6061铝合金ECAP变形后退火组织稳定性和织构变化  

Microstructure and texture change in equal channel angularpressed 6061 aluminum sheet by static annealing

作　　者：覃继宁[1] 张荻[1] 张国定[1] J.C.Lee 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200030 [2]Division of Materials Science and Engineering,Korea University, Anam, Seoul 136-701, Korea

出　　处：《中国有色金属学报》2005年第4期519-523,共5页The Chinese Journal of Nonferrous Metals

基　　金：基金项目: 韩国科学技术评估院 (KISTEP);上海市科学技术委员会重大基础研究资助项目(04DZ14002)

摘　　要：采用一种基于等通道角挤压(ECAP)变形模式的全新的方法———DCAP 方法, 对6061 板料进行了DCAP变形, 并利用透射电镜和X射线衍射对6061 铝合金DCAP变形后的退火组织和织构进行了研究。结果表明: 材料经DCAP变形退火后的晶粒在330℃左右仍能保持较细的晶粒度, 晶粒大小约为0 6μm; 与轧制过程中通常出现的立方织构不同, DCAP退火后的主要再结晶织构为旋转立方织构{001}〈110〉, 并伴有{111}〈110〉次要织构分量; 退火时旋转立方织构表现出的强烈的择优生长趋势, 是其成为DCAP变形后主要再结晶织构的原因。A novel equal channel angular pressing(ECAP) based process called dissimilar channel angular pressing(DCAP) was conducted to 6061 aluminum. The samples after DCAP were annealed isochronally up to 330℃, and the microstructural change and the texture evolution were investigated by means of TEM and three-dimensional orientation distribution functions (ODFs), which were determined by X-ray diffraction. The results show that the ultrafine grains induced by DCAP are quite stable, remaining in size of 0.6μm up to the annealing temperature of 330℃. The macrotexture after annealing is characterized by two components: {111}〈110〉 component and a very sharp rotated cube texture component in place of the cube component, which generally appears to be the dominant component in rolling deformation. The occurrence of preferential growth of rotated cube grains may give rise to the strong intensity of rotated cube orientation in recrystallized texture.

关 键 词：铝合金 等通道角挤压 再结晶 织构 

分 类 号：TG376[金属学及工艺—金属压力加工] TG379