除带材的边缘裂纹和中心线偏析的可行性。利用扫描电子显微镜（SEM）和电子反向散射衍射（EBSD）技术来澄清边缘裂纹和中心线偏析的原因，并进一步阐明在TRC加工中通过超声处理消除此类缺陷的机制。本研究的结果表明，通过在轧制之前引入超声波，可以提高溶质元素的均质性和熔体的流动性。结果，有望生产出具有均质基体的无裂纹带材。