(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 采用X射線衍射反射法在角度(α)為0~75°時(shí)測量Al-Mg和Al-Mg-Sc合金板材經(jīng)不同退火溫度處理后的不完整極圖，應(yīng)用三維取向分布函數(shù)(ODF)以及晶粒取向匯集目標(biāo)線(α、β取向線)研究合金冷軋板材中織構(gòu)的形成及其在退火過程中的演變規(guī)律。結(jié)果表明：Al-Mg合金冷軋板材中主要存在Brass織構(gòu){011}á211ñ和Copper織構(gòu){112}á111ñ，退火溫度升高到300 ℃時(shí)，Al-Mg合金板材的形變織構(gòu)逐漸消失，Brass織構(gòu)和Copper織構(gòu)分別向立方織構(gòu){001}á100ñ以及旋轉(zhuǎn)立方織構(gòu){001}á110ñ轉(zhuǎn)變；添加Sc元素沒有改變Al-Mg合金板材冷軋織構(gòu)組分，但織構(gòu)極密度和取向密度明顯增強(qiáng)；退火溫度升高到450 ℃時(shí)，Al-Mg-Sc合金板材的部分Brass織構(gòu)和Copper織構(gòu)才向立方織構(gòu)和旋轉(zhuǎn)立方織構(gòu)轉(zhuǎn)變，表明Sc的加入使Al-Mg-Sc合金在退火過程的再結(jié)晶溫度顯著提高。
關(guān)鍵字: Al-Mg-Sc合金；織構(gòu)；退火；取向分布函數(shù)
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
