(中南大学 材料科学与工程学院,长沙 410083)
摘 要: 采用X射线衍射反射法在角度(α)为0~75°时测量Al-Mg和Al-Mg-Sc合金板材经不同退火温度处理后的不完整极图,应用三维取向分布函数(ODF)以及晶粒取向汇集目标线(α、β取向线)研究合金冷轧板材中织构的形成及其在退火过程中的演变规律。结果表明:Al-Mg合金冷轧板材中主要存在Brass织构{011}á211ñ和Copper织构{112}á111ñ,退火温度升高到300 ℃时,Al-Mg合金板材的形变织构逐渐消失,Brass织构和Copper织构分别向立方织构{001}á100ñ以及旋转立方织构{001}á110ñ转变;添加Sc元素没有改变Al-Mg合金板材冷轧织构组分,但织构极密度和取向密度明显增强;退火温度升高到450 ℃时,Al-Mg-Sc合金板材的部分Brass织构和Copper织构才向立方织构和旋转立方织构转变,表明Sc的加入使Al-Mg-Sc合金在退火过程的再结晶温度显著提高。
关键字: Al-Mg-Sc合金;织构;退火;取向分布函数
annealing at different temperatures
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract:The uncompleted pole figures of Al-Mg and Al-Mg-Sc alloy sheets after annealing at different temperatures were measured by X-ray diffractometry at angle (α) from 0° to 75°. The texture compositions and their evolution law were analyzed by the orientation distribution functions(ODF) and the collection of grain orientation (α and β fibre). The results indicate that the brass {011}á211ñ and copper {112}á111ñ textures are primary in Al-Mg alloy cold-rolled sheets. When the annealing temperature increases to 300 ℃, the deformed textures disappear gradually, the brass and copper textures translate into cube and cube-rotation textures, respectively. Sc element addition can not change the texture compositions of Al-Mg alloy cold-rolled sheets, but it makes the pole and orientation densities increase significantly. For Al-Mg-Sc alloy sheet, the texture translations occur until the annealing temperature rises to 450 ℃, partial brass and copper textures change into the cube and cube-rotation textures, which indicates that Sc element addition would evidently enhance the recrystallization temperature of Al-Mg-Sc alloy in the annealing process.
Key words: Al-Mg-Sc alloy; texture; annealing; orientation distribution function