Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第8期    总第77期    2005年8月

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文章编号:1004-0609(2005)08-1173-06
冷轧高纯铝柱状晶粒的组织与微取向的不均匀性
邓运来, 张新明, 刘 瑛, 唐建国, 周卓平

(中南大学 材料科学与工程学院, 长沙 410083)

摘 要:  采用光学显微术与SEM-EBSD技术观测了经65%压下量冷轧后高纯铝多晶体中不同取向柱状晶粒的微观组织与微取向图。 结果表明: 形变晶粒各部分具有不同的转动趋势, 靠近晶界部分(BP)的转动角度小于远离晶界部分(IP)的; 〈001〉//RD取向的晶粒向α-取向线聚集, 其BP与IP部分的转动角度相差5°~6°;〈121〉//ND取向的晶粒向β-取向线聚集, 其BP和IP部分的转动角度相差5°~12°; 这表明轧制变形晶粒各部分的微观组织与微取向分布与其初始取向和所处位置有关。

 

关键词:  高纯铝; 冷轧; 微观组织; 局部取向; 背散射电子衍射

Inhomogeneities of microstructures and micro-orientations in cold-rolled high purity
Al columnar grains
DENG Yun-lai, ZHANG Xin-ming, LIU Ying, TANG Jian-guo,
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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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