(中南大學 材料科學與工程學院， 長沙 410083)
摘 要: 采用光學顯微術(shù)與SEM-EBSD技術(shù)觀測了經(jīng)65%壓下量冷軋后高純鋁多晶體中不同取向柱狀晶粒的微觀組織與微取向圖。 結(jié)果表明： 形變晶粒各部分具有不同的轉(zhuǎn)動趨勢， 靠近晶界部分（BP）的轉(zhuǎn)動角度小于遠離晶界部分（IP）的； 〈001〉//RD取向的晶粒向α-取向線聚集， 其BP與IP部分的轉(zhuǎn)動角度相差5°~6°；〈121〉//ND取向的晶粒向β-取向線聚集， 其BP和IP部分的轉(zhuǎn)動角度相差5°~12°； 這表明軋制變形晶粒各部分的微觀組織與微取向分布與其初始取向和所處位置有關(guān)。
關(guān)鍵字: 高純鋁； 冷軋； 微觀組織； 局部取向； 背散射電子衍射
Al columnar grains
ZHOU Zhuo-ping
（ School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: Deformation microstructures and micro-orientations in columnar grains with different orientations in a polycrystalline high purity Al cold-rolled up to 65% (thickness reduction) were investigated by optical microscopy (OM) and SEM-EBSD techniques. It is found that rotations are inhomogeneous within the individual grains, the rotation angles of the parts close to the initial boundaries (BP) are smaller than those remote from the boundaries (IP), as the deviation angles between the BP and IP are 5°-6° in the grains with 〈001〉//RD orientation leading to the rotation along the α-fiber, while the deviation angles are 5°-12° in the grains with 〈121〉//ND orientation rotating toward the β-fiber. These results demonstrate that the microstructures and local rotations of various parts within the rolled individual columnar grains are influenced by their initial orientations and localities.
Key words: high purity Al; cold rolling; microstructures; local orientations; EBSD
