《Table 1 Rolling process parameters》

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《大应变交叉轧制对高Mg含量Al-Li合金板材组织和性能的影响（英文）》

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H0 and H1 are piece thickness values before and after rolling，respectively

Al-Li alloy cylindrical billet with high magnesium content by spray forming was prepared on the self-developed spray forming device SD380.The chemical composition of the alloy was Al-9.8Mg-1.5Li-0.4Mn（mass faction，%）.Through the 1250 t extruding machine，the cylindrical billet was extruded into the billet with the section size of 20 mm×100 mm，the extrusion temperature was 450°C，and the extrusion ratio was 15:1.After extrusion，the billet was sprayed immediately and cooled by water.The piece was cut from the billet，and its length，width and thickness were100，80 and 20 mm，respectively.Each piece was rolled three passes on the mill with a roll diameter of 350 mm，and the single pass reduction was not less than 50%.The intermediate annealing temperature was 380°C，and the piece was immediately immersed into the room temperature water after the completion of each pass rolling.Rolling process parameters are shown in Table 1.Let A represent the extrusion direction of the plate（0°），B represent 45°angle with the direction of extrusion and C represent 90°angle with the direction of extrusion.In this experiment，CBB，CCB and CBA three kinds of cross rolling methods were used to roll the extruded pieces under large deformation.