【作者】 黄涛；

【导师】 王福；

【作者基本信息】 东北大学 ， 材料学， 2006， 博士

【摘要】 高纯铝箔是制作高压电容器的关键材料，具有立方取向的晶粒在腐蚀过程中形成隧道蚀坑，有利于获得高的比电容，因此高纯铝箔高的立方织构含量，是获得高比电容的前提条件。长期以来材料科学工作者不断地致力于高纯铝箔微取向流变行为的研究，尤其是最近几年在这一领域取得了很大的进展，但这些成果大都是在同步轧制条件下取得的。本文在异步轧制条件下对高纯铝箔微取向流变行为进行了研究，以期获得高的立方织构含量。 本文选用西南铝厂提供的高纯铝板，对其进行不同速比，不同形变量的冷轧，再进行不同工艺制度的退火。采用X射线衍射术测定样品宏观织构，借助透射电子显微镜进行显微组织观察，利用电子背散射衍射技术进行微区织构分析，结合各部分实验结果，讨论了不同工艺参数对异步轧制高纯铝箔织构和显微组织的影响。通过分析高纯铝箔冷轧后退火的再结晶初期，立方取向晶核的形成过程及立方取向晶粒的长大行为，探讨了高纯铝箔立方织构形成的规律，以求更加系统地控制高纯铝箔立方织构的形成和发展。 研究表明：异步轧制与同步轧制的冷轧织构有较大差异。高纯铝箔在异步轧制下慢辊和快辊两侧的织构类型明显不同，尤其是旋转立方织构{001}<110>的含量上的差异更大，快辊侧随形变量的增加冷轧织构主要为S织构{123}<634>和{102}<uvw>织构；而慢辊侧则主要为C织构{112}<111>和旋转立方织构{001}<110>。在异步轧制下，快、慢速辊侧之间的各中间层的织构类型也各有不同。 退火再结晶织构在快、慢辊侧的差异减小，织构类型趋于一致。 异步轧制参数对冷轧和再结晶织构有显著的影响。在速比1.17或形变量98.7％处，冷轧织构明显变化。形变量为98.7％的样品，在500℃退火2h，立方织构体积分数随速比近线性增加，形变量大于98.7％时，立方织构含量明显降低。 退火温度和保温时间对异步轧制高纯铝箔的立方织构有较大的影响。形变量为96.7％～98.7％的样品，经500℃～600℃保温2h退火，可得强的立方织构。形变量为99.2％的样品，需经600℃保温2h～3h退火，能获得强的立方织构。低温预回复对不同速比、形变量样品有不同的影响，但对形变量99.2％样品影响最显著。经三段式600℃等温退火，促进了速比1.17、形变量99.2％样品立方织构的形成和发展。 异步轧制高纯铝箔在退火过程中，立方织构的形成存在一个阈值温度，该温度与异步轧制速比成反比。 异步轧制的作用可导致剪切带，在剪切带所包括的区域内集中了非常高的局部塑性变形，提高了高纯铝箔的形变储能，可以提供良好的形核和长大条件。立方亚晶优先在C取向形变基体内形核并长大，定向形核机制为主要因素。{001}<110>和{102}<uvw>更多还原

【Abstract】 High purity aluminum foils are the key raw materials of high voltage electrolytic capacitors. Since the aluminum foils for high voltage anode materials were subjected to DC electrochemical etching, tunnel growth of etch pits with the <100>crystallographic grain during corrosion were achieved, which were required for high capacitance, thus the large volume fraction of cube texture in the aluminum foils is the prerequisite to obtain high capacitance. To obtain the stronger cube texture {001}<100>, the researches on texture formation in the high purity aluminum foils have been done for a long time and a lot of great progress in this field has been made especially in recent years. However all of the achievements are obtained under the condition of symmetrical rolling. In this thesis, the behavior of micro-orientation flow of high purity aluminum foils by cross shear rolling was studied in order to obtain the strongest cube texture.In this thesis, the high purity aluminum sheet provided by Southwestern Aluminum Manufacture Factory was cold rolled and subsequent annealed by different technological methods. The X-ray texture analysis were performed for various specimens, the microstructures of some specimens were observed with transmission electron microscope, microtextures analysis was performed by EBSD, combining the results of different parts, the effects of several technological parameters on the textures and microstructures of the high purity aluminum foils by cross shear rolling were then discussed to some extent. The nucleation and growth behaviors of cube orientation grains during the early stage of recrystallization annealing after cold rolling were discussed, so that the formation and development of cube texture in high purity aluminum foils can be controlled more systematically.The research results show that there is a great difference in cold rolling texture between cross shear rolling and the symmetric rolling. Under the condition of cross shear rolling, the textures formed near slow roller side and fast roller side were obviously different, especially in the content of the rotation-cube texture {001}<110>. With the increase of reduction near fast roller side, the cold rolling textures were mainly S {123}<634>and {102}<uvw>. However, the cold rolling textures near slow roller side were mainly C {112}<111> and {001}<110> rotation-cube texture. In addition, the deformed texture distribution in high更多还原