5B70铝合金大规格锻环不同位置的显微组织和位错密度  

Microstructure and dislocation density evolution in different positions of large-size 5B70 aluminum alloy forged ring

作　　者：吴飞飞 姜锋 路丽英[2,3] 蒋靖宇 范福送[1] 龙梦君 WU Fei-fei;JIANG Feng;LU Li-ying;JIANG Jing-yu;FAN Fu-song;LONG Meng-jun(Light Alloy Research Institute,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;Northeast Light Alloy Co.,Ltd.,Harbin 150060,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学材料科学与工程学院,湖南长沙410083 [3]东北轻合金有限责任公司,黑龙江哈尔滨150060

出　　处：《轻合金加工技术》2022年第2期55-61,67,共8页Light Alloy Fabrication Technology

摘　　要：通过背散射电子衍射技术(EBSD)和透射电子显微镜(TEM)研究了中温变形对5B70铝合金锻环不同位置显微组织和位错密度的影响。结果表明:锻环的显微组织从内至外呈现梯度变化,晶粒尺寸逐渐减小,晶界处出现大量亚晶粒,锻环内层的动态回复效果比外层的更充分。纳米级的次生Al_(3)(Sc,Zr)粒子与位错交互作用失去共格效应。通过核内平均取向差(KAM)图看出,从锻环的内层至外层,亚结构数量明显增加。利用KAM数据计算位错密度,位错密度变化趋势与亚结构变化趋势一致。The effects of warm deformation conditions on microstructure and dislocation density in different positions of 5B70 aluminum alloy forged ring were studied by electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM)。The results show that the microstructure of the forging ring exhibits a gradient variation from inside to outside,and the grain size decreases gradually,accompanied by a large number of subgrains appearing at the grain boundary.The dynamic recovery effect of the inner layer of the forging ring is more sufficient than that of the outer layer.The interaction between the nano-scale secondary Al3(Sc,Zr)particles and the dislocations lead to incoherence.The Kernel Average Misorientation(KAM)diagram shows that the number of substructures increases significantly from the inner layer to the outer layer of the forged ring.The dislocation density was calculated with KAM data.The variation trend of dislocation density is consistent with that of substructure.

关 键 词：5B70铝合金 锻环 显微组织 Al_(3)Sc粒子 位错密度 

分 类 号：TG319[金属学及工艺—金属压力加工]