异步轧制速比对高纯铝箔织构转变的影响

Effect of speed ratio on textures transformation in cross shear rolled high purity aluminum foils

采用不同速比对高纯铝板进行异步冷轧,并将冷轧样品进行不同温度和时间的再结晶退火,研究异步轧制速比对高纯铝箔织构转变的影响。结果表明:高速比的异步轧制在样品中产生较强的旋转立方织构和{102}〈uvw〉织构,异步轧制退火后的高纯铝箔样品具有很强的立方织构{001}〈100〉。立方织构的体积分数与速比和温度有关:当速比为1.06时,温度升至300℃开始出现立方织构;当速比为1.17时,温度升到200℃就出现立方织构。立方织构组分的形成存在一个阈值温度,此温度与异步轧制的速比成反比,随着速比的增加,阈值温度逐渐降低,这与异步轧制提高高纯铝箔的形变储能有关。异步轧制有利于在低温时形成较强的立方{001}〈100〉织构。

Hot rolled high purity aluminum sheet was cold rolled by cross shear rolling with different roll mismatch speed ratio. Then, the specimens were annealed by different processes. The effects of speed ratio on texture transformation were analyzed. The results show that the strong rotated cube texture components {001} （110） and { 102 } （uvw） form and develop in high roll mismatch speed ratio cross shear rolling specimen, and there are strong cube textures in the annealed specimen. The volume fraction of the cube texture relates to the speed ratio and the temperature. When the temperature increases to 300 ℃ , the cube texture appears at the speed ratio of 1.06. When the temperature increases to 200 ℃, it appears at the speed ratio of 1.17. During the annealing of cross shear rolling specimen, there is a temperature threshold value for the formation and development of cube orientated grain, the value is inversely proportional to that of speed ratio. With the increase of the roll mismatch speed ratio, the threshold value decreases. The effects are attributed to an increase of deformation-stored energy. The cross shear rolling speeds up the nucleation and grain-growth of cube orientated grain at lower temperature.