(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 采用取向分布函数(ODF)和背散射电子衍射技术(EBSD)研究冷轧和退火对2E12铝合金织构的影响，并采用透射电镜(TEM)分析亚结构在冷轧与退火过程的演变规律。结果表明：2E12合金热轧板在冷变形过程中，随着冷轧变形量从40%增加到80%，黄铜织构(Brass){011}á211？和S型织构{123}á634？逐渐增多，立方织构(Cube){001}á100？明显减少。在退火过程中残留的立方取向亚晶通过晶界迁移吞噬周围的S取向亚晶而优先长大。在470℃退火0.5h后，立方织构(Cube){001}á100？成为主要取向，其体积分数为36%。在相同的退火工艺条件下，随着冷变形量的增加，退火后2E12合金的立方织构体积分数增大。
关键字: 2E12铝合金；冷轧；退火；织构；亚结构
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The effects of cold rolling and annealing on textures of 2E12 aluminum alloy were investigated by means of orientation distribution function (ODF) and electron backscattered diffraction (EBSD). In addition, the evolution of substructure during cold rolling and annealing was analyzed by TEM. The results show that, with the increase of the deformation from 40% to 80%, main conclusions are presented as follow: Brass texture{011}á112？ and S texture {123}á634？ increase during the cold rolling, while cube texture {001}á100？ significantly reduces. In the annealing process, the residual cube sub-grains devour surrounding sub-grains of S orientation through the grain boundary migration and preferentially grow up. The cubic texture becomes major orientation and its volume fraction is 36% at 470 ℃ for 0.5 h. Under the same annealing process conditions, the volume fraction of recrystallization texture in the annealing alloy increases with the increase of the deformation.
Key words: 2E12 aluminum alloy; cold rolling; annealing; texture; substructure
